Parker Hannifin Corp., Instrumentation Valve Div.

United States

These valves are a series of three- or four-way electrohydraulic servovalves (EHSVs) commonly used to control position, velocity, and force in a variety of hydraulic system, fuel system, and engine control applications. Driving aerospace hydraulic actuators or motors in closed-loop servosystems, the EHSVs provide flows to 10 GPM at 1000 psi drop across the valve. The first stage is driven by an efficient force motor that is balanced so that lateral accelerations have little effect on output flow.The electrohydraulic servovalves provide unparalleled performance due to the highly reliable jet-pipe first-stage and large second-stage spool design. The result is an exceptionally contamination-resistant, erosion-tolerant, and high-flow servovalve that's designed to last. With an ability to perform in a contaminated environment, the Parker EHSV allows particles as large as 208 microns (0.008") to pass through the first stage without difficulty. Because the first-stage fluid impinges on a receiver that is fixed to the second stage, the Jet-Pipe motor has low first-stage noise. The integrity of the projector jet stream results in optimum hydraulic efficiency (first-stage pressureflow recovery) and better dynamic performance at low fluid temperatures. The motor armature is mechanically supported and balanced in all three axes, reducing the effects of vibration up to 2000 Hz as compared to our competitions designs. Welded construction results in lower null shifts throughout temperature, pressure, and vibration extremes. The JetPipe design has an excellent first-stage pressure recovery, over 75 percent and typically approaching 85 percent of supply pressure, giving large second-stage chip shearing capabilities. Very high first-stage pressure gains, typically over 124 barsmA (for 8-mA-rated current and 206-bars supply pressure) are realized due to the JetPipe design, resulting in excellent threshold characteristics. Erosion effects on the receiver dam do not increase quiescent leakage or significantly reduce the pressure-recovery capability of the first stage, assuring minimal reductions in first-stage performance. The torque motor area is dry, which protects the magnetic portion of the torque motor from contamination. Parker Aerospace Jet-Pipe servo technology offers proven, unsurpassed reliability and control that will operate in extreme environments. Our EHSV products are flying on most of the leading commercial and military aircraft in service today. OPTIONAL FEATURES:Passes 200 or 500 micron through both stagesHysteresis four or five percent maximum for input signalsFirst-stage screen of 90 or 2500 micronsConsistent dynamics up to 25 or 50 percent of full flow Features of the model 410 servovalveReliability The model 410 Jet-Pipe servovalve has a single inlet first stage, making it a fail-to-center design. There is no risk of unbalance from contamination because there is only a single source of fluid for the first stage. Our second-stage spool design is capable of generating more than 100 pounds of chip shear force (with a nominal 3, 000 psi system). Contamination resistance Unique jet construction enables most designs to receive and pass particles as large as 200 microns without malfunction. Low sensitivity to vibration and shock First stage is balanced and supported along all three axes against the effects of lateral acceleration and vibration. Acceleration and vibration tests show almost no effect on load output from 0 to 3000 Hz. Stability The high-velocity, first-stage jet flow impinges onto a rigid receiver, solidly mounted in the second stage, and does not impinge on the mechanical feedback element. The rigid connection of the mechanical feedback element to the second-stage spool eliminates a wear point and reduces high gain at null. Null bias stability Through symmetrical torque motor design and all weldedbrazed construction, null shift resulting from vibration, temperature, and other environmental factors is minimized. Low maintenance No filter replacements are required. First-stage oil passes through a single 90-micron screen that is easily removable for inspection without disassembling the valve. Servo-controlled second stage The second-stage spool is precisely controlled by a high-gain, position-feedback servo-loop. Pressure balance and high force gain of the hydraulic first stage prevents displacement of the second-stage piston caused by any unexpected disturbance. Wide dynamic range Characteristics of phase and amplitude versus frequency are virtually the same for inputs ranging from a few percent points to 50 percent of full flow. Dry torque motor The hermetically sealed torque motor is completely isolated from the hydraulic fluid. Reduced life cycle cost The Jet-Pipe servovalves rugged construction and unique design result in an overall lower life-cycle cost as well as unsurpassed reliability when compared to other designs. Certified for use in hazardous locations Non-incendive protection: class1, division 2, groups A, B, C, D - T135Certification: NI 1 2 ABCD T3C Ta=135C Features of the model 415 servovalvePasses 200-micron particles Unique jet construction enables model 415 to receive and pass particles as large as 200 microns through both stages without malfunction. No unbalance from oil contamination Because there is only one source of oil in the first stage, the valve will not become unbalanced or produce false hard over signals due to oil contamination of that stage. Low hysteresis Hysteresis is normally less than three percent of rated current for all input signals (four percent maximum). Low threshold Normally less than 0.1 percent of rated current (0.25 percent maximum). No filters First-stage oil passes through a single 90-micron screen easily removable for inspection without disassembling the valve. Low temperature drift Maximum null shift resulting from oil or environmental temperature changes is held to approximately two percent for each 100F through symmetrical torque motor design. Servo-controlled second stage Second-stage piston is precisely controlled by a high-gain, null-balance, and force-feedback servo. Pressure balance of the hydraulic preamplifier prevents displacement of the second-stage piston due to variations in supply or return oil pressure.

Parker Stratoflex high-pressure swivel joints provide key functionality and reliability when rotation is required in a fluid or pneumatic conveyance systems. Designed with precision-made bearings for smooth movement and reduced torque, and qualified at over 100, 000 swivel cycles, Parker Stratoflex swivel joints are the ideal solution for rotating conveyance systems. Full 360-degree rotation with low torque at full system pressure prevents hydraulic system flex hoses and rigid tubes from potential damage due to twisting, binding, or kinking. The protection is beneficial both during installation and operation in critical areas, including landing gear and cargo door actuation. Engineered and tested to meet or exceed military standards, Parker Stratoflex swivel joints are built for long life in the harshest conditions. Combined with Parker Stratoflexs leading hose and tube assemblies, and innovative coupling designs, high-pressure swivel joints from Parker Stratoflex ensure your aerospace fluid conveyance system is performing with proven reliability. Consult Parker Stratoflex Division for specific size, configurations, and availability to meet your system requirements. APPLICATIONS: Parker Stratoflex high-pressure swivel joints are designed for applications where rotation between fluid or pneumatic conveyance lines is required. This includes applications such as retractable landing gears, cargo door actuators, and any pivoting pressure line. Applicable fluid systems include MIL-H-83282, Skydrol hydraulic systems, liquid cooling, and fuel lines. FEATURES AND ATTRIBUTES: Highly-reliable rotation while under pressure to provide functionality to pivoting fluid conveyance systemsSmooth ball bearing operation for long life and reduced torqueQualified at over 100, 000 swivel cycles with side load to ensure reliabilityMinimal pressure loss at rated flow based on optimized flow-path designLow torque for rotation at system pressureDust seal prevents dirt and grit contamination for optimum service lifeFitting styles include flared, flareless, and beam seal endsAvailable in titanium and stainless steel (CRES) options

Fuel check baffle valves are installed onto the ribs of the aircraft wing. With its low pressure drop, low leakage rate, and lightweight design, this valve is an ideal choice when properly selected for the right application. The fuel check baffle valve has an elegantly simple design, yet is extremely reliable and several variations of this check valve have been produced by Parker for over 30 years. To facilitate inboard fuel movement, a number of check valves are installed along the ribs that form the boundaries between these compartments. These are known as baffle check valves or flapper check valves. The material and finishes used in the construction of the baffle check valve, and those of similar and previously qualified valves, are unaffected by several environmental conditions listed in RTCA DO-160 and MIL-STD-810. APPLICATIONS: Commercial aircraft, military fighters and transports, business and general aviation. FEATURES AND ATTRIBUTES: Fundamental features of the baffle check valve include the following:Certified to withstand high vibration levels and demanding engine blade out requirementsLess than 0.1 lbsVery high mean time before failures (MTBF)Nitrile seal designed to handle several commonly used fluidsExcellent pressure-drop characteristics Rated for more than one million endurance cycles

Proven lifesavers, Stratoflex breakaway valves separate under high loads on fluid lines exceeding a predetermined value. Upon separation, the valves automatically seal the fluids in the lines to effectively prevent spills. Breakaway valves are typically used on fuel lines, main fuel tanks, extended range aircraft auxiliary fuel tanks, air-to-air refueling systems, and fall-away external tanks. Tank vent lines often use the single valve versions. The basic design incorporates a butterfly valve mounted to a cam shaft loaded by a coil spring. This design allows for a small envelope, lightweight, and minimum pressure drop across the coupling. The mechanism consists of two valve plates andor a single plate and detent post. These are held against each other by spring action until the fuse section separates to allow valve closure. An internal sealing sleeve is installed in between the interface joint of the two valve bodies and seals the fluid leakage from internal to external before valve bodies are totally separated. This construction permits a clean valve passage, minimizing ice formation and contamination. No parts are released to interfere with the valve operation during closure. The primary function of breakaway valves is to protect attached fuel system lines from damage due to excessive separation loads. Breakaway valves safely separate at the fuse area, preventing fuel line rupture while sealing the fuel lines before the attached plumbing material can be stressed to the point of failure or leakage. The breakaway fuse is usually designed to separate at 25 to 50 percent of the attaching structure or tubings normal strength, allowing controlled and safe separation in the line, and valve closure before damage occurs. The 21605 series Breakaway Valves are designed for 1.0 inch fuel systems with options for single or dual valve closures. It is available in aluminum alloy body construction. Component materials include stainless steel and other materials compatible with typical aviation fuel. Contact Stratoflex for assistance on material information. APPLICATIONS: The Stratoflex breakaway valves are used on a variety of aircraft and helicopter fuel systems in service today. Programs include CH-47, H-60, V-22, 777LR, P-8, 767-2C, and other commercial and military platforms. FEATURES AND ATTRIBUTES: Light weight design Low pressure drop based on streamline valve designFuse section provides controlled separation at defined loadsSwivel end fittings prevent damage to fuse section during installationInterface connections (flange mountings) can be modified to suit specific applicationsMeets typical fuel system electrical bonding requirements OPTIONAL FEATURES: The breakaway valve is typically installed or adapted to specific platform applications and interface connections (flange mounting configurations). This product qualification is based on the specific platform installation and performance requirements. Contact Parker with interface and performance requirements to determine if this product can be adapted to your specific application.

The Parker Aerospace automatic bleed valve provides automatic detection and bleeding of air in a hydraulic system. This Parker Aerospace proprietary technology offers the advantage of maintenance-free air management similar to air and oil systems while preserving the benefits of a closed system for improved performance. The device is typically mounted directly to the reservoir as a line-replaceable unit and may be controlled through the aircrafts computing system. Automatic air bleed valves can be designed into reservoir manifolds, or can also be remotely located wherever air collects in a system. This would allow existing fleets to benefit from reduced maintenance time and increased hydraulic system performance. TYPICAL OPERATIONThe valve can be located at high points in the return line of the hydraulic system where air is known to collect. With 28 VDC applied to the automatic bleed valve, onboard electronics are used to control a leak-free solenoid valve that purges air from the system. APPLICATIONS:This technology is already qualified for use on the Boeing 787 and Airbus A350 XWB. OPTIONAL FEATURES:In addition to our existing units, the Parker Aerospace product development team has the skill set and engineering tools to custom design an automatic air bleed valve that will meet your specific application requirements. Please contact us to see how we can engineer a solution for your application. The valve can be designed to operate autonomously, making its own decision to purge air from the hydraulic fluid. Alternatively, the valve can be wired to allow control from the aircraft computer, based on flight profile. FEATURES AND BENEFITS:Automatic detection and bleeding of air in a closed-hydraulic system for improved performanceProprietary technology offers the advantage of maintenance-free air management of air and oil systems Onboard electronics are used to control a leak-free solenoid valve that purges air from the systemEliminates need for manual reservoir bleed, saving time and hydraulic fluid

Parker Stratoflexs ground service equipment (GSE) quick disconnect (QD) couplings provide a proven solution for making the connection from the hydraulic ground service cart to the aircraft hydraulic system supporting routine ground maintenance. These GSE QDs are specifically designed as the interface from ground cart to aircraft for 3, 000 psig hydraulic systems and are commonly used on both commercial and military programs. The flight side QD nipple half and cap are typically installed on the aircraft hydraulic system service panel or in other locations where appropriate to provide the access point for the hydraulic system servicing connection interface. The GSE QDs use established engineering and design experience to provide this thread-together style connection with a visual and touch confirmation of proper coupling to improve both time and safety. The design incorporates a ratchet-tooth style latching mechanism to ensure that once the two coupling halves are threaded together and fully connected, they are positively locked in place. The ratchet teeth engage to prevent unintentional disconnection of the coupling halves; they provide a secondary locking feature for added safety and security. To disconnect, the outer actuating collar on the coupler half (ground side) is pulled back, releasing the ratchet teeth engagement and while being pulled back, rotated in the counterclockwise direction until fully unthreaded. GSE couplings incorporate a self-sealing valve that permits fluid flow with minimum pressure loss and turbulence, plus a flush-faced design minimizes air inclusion or spillage during coupling or uncoupling. The design allows for simple one-handed operation to connect (thread-on) or disconnect (unthread) the coupling halves during ground service and maintenance of the hydraulic fluid system. As the coupling halves are threaded together, the fluid-flow path opens and when in the fully-open position (hand tight, ratchet teeth fully engaged), the GSE QD connection is complete. The GSE QD consists of two halves, the nipple (441xx series) which is mounted on the aircraft and provides access to the aircraft hydraulic system. The coupler (440xx series) is the interface on the hydraulic ground service cart. The nipple QD half has provision for a latching cap to be installed (C44000 series) to ensure protection of the sealing surfaces during normal aircraft operation. The ground coupler QD half can be protected from foreign object damage, dropping and dragging handling damage in the sometimes harsh ground cart environments using the latching plug (P44000 series). Parkers GSE QDs provide proven reliability for todays standard interface for aircraft utilizing 3, 000 psig hydraulic systems. See the Parker Stratoflex product brochure (Catalog 106-GSE) for size and dimensional information. Standard QD end fittings include:SAE MS33656, MS33657 male flared fittingSAE AS4395, AS4396 male flared fittingSAE AS33514, AS33515 male flareless fitting The GSE quick disconnect series has been proven over years of service and a history of reliability both in the air on the ground. The baseline qualification for this product is built on the applicable requirements of industry standard SAE AS1709 specification. For 4, 000 and 5, 000 psig hydraulic operating system pressures, Parker Stratoflex offers our robust Thread-Lok QD product adapted specifically for ground service applications. Thread-Lok applications are ideal for high vibration, shock, and impulse load environments. The mechanical advantage of connecting the coupling halves with a thread-together design, often provide the most robust performance in systems including engines, landing gear and brake systems.Contact the Stratoflex Products Division with interface and performance requirements to determine if this product is the best choice for your installation and application. APPLICATIONS: Parkers GSE QD provides positive latching with efficient size, light weight, and high reliability to support hydraulic systems in service on todays aircraft. Programs include A-10, C-130, CH-47, H-60, Embraer E170, E190, Bombardier CRJ series and a range of current and new aircraft platforms for both military and commercial jets. FEATURES AND ATTRIBUTES: Designed to protect system integrity without restricting fluid flow rate or operationEngineered, tested, and qualified to provide long-term reliable service for hydraulic service connections on 3, 000 psig operating systemsThread to connect with positive visual and touch indication of fully-connected and latched positionMeets performance requirements of SAE specification AS1709; see 44000 QD qualificationEfficient size and flow-rate combination for hydraulic system applicationsLight-weight designSimple, one hand connect and disconnect operation for ease of useRange of end-fitting styles and fluid-compatibility options availableAluminum alloy and stainless steel constructionApproved on U.S. Government selected NSNs Locking caps C44000 series for use on 441XX series QD nipples (aircraft side)Locking plugs P44000 series for use on 440XX series QD couplers (ground side) OPTIONAL FEATURES: Standard configuration is available in aluminum alloy body construction. Component materials include stainless steel and other materials compatible with specific fluid applications. Contact the Stratoflex Products Division for any other specific material, fluid, or pressure requirements and information.

Slide-LokTM couplings provide quick connectdisconnect capability with self-sealing action and superior performance during operation and maintenance of fluid systems. The Slide-Lok design is a push-to-connect, pull-to-disconnect style coupling. The Slide-Lok series are compatible with a range of system fluids currently used in today's high-technology aerospace andground, plus under-sea systems and are available in a variety of temperature and pressure ranges. Slide-Lok couplings are the ideal selection for a quick disconnect where size, weight, performance, and reliability are important application criteria and are deal for use in cooling, fuel, hydraulic, and pneumatic system applications. Series sizes range from -02 (18 inch) up to -20 (1 inch) line sizes. The basic Slide-Lok design incorporates Stratoflex efficient self-sealing valving that permits fluid flow with minimum pressure loss and turbulence. Our valving design has proven reliability and is used extensively on a wide range of aerospace platforms in service today along with high-performance, ground-based applications. A flush-faced valve design provides minimal air inclusion or spillage during the connect and disconnect operation, while one-piece housing designs offer few potential seal leak paths and high reliability. The primary function of the Slide-Lok quick disconnect coupling is to allow the user with simple, one-hand operation to connect (push) and disconnect (pull) the coupling halves during installation and maintenance of the fluid system. As the coupling halves are pushed together, the fluid flow path opens, and when in the fully open position, the coupling halves are locked together using Parker Aerospaces reliable and high-strength collet-style locking mechanism. This style of locking mechanism features significant surface contact and load-carrying capability compared with most push-to-connect quick-disconnect designs, which use some form of ball locking with limited point contact. Typical installations use the coupler half with latching mechanism on the hose or tube side and the nipple half installed on a panel or in a manifold. The Slide-Lok quick disconnect requires linear movement to connect and disconnect along with room to access the outer, or actuating ring by hand in order to pull back the ring and disconnect the two halves. Standard QD end fittings include:SAE AS33656, AS33657 male lfared fittingSAE AS33514, AS33515 male flareless fitting APPLICATIONS:The Parker Aerospace Slide-Lok quick disconnect couplings are used on a variety of aerospace and related applications where small size, light weight, and high reliability are important for systems in service today. Programs include commercial and military programs such as: F-15, F-16, FA-18, F-22, C-17, a wide range of cooling system fluids (PAO, EGW, PGW), and applications including the Patriot missile launcher. Parker Aerospaces Slide-Lok quick disconnects are also used by many top Formula One race teams based on their small size and high reliability. FEATURES AND BENEFITS:Small and very efficient size and flow-rate combination, ideal for cooling system applicationsLight-weight designLow pressure drop based on streamline valve designSimple, one-hand connect and disconnect operation for ease of useRange of end-fitting styles and fluid compatibility options availableStainless steel construction meets typical electrical bonding requirements OPTIONAL FEATURES:Standard configuration is available in stainless steel body construction. Component materials include stainless steel and other materials compatible with specific fluid applications. Contact the Stratoflex Products Division for any other specific material information. PRODUCT CHOICE CONSIDERATIONS:The Slide-Lok quick disconnect has an extensive service history across many aircraft platforms with proven reliability. The baseline qualification for this product is based on the applicable requirements of industry standard SAE AS1709 specification. In some cases, qualification is based on or may be required for specific platform installation and performance requirements. Contact the Stratoflex Products Division with interface and performance requirements to determine if this product is the best choice for your installation and application.For specific applications where high vibration, shock, and impulse load environments exist, Parker Aerospace recommends the Thread-Lok quick disconnect coupling series. The mechanical advantage of connecting the coupling halves with a thread-together design, often provides the most robust performance in systems including engines, landing gear, and brake systems.

Parker Stratoflexs single shut-off coupling (SSC) is designed with self-sealing valving to prevent fluid leakage when disconnected from the fluid system. The SSC provides one-side sealing of fluid when disconnected. Used in aircraft hydraulic systems and located at the interface of the engine-driven pump or similar equipment, the SSC is installed on the flexible hose assembly and threads on to an industry standard fitting at the pump, SAE AS4375, AS33514 or bulkhead fitting equivalents. Operation and use of the SSC is simple, positive and reliable. In the fully connected and torqued (installed) position, the SSC valving is open to flow and provides low pressure drop performance. To uncouple, the SSC outer collar is untorqued and unthreaded from the mating standard male fitting. As the SSC is unthreading, the internal valving seals and prevents excess loss of fluid from the SSC and flex hose side of the connection. The standard fitting side remains open, with no self-sealing valving on that side of the connection to retain fluid. Once fully disconnected, the pump or mating equipment and fitting are able to be removed and replaced as required. Parker Stratoflex SSCs use proven engineering and design experience to provide a small size and light weight design with performance requirements to meet industry Standard SAE AS1896. Standard SSC end fittings include:SSC male fitting (hose connection side): SAE AS4375, AS33514 SSC mates with equipment fitting (pump side): SAE AS4375, AS33514, AS4376, AS33515 APPLICATIONS: The single shut-off couplings are used on a variety of aerospace and related applications where proven performance and sealing on one-side only when disconnected is a key requirement along with small size, light weight, and high reliability are important for systems in service today. Programs using the Parker Aerospace SSC include military aircraft hydraulic systems for C-5, C-17, P-8, 767-2C tanker, A400M, and commercial hydraulic systems for 737NG, 747-400, 757, 767, 777, 787, A350 and the Dash-8-400. FEATURES AND ATTRIBUTES: Provides ease of system maintenance in removing engine-driven hydraulic pump or similar equipment while sealing fluid on the flex hose side and preventing excessive spillage or fluid contaminationEngineered, tested, and qualified to provide long-term reliable service in harsh engine environmentsThread to connect with standard fitting to open self-sealing valve and fluid flow Torque to finalize installation similar to standard hose B-nutMeets performance requirements of SAE specification AS1896Sizes range from -06 (38 inch) to -24 (l inch) line sizesEfficient size and light weight designLow pressure drop based on streamline valve designDesign configurations available to meet fire-resistant or fire-proof requirements per SAE AS1055Material options for performance and fluid compatibility options availableStainless steel construction meets typical electrical bonding requirements OPTIONAL FEATURES: Standard configuration is available in stainless steel body construction. Component materials include stainless steel and other materials compatible with specific fluid applications. Contact the Stratoflex Products Division for any other specific material information or requirements and to confirm part numbers. The single shut-off coupling series has been proven over years of service with a history of reliability for aircraft and engine applications. The baseline qualification for this product is based on the applicable requirements of industry standard SAE AS1896 specification. In some cases, qualification is based on or may be required for specific platform installation and performance requirements. Contact Stratoflex Products Division with interface and performance requirements to determine if this product is the best choice for your installation and application. Not all sizes, pressure ranges, or materials may be available.

Parker Stratoflex offers a range of non-locking coupling designs, materials, features, and sizes for fluid system applications. Non-locking couplings are commonly used in aerospace and military fluid cooling systems, providing modularity for key components such as electronics boxes and fast, reliable connection to open-fluid flow when the coupling halves are fully engaged. The 316 series non-locking couplings are equivalent to size -3 (316 inch) for fluid flow area. They are uniquely designed to connect with self-aligning valving for applications needing inlet and outlet fluid flow. Locking the coupling halves in place typically requires some form of external retention and latch. The 316 series couplings are often used in electronic boxes or cards that install into an overall rack or chassis that provides the cooling fluid. These couplings make the connection between the rack-coupling half and the module- (or box-) coupling half to allow fluid flow when fully engaged. Self-aligning valving allows for manufacturing tolerances to be accommodated and the coupling halves to align properly during connection. Self-sealing valving prevents fluid spillage and leakage when the coupling halves are disconnected. Parker uses our precision valving design, common in many of Stratoflex coupling products, to provide optimum fluid-flow characteristics. Stratoflex non-locking couplings have excellent aerospace service history, proven reliability, efficient small envelope size, light weight, and low pressure drop to offer the right solution in todays fluid system applications. The pressure-relief valve option provides reliable crack and resealing capability in the disconnected module-half of the coupling to prevent damage from over pressurization. Please consult Parker Stratoflex with specific requirements, to confirm part numbers, and for available product information that may meet your application needs. APPLICATIONS: Parker Stratoflex non-locking couplings are currently used on aerospace system applications for cooling fluids including polyalphaolefins (PAO), ethylene glycol-water, propylene glycol-water, and other system fluids. Applications include both military and commercial aircraft along with ground vehicles. FEATURES AND ATTRIBUTES: Precision sealing, no leakage or spillage during connect and disconnectSelf-aligning valving allows for installation and connection alignment within specified valuesEfficient size and flow rate combination for with low pressure drop valving designLight-weight design and material optionsProven service history and reliability Primary construction in corrosion-resistant stainless steel Designed for precision system applications including fluid compatibility, pressure, flow rate, pressure drop, crack, and reseat capabilities for aircraft system applications requiring high reliability and precision performance. OPTIONAL FEATURES: The relief valve feature can be incorporated in the Parker Stratoflex quick disconnect couplings (QDC) for applications that may require pressure and fluid relief for the certain system applications. This feature is typically incorporated in the module-half of the coupling to prevent damage due to over pressurization when disconnected and the internal fluid volume is exposed to elevated temperature.Print Product Overview

The valve is spring-loaded to the normally closed position to provide motive flow line isolation from downstream equipmentlines when the motive flow supply is non-operational. This elegantly simple design is extremely reliable and several variations of this valve have been produced by Parker for over 30 years. A fuel swing check valves is an ideal choice if surge pressures and any hammering effects are an important design consideration. This valve is typically installed horizontally and with the hinge up so that in the unlikely event the torsional spring should break, the valve shall fail close. With its low pressure drop and low leakage rate, this valve is an ideal choice when properly selected for the right application. The material and finishes used in the construction of the valve and those of similar, previously qualified valves are unaffected by several environmental conditions listed in RTCA DO-160 and MIL-STD-810. APPLICATIONS: Commercial aircraft, military fighters and transports, business and general aviation. FEATURES AND ATTRIBUTES: Fundamental features of the fuel swing check valve include the following:Very low pressure dropInternal components are completely shielded by an aluminum alloy body from the environmentLow Internal leakage