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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 stages
Hysteresis four or five percent maximum for input signals
First-stage screen of 90 or 2500 microns
Consistent dynamics up to 25 or 50 percent of full flow

Features of the model 410 servovalve
Reliability 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 - T135
Certification: NI 1 2 ABCD T3C Ta=135C


Features of the model 415 servovalve
Passes 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 systems
Smooth ball bearing operation for long life and reduced torque
Qualified at over 100, 000 swivel cycles with side load to ensure reliability
Minimal pressure loss at rated flow based on optimized flow-path design
Low torque for rotation at system pressure
Dust seal prevents dirt and grit contamination for optimum service life
Fitting styles include flared, flareless, and beam seal ends
Available in titanium and stainless steel (CRES) options

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 design
Fuse section provides controlled separation at defined loads
Swivel end fittings prevent damage to fuse section during installation
Interface connections (flange mountings) can be modified to suit specific applications
Meets 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.

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 fitting
SAE 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 applications
Light-weight design
Low pressure drop based on streamline valve design
Simple, one-hand connect and disconnect operation for ease of use
Range of end-fitting styles and fluid compatibility options available
Stainless 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.