Valves & Valve Fittings #4992649

The Marsh Bellofram Type 10 Air Pressure Regulator is designed to control output pressure with accuracy of 0.1% and high-repeatability, with very low sensitivity to changes in supply pressure, ambient temperature and flow. The highly rugged design of the Type 10 includes unique features such as high start-up stability, which eliminates the need for regulated start pressure readjustment after long downtimes with automatic return to output setting at start-up; incorporation of a high-gain pneumatic servo amplifier for regulated pressure, ranging from dead end to 20 cubic meters per hour (12 SCFM), held constant over substantial flow changes; incorporation of an extra-large capacity integral relief valve, for exhaust flow when regulated pressure is reset to a lower value, with automatic high downstream relief under dead end conditions; and incorporation of a high-performance servo-operated control mechanism in the regulator, for added pressure stability. The entire measuring element, including pilot valve, is fabricated from heat-treated stainless steel to eliminate hysteresis or permanent deformation under all working conditions. An integral relief valve provides for exhaust flow whenever the regulated pressure is reset to a lower value. In addition, the available Type 10 motorized configuration allows for easy integration into open- or closed-loop process control systems and programmable controllers.

The Type 110 Large Forward and Exhaust Flow Air Pressure Regulator combines the proven technology of the Type 10 regulator with the large pneumatic booster of the Type 79 Relay. The result is a precise, crisply responding regulator that can achieve very large forward and exhaust flows. Forward to reverse flow offset is minimized by the capsule operated, servo-control system located in the upper portion of the regulator. This servo-control system supplies a pilot pressure to the large integral pneumatic booster. The large supply and exhaust orifices of the integral booster enable this regulator to produce very high forward and exhaust flow rates. Few regulators can offer this combination of sensitivity and large flow capacity. As with all of the Type 10 regulators, the stainless steel measuring capsule is the heart of the Type 110 Pressure Regulator. Originally developed for sensitive aircraft altimeters, this precision-sensing element provides the energy to activate the servo-control mechanism. It provides greater regulation and accuracy while eliminating the problems usually encountered with range springs and conventional diaphragms. Because of the balanced supply valve in the integral pneumatic booster, the Type 110 can work with higher supply pressures (250 PSIG) than many other regulators. The Type 110 was developed specifically for use with Air Balancing Systems or Zero-Gravity Arms. Such systems require very small forward to reverse flow offsets for smooth operation. The precision regulators that can achieve the sensitivity requirements do not typically possess the forward or exhaust capacity to handle large balancing arms or cylinders. The Type 110 does not have this limitation. It is ideal for use in any application where precise regulation of pressure is required along with high flow or high exhaust capacity.

he Marsh Bellofram Type 70 High-Flow Air Pressure Regulator is expressly designed for applications requiring substantial flow capacity of up to 80 SCFM (2250 LPM) and accurate pressure controls. Downstream pressure can be set within 0.25 in. (6.3mm) of water column and is accurately maintained under varying conditions via an aspirator tube which adjusts air supply in accordance with flow velocity. A balanced supply valve, utilizing a patented Bellofram rolling diaphragm design, makes the regulator virtually immune to changes in supply pressure, and offers millions of cycles.

The Type 77 Vacuum Pressure Regulator from Bellofram PCD incorporates a fixed negative 15 psig bias spring to maintain vacuum outputs up to 29 Hg. An adjustable opposing range spring increases controlled pressure outputs up to 150 psig. Output pressure droop under varying downstream flow conditions is minimized by use of an aspirator tube which adjusts the air supply valve opening in accordance with flow velocity. A balanced supply valve, utilizing a reinforced rolling diaphragm, keeps regulator output virtually immune to changes in supply pressure. Stack-up construction makes the Type 77 easily serviceable, without removing it from the air line. The Type 77 provides precise control in sub atmospheric pressure applications. Specific uses include sample collecting systems, air quality monitoring, parts coating operations, and other industrial functions requiring controlled system pressure from 29 Hg vacuum to 150 psig. The regulator may be installed either upstream or downstream from the vacuum pump. Upstream installation is preferred when rapid evacuation of a vessel or system is required, because the exhaust capacity of the pump is normally greater than that of the regulator. In all other applications, the regulator can be located between the pump and the vessel.

The Type 78 Direct Acting Air Pressure Regulator designed from Bellofram PCD is design to offer high-accuracy, large flow and exhaust capabilities within OEM and industrial applications. Available in five different pressure output ranges to 125 psig (8.6 BAR), this precision regulator offers low droop, high accuracy and fine adjustment sensitivity with maximum supply pressure rated at 400 psig (27.6 BAR) and achievable flow rates of well over 200 SCFM.