Cla-Val 354GF - Manual

In-Line Pressure Control Valve
354GF
• Deadman Operated
• Externally Sensed Pressure Regulation
• Various Pilot Options (Air, Fuel, Electric)
• Deadman Pressure Setting Controls Delivery Pressure
• 4-Inch ANSI 150 Flanges
• Victaulic Adapters Available
• Lightweight Aluminum Body
• Internal Pistons are Stainless Steel for better
performance
• 1,200 Gallons per minute maximum required flow rate
MODEL
The Cla-Val Model 354GF Valve is used to control fuel pressure
delivered into an aircraft thru an under wing refueling nozzle, The
354GF is intended for use on various forms of aircraft refueling
vehicles.
Model 354GF In-line Pressure Control Valve is a direct acting piston
valve controlled by an external deadman device. When the
deadman signal is “On” (applied), the valve opens to delivery fuel
downstream. Opening times vary by application and are preset to
be between 5 and 10 seconds. When the deadman signal is
release/removed, the valve closes. Closing time is adjustable, but
is set at the factory for between 2 and 5 seconds. Closing speed
can also be adjusted to control overshoot (the volume of fuel that
passes through the valve after the deadman signal is removed and
when the valve fully closes).
A Pilot Block on the top of the 354GF provides a connection point for the deadman supply
pressure (fuel or compressed air) and for the Fuel Sense line. The Cla-Val Model 354GF In-line
Pressure Control Valve provides a means of controlling (regulating) fuel pressure at a remote
sensing point on the refueling vehicle, such as a Venturi. The desired delivery pressure is set
by the deadman pressure source. There is an approximately 20 psid difference (bias) between
the deadman pressure supplied and the resulting delivery pressure. For instance, a deadman
pressure of 70 psig will result in a delivery pressure setting of about 50 psig.
The 354GF not only controls delivery pressure, but also reacts quickly to control pressure surges.
Components within the Pilot Block assure steady pressure regulation without hunting, yet can
react to surges in delivery pressure by causing the 354GF to close quickly to limit delivery
pressure surges to below 120 psig. This simple, yet effective design replaces the need for
complicated servos used on competing products.
This 4 inch In-line Valve is rated for 1,200 gpm maximum. As an added environmental protection, the 354GF In-line Pressure
Control Valve features a manual bleed valve on the Pilot Block to which a bleed hose can be easily attached so that bleeding
air from the Valve does not result in a fuel spillage.
The Cla-Val Model 354GF In-line Pressure Control Valve is constructed of aircraft-grade Aluminum and Stainless Steel. This
very rugged design can withstand a high level of abuse and still reliably function in critical applications. As an example, the
internal Pistons of the 354GF are made from cast 303 Stainless Steel.
Principles of Operation
Parameter Value
Design Pressure 225 psig (15.5 bar)
Burst Pressure 400 psig (27.58 bar)
Rated Flow 1,200 gpm (4500 l/min)
Pressure Drop 4.7 psid @ 1,000 gpm
Opening Time 5 - 10 sec. (factory set)
Closing Time 2 - 5 sec. (adjustable)
Overshoot < 5% of flow
Repeatability ± 3 psig (.21 bar)
Surge Pressure Control < 120 psig (8.27 bar)
Operating Temperature -40 - 120°F (-40 - 48.9C)
Technical Data
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