美国仙童，21312 Fairchild Model 21 Adjustable Ratio Relay
Fairchild Model 21 adjustable ratio relay with a 30:1 through 1:30 ratio range and 1/4in FNPT ports
Product Type: Adjustable Ratio RelayManufacturer: FairchildProduct Family: Model 21Flow Capacity: 40 SCFM (68 M³/HR)Max. Output Pressure: 150 PSIGMax. Supply Pressure: 250 PSIG
The Model 21 Adjustable Ratio pneumatic relay has a signal chamber lever arm, whereby the ratio of output pressure to signal pressure is infinitely adjustable. The adjustment range permits signal amplification of 1:30 or signal reduction of 30:1 by rotation of the ratio adjustment knob which moves the fulcrum. . Output pressure is a function of signal pressure times the ratio of lever arm lengths on either side of the fulcrum. Bias may be introduced by means of the set screws. The Model 21D is available with both input and output adjustable bias. Maximum input bias is 3 psig, with a maximum output bias of 9 psig. The basic mathematical expression for the bias in this relay is Po = (Ps-K1) R+K2, where Po = Output pressure, Ps = Input signal, R = Ratio of setting, K1= Input bias, (-) only, and K2 = Output bias, (+) only.
Features
Adjustable from 30:1 dividing ratio to 1:30 multiplying ratio
Venturi aspiration system
Optional input and output biasing
Floating seal ring isolates control chamber
Panel or Line Mounting
Benefits
Assures infinite pressure adjustments
Compensates for downstream pressure losses
Allows versatility in applications
Increased stability by reducing effect of high flows
Easy installation and service in the field
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FAIRCHILD 10292 20.00
FAIRCHILD 10232 5.00 调压阀
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