• 功能:

  比例可调

The Model 21 Adjustable Ratio pneumatic relay increases stability by reducing the effect of high flows. It has an adjustable signal pressure. The range of this device permits the signal amplification of 1:30, or signal reduction of 30:1, simply by rotating the ratio adjustment knob that moves the fulcrum. 
It has an easy-installation capability, and is capable of operating in the field. It offers versatility in application, and compensates for downstream pressure for losses. It assures an infinitely adjustbale pressure for specific operations.
The floating seal ring isolates control chamber, and can be mounted in panel or line. The pneumatic relay features both input and output adjustable bias. The maximum input bias is 3psig, and the maximum output bias is 9psig.