Spirax sarco Introduction
BRV71 and BRV73 as the direct effect of ductile iron valve, which is threaded connection, flange connection or for. Mainly used for steam system. Compact structure, simple design, high quality surface without electrode coated nickel processing. Compared with the BRVZ series valve, BRV71 and BRV73 within apressure balanced bellows, can balance the pressure difference on the main valve head. The main valve is a plane sealing, with self cleaning function.
Working principle
At the beginning of 1, a return spring, the valve is closed, the spool surface and surface vapor pressure bellows (both with equal area) is applied to theequal pressure.
2, as in the time in a clockwise direction of rotation regulating handle, control spring due to pressure forces the stem of the valve core is pushed off from the valve seat so that the steam flow into the downstream.
3, the downstream pressure via the induction hole valve core under theinduction chamber into the corrugated tube extending upward force control.Colleagues pressure balancing corrugated pipe pressure to eliminate theinfluence to the downstream pressure of the valve back.
4, when the control force is applied in the control of downstream pressurebellows is greater than the spring, push the main valve rod and a valve core to move the valve closed, under normal circumstances, the valve will be maintained at a certain height, according to different load conditions andpressure changes in the small adjustment
