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斯派莎克減壓閥BRV73 簡介
BRV71和BRV73為球墨鑄鐵材質的直接作用式減壓閥，前者為螺紋連接，或者為法蘭連接。主要用于蒸汽系統。結構緊湊，設計簡單，表面高質量的無電極涂鎳處理。與BRVZ系列減壓閥相比，BRV71和BRV73內有壓力平衡波紋管，可以平衡主閥頭上的壓差。主閥為平面密封，具有自清洗功能。
斯派莎克減壓閥BRV73 工作原理
1、開始時，回復彈簧將閥關閉，蒸汽壓在閥芯表面及波紋管表面（兩者面積相等）施于相等的壓力。
2、如在此時以順時針的方向轉動調壓手柄，控制彈簧會因受壓而向下迫使閥桿將閥芯推離閥座使蒸汽流通進入下流側。
3、下游壓力會經閥芯下的感應孔進入感應室迫使控制波紋管向上延伸。同事也向下面的壓力平衡波紋管施壓消除閥芯背面的下游壓力的影響。
4、當施加在控制波紋管的下游壓力大于彈簧的控制力量時，推動主閥桿及閥芯向上移動使閥關閉，在正常情況下，閥會維持在一定的高度，依不同的壓力變化和負載條件做小幅度調整
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
