<p>A pressure regulating system including a main valve with an expansible tube stretched over a cylindrical barrier so that flow occurs around the barrier only when a pressure fluid in a control chamber around the tube is overcome by upstream pressure. A pilot valve senses downstream pressure and opens when it drops to a predetermined level to exhaust the control chamber to a low pressure zone. Flow around the barrier is increased by evacuating the control chamber to a zone within the valve housing at a pressure lower than downstream. This occurs in a zone wherein the static pressure of the downstream fluid line is converted by the flowing stream to a high velocity, low static pressure. In areas where an atmospheric bleed is not objectionable, a second pilot valve may be provided to exhaust the control chamber to atmosphere if downstream pressure drops to a set lower level.</p>
申请公布号
DE2142394(B2)
申请公布日期
1978.09.21
申请号
DE19712142394
申请日期
1971.08.24
申请人
GROVE VALVE AND REGULATOR CO., OAKLAND, CALIF. (V.ST.A.)
