BALANCED PRESSURE-REDUCING VALVE OF WORKING MEDIUM Russian patent published in 2004 - IPC

FIELD: devices of pneumo-hydraulic control, applicable in different branches of industry and transport for reduction of gas (liquid) pressure to the preset value and automatic maintenance of the preset pressure.

SUBSTANCE: the balanced pressure-reducing valve of working medium has a body with inlet and outlet cavities, final control element positioned in the body and consisting of a seat positioned between the inlet and outlet cavities, and a spring-loaded hollow stop valve with a through hole for communication of the valve cavity with the outlet cavity, located in the inlet cavity. The sensing element with the adjustable spring is positioned in the outlet cavity and is made engageable with the stop valve by means of a rod. A sealing element is installed in the movable joint of the stop valve and the body. The pressure-reducing valve has an additional safety valve with a spring located in the cavity of the stop valve for hermetic sealing of the through hole at a fault of sealing of the sealing element. The safety valve is made for passage of working medium to the cavity of the stop valve. To provide passage of working medium to the cavity of the stop valve, flats are made on the guide surface of the safety valve. To provide hermetic sealing of the through hole, the stop valve on the side of the inner end surface has a seat, and a flexible element is fastened on the end surface of the safety valve.

EFFECT: enhanced reliability of the pressure-reducing valve.

2 cl, 1 dwg