초록 ▼

An orifice controlled poppet valve includes a pilot poppet pressure balancing arrangement which prevents fluid leakage between the valve inlet and outlet. The pressure balancing arrangement includes a pin slidable in a passage in the main valve member, which passage extends between the inlet and a p

An orifice controlled poppet valve includes a pilot poppet pressure balancing arrangement which prevents fluid leakage between the valve inlet and outlet. The pressure balancing arrangement includes a pin slidable in a passage in the main valve member, which passage extends between the inlet and a pilot outlet passage. One end of the pin engages a stem which projects from from the pilot poppet. The other end of the pin engages a flexible diaphragm which forms a seal between the valve inlet and the passage which receives the pin. An inlet pilot passage includes an annular clearance upstream of an orifice. The radial dimension of the annular clearance is smaller than the diameter of the orifice.

대표청구항 ▼

In a pilot-operated control valve having a housing defining a fluid inlet and a fluid outlet, a main valve member movable in the housing to control fluid communication between the inlet and the outlet, the main valve member having a pilot passage therein extending between the inlet and outlet and ha

In a pilot-operated control valve having a housing defining a fluid inlet and a fluid outlet, a main valve member movable in the housing to control fluid communication between the inlet and the outlet, the main valve member having a pilot passage therein extending between the inlet and outlet and having a pilot valve seat surrounding a portion of the pilot passage, the control valve also having a pilot poppet engageable with the pilot valve seat and movable in relation thereto to control fluid communication through the pilot passage to thereby control movement of the main valve member, and having means for hydrodynamically balancing the pilot poppet, characterized by: the pilot poppet being a solid member; and the balancing means being completely received by the main valve member.