F - Mech Eng,Light,Heat,Weapons – 16 – K
Patent
F - Mech Eng,Light,Heat,Weapons
16
K
137/112, 137/99
F16K 31/02 (2006.01)
Patent
CA 1148060
A B S T R A C T THREE-WAY NORMALLY CLOSED PILOT VALVE A three-way normally closed only, pilot valve for supplying pressurized pilot air to a fluid flow con- trol valve, such as a four-way valve, a three-way valve, a two-way valve, or the like, for shifting the main spool valve of such valves. The pilot valve includes a valve body with a pressurized pilot air inlet port, a cylinder port, and an exhaust port. The inlet port is connected by a first passageway to the cylinder port. The cylinder port is connected by a second passageway to the exhaust port. A poppet spool valve is movably mounted in the valve body be- tween an inoperative position for blocking the first pass- ageway means, and an operative position for opening the first passageway means and blocking the second passageway means. A spring and air assist return means moves the poppet spool valve to the inoperative position. A solenoid moves the poppet spool valve to the operative position. The poppet spool valve has only one dynamic seal. The pilot valve includes a pair of longitudinally spaced apart, sharp edged valve seats which are alternately engaged, by a pair of longitudinally spaced annular valve members on the pop- pet spool valve, when the poppet spool valve is moved be- tween the operative and inoperative positions.
382599
Borden Ladner Gervais Llp
Mac Valves Inc.
LandOfFree
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