F - Mech Eng,Light,Heat,Weapons – 15 – B
Patent
F - Mech Eng,Light,Heat,Weapons
15
B
137/34
F15B 13/04 (2006.01) G05D 7/01 (2006.01)
Patent
CA 1106726
NORMALLY CLOSED PRESSURE COMPENSATED FLOW CONTROL VALVE Abstract of the Disclosure A fluid flow control valve assembly for use in a hydraulic system of the type including a cylinder which raises and lowers a load responsive to the receipt and exhaustion of hydraulic fluid at a cylinder port provides metering of the hydraulic fluid from the cylinder port at a constant desired rate for lowering a load at a corresponding constant rate which has been raised by the cylinder. The valve assembly comprises a valve block of solid material having a plurality of valve receiving bores and a plurality of fluid communicating channels. A normally closed valve within a first one of the valve re- ceiving bores has an input oriface communicating with the cylinder port by a first one of the fluid communicating channels and an output oriface. The normally closed valve is selectively actuable for permitting the flow of fluid from the cylinder. A pressure compensating valve within a second one of the valve receiving bores has an input orifice communicating with the normally closed valve output orifice by a second one of the fluid communicating channels and an output orifice. The pressure compensating valve within a second one of the valve receiving bores has an input orifice communicating with the normally closed valve output orifice by a second one of the fluid communicating channels and an output orifice. The pressure compensating valve maintains a constant fluid flow pressure and a constant fluid flow rate from the cylinder. A baffle within the second fluid communicating channel restricts the rate of fluid flow from the normally closed valve to the pressure compensating valve and thereby causes the pressure compensating valve to gradually increase the fluid flow rate from the cylinder to the desired fluid flow rate and to maintain the fluid flow rate constant thereafter. The pressure compen- sating valve also includes means by which it is normally closed prior to the actuation of the normally closed valve and opens gradually in response to the fluid pressure developed by the hydraulic fluid exiting the cylinder. - 1a -
333638
Modular Controls Corporation
Smart & Biggar
LandOfFree
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