Exhaust valve
OwnerEdward L. Horton, Jr., Anna M. Hortoninventors
Life of this patent
Estimating the term…
Abstract
A valve for rapidly filling and emptying a volume created by rapid displacement of a machine member. The valve has a body to be connected between a reservoir and the machine. The valve has a valve seat with a seating surface that surrounds the flow path of fluid from the volume and an integral valve guide connected to the seat. A valve opening toward the machine is spring urged toward closed position to withstand high pressure of the fluid at the machine. An auxiliary mechanism is provided to open the valve which may be a solenoid, a pilot piston, or fluid cylinder or manual operation. The valve is provided with a dashpot to provide smooth operation.
Claims8
In combination a machine having a ram cylinder, a ram piston in said cylinder extending downwardly therefrom and engaging a crosshead,
- a platen supported below said ram piston for supporting work to be engaged by said crosshead,
- a reservoir adapted to contain liquid supported above said ram cylinder and having a passage in a wall thereof,
- means connecting said reservoir to said ram cylinder,
- said means connecting said reservoir to said ram cylinder comprising
- a flow passage,
- a separate valve seat supported on said ram cylinder around said flow passage positioned between the top of said ram cylinder and said reservoir and
- a freefill and exhaust valve adapted to engage said valve seat to stop the flow of fluid from said reservoir to said ram cyliner to provide fast approach speeds and fast return speeds of said ram whereby fluid from said reservoir can flow to said ram cylinder at low pressure when said freefill valve is open,
- pilot motor means connected to said free fill and exhaust valve for opening said free fill and exhaust valve, a plurality of circumferentially spaced orifice means in said valve seat opening directly into said ram cylinder and pump means connecting said reservoir to said cylinder through said reservoir passage and said spaced orifice means to said ram cylinder,
- and check valve means connected to said orifice means for allowing fluid to flow from said pump through said orifice means in said seat forming a path for the flow of fluid from said orifice means through said pump at high pressure,
- and pushback pistons supporting said platen
- pushback cylinders supporting said crosshead and receiving said pushback pistons and
- means selectively connecting fluid from said reservoir to said pushback cylinders and to said pilot motor means controlling said freefill valve and to said orifice means.
Dependencies are inferred from the claim text.