Spring loaded plug valve
AssigneeTorr Vacuum Products, Inc.
InventorArthur E. Norman
Life of this patent
Estimating the term…
Abstract
A valve is provided which includes a poppet enclosed in a plug of plastic material, such as Teflon, and which is biased against a seat by a compression spring so that a positive seal is provided even in the presence of cold flow in the plastic plug. A valve stem engages the poppet, and it serves to pull the poppet and plug away from the seat against the force of the spring when the valve is opened, and to force the poppet and plug against the seat when the valve is closed. The valve is closed by a pressurized fluid, such as air, and is opened by means of a spring when the air pressure is removed. The Teflon plug is provided with a sharp corner which contacts a conical seat creating a seal when the valve is closed. The sharp corner of the plug wipes the seat of the debris as the valve is opened and closed.
Claims7
A valve assembly including:
- a housing defining an inlet and an outlet, and further defining a seat positioned within the housing between the inlet and the outlet;
- a poppet valve mounted in the housing and movable between an open position displaced from said seat and a closed position;
- a plastic plug member secured to said poppet valve for engaging said seat in sealed relationship therewith when the poppet valve is closed;
- a piston rod reciprocally movable in said housing;
- means coupling one end of said piston rod to said poppet valve;
- a piston slidable on said piston rod;
- a stop mounted on said piston rod;
- first resilient means biasing said piston against said stop for moving said piston rod to a first position in said housing and for moving said poppet valve to its open position;
- means for introducing a pressurized fluid into said housing to move said piston along said piston rod against the bias of said first resilient means and away from said stop to release said piston rod;
- and second resilient means for moving said piston rod from said first position independently of said piston for forcing said poppet valve to its closed position when said piston rod is released and for maintaining a positive force on said poppet valve in its closed position in the presence of any deformation thereof.
Dependencies are inferred from the claim text.