Valves
OwnerHakan E. O. Jeppssoninventor
Life of this patent
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Abstract
A leakproof valve has a valve housing which consists of an upper portion and a lower portion each connectable to a conduit. Between these portions there is a communication which has a conical valve seat with two sealing rings of different diameters. Two outer cone parts in a three-way divided valve cone cooperate with the sealing rings of the valve seat for forming double seals betwen the upper and lower portions of the valve housing. The third cone part is located between and movable with respect to the two oute cone parts. On closure of the communication, the third cone part will substantially abut against the seat between the sealing rings such that no cavity is formed here. A subsequent shifting of the third cone part with respect to the two outer cone parts opens a communication from the region between the seals to a bleeder outlet.
Claims8
A leak-proof valve comprising a housing having an upper portion, a lower portion and a valve seat defining an axial passage therebetween;
- two valve heads axially movable with respect to the valve seat between a closed position in which the valve heads bear against spaced-apart ring portions of the valve seat, and an open position in which the valve heads are axially cleared from the valve seat, said valve heads being axially spaced apart to define a leakage cavity therebetween;
- a bleeder outlet connected to the leakage cavity;
- a third valve head axially movable within the leakage cavity and configured to conform to the valve seat surface between the two ring portions thereof;
- and means for moving the third valve head for opening a communication from a region between the two ring portions of the valve seat to the bleeder outlet first after the two valve heads are moved into the closed position, and for closing said communication before the two valve heads are moved toward the open position.
A leak-proof valve as defined in claim 8, wherein the pistons have piston surfaces of different sizes, and the piston of the smaller piston surface is more weakly spring-biased than, and has a restricted length of travel with respect to, the piston having the larger piston surface.
Dependencies are inferred from the claim text.