Fluid handling – Removable valve head and seat unit – Retained by bonnet or closure
Patent
1987-10-19
1988-11-08
Rivell, John
Fluid handling
Removable valve head and seat unit
Retained by bonnet or closure
13762517, 1376254, 251 64, F16K 11078
Patent
active
047828536
ABSTRACT:
A hot and cold water mixing valve has a sleeve formed and adapted to fit within a valve fixture such as a kitchen faucet, lavatory faucet or shower/tub control. There is a stem which is positioned within the sleeve and rotatable and reciprocal relative thereto to control discharge through the mixing valve. The sleeve has hot and cold water inlet ports and an outlet. The stem includes a piston directing flow from the sleeve inlets to the sleeve outlet. The stem also includes a stem driver formed and adapted to have an operating handle mounted thereon with the stem driver being connected to the piston by a thin rod whose diameter is substantially less than the piston outer diameter. The stem is pressure unbalanced, with the amount of unbalance being determined by the cross sectional area of the thin rod. A non-movable seal member is positioned within the sleeve with the thin rod passing through the seal member. The stem driver is attached to the thin rod on one side of the seal member, with the piston being attached to the thin rod on the other side of the seal member. Friction means is effective to provide resistance to relative movement between the stem and sleeve. There are sleeve seal members attached to the exterior of the sleeve to provide a valve closing seal when the piston is in a closed position.
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Rivell John
Stanadyne Inc.
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