Valve and dash-pot assembly
First Claim
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1. A valve and dash-pot assembly comprising:
- a housing having a valve seat, a valve member pivotally mounted in said housing between a valve open position and a valve closed position engagable against said seat, a dash-pot valve submerged in the fluid within said housing and including a cylinder formed with an end wall having an outlet, and having a reciprocal piston, a plunger attached to said piston and projecting outwardly of said cylinder in the path of closing movement of said valve member, a chamber in said cylinder, means for normally biasing said piston and attached plunger outwardly into an extended position, a fixed plate mounted within said cylinder between said piston and said end wall and provided with fluid passage means which directs fluid tangentailly into said chamber for developing a vortex flow in said chamber upon retraction of said piston to effect increasing resistance against said piston and plunger to progressively retard closing movement of said valve member toward said valve seat, said vortex flow with said resistance not being produced upon outward movement of said piston.
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Abstract
A dash-pot valve comprising a cylinder submerged in the fluid of a housing and having a piston attached to a plunger projecting into the path of closing movement of a pivotal valve member. A vortex chamber in said cylinder is provided with tangentially directed inlets to generate vortex flow upon retraction of said plunger and effect increasing resistance against said piston to progressively retard the closing rate of said valve member toward its seat.
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Citations
5 Claims
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1. A valve and dash-pot assembly comprising:
- a housing having a valve seat, a valve member pivotally mounted in said housing between a valve open position and a valve closed position engagable against said seat, a dash-pot valve submerged in the fluid within said housing and including a cylinder formed with an end wall having an outlet, and having a reciprocal piston, a plunger attached to said piston and projecting outwardly of said cylinder in the path of closing movement of said valve member, a chamber in said cylinder, means for normally biasing said piston and attached plunger outwardly into an extended position, a fixed plate mounted within said cylinder between said piston and said end wall and provided with fluid passage means which directs fluid tangentailly into said chamber for developing a vortex flow in said chamber upon retraction of said piston to effect increasing resistance against said piston and plunger to progressively retard closing movement of said valve member toward said valve seat, said vortex flow with said resistance not being produced upon outward movement of said piston.
- View Dependent Claims (2, 3, 4, 5)
Specification