US 4,846,221 AGranted

Ball valve with built-in check valve

AssigneeKitz Corporation

InventorTonaharu Kanemaru

Life of this patent

Estimating the term…

Loading patent…

Abstract

A ball valve with a built-in check valve includes a valve casing having a passageway for a fluid, a ball having a through hole formed therein, also having a valve seat formed inside thereof at a position in the vicinity of one end of the through hole, and rotatably housed in the valve casing so that the through hole is capable of communicating with the passageway, a guide bush provided within the through hole for guiding the check valve, a spiral spring wound on the guide bush for biasing the check valve in the direction of forming a seal contact between the check valve and the valve seat, and rubber or resin damping members attached to the check valve. The check valve is received within the through hole for cutting off the communication between the passageway and the through hole and preventing a counter flow of the fluid, and has a sealing contact portion and a shoulder portion. The shoulder portion of the check valve abuts against an end face of the guide bush when the check valve has been retracted by pressure of the fluid exerted on the check valve against the biasing force of the spiral spring. The sealing contact portion of the check valve is brought into sealing contact with the valve seat by the biasing force of the spiral spring.

Claims12

Dependent claims

A ball valve with a built-in check valve, comprising:

a valve casing having a passageway for a fluid and having a stem housing portion for housing a valve stem, a valve handle detachably attachable on said valve stem, said stem housing portion having an outer groove, said valve handle having an inner groove at a position corresponding to a position of said outer groove when the valve handle is detachably attached on said valve stem, a split type snap ring received in said inner and outer grooves, said snap ring being received, when radially contracted, on the bottom of said outer groove and being received, when radially expanded, on the bottom of said inner groove;
a ball having a through hole formed therein and having a valve seat formed inside thereof at a position in the vicinity of one end of the through hole thereof and being rotatably house in said valve casing and attached to said valve stem, the through hole of said ball and the fluid passageway of said valve casing being capable of communicating with each other by substantially 90 degree rotation of said ball in a normal direction through said valve stem and being capable of cutting off their communication by substantially 90 degree rotation of said ball in a reverse direction through said valve stem;
a built-in check valve received within the through hole of said ball for cutting off the communications between the fluid passageway and the through hole and preventing a counter flow of the fluid, the built-in check valve having a valve body which has a sealing contact portion and a shoulder portion;
a guide bush provided within the through hole of said ball for guiding said valve body of said check valve;
a spring disposed on said guide bush for biasing said check valve in the direction of forming a seal contact between said sealing contact portion of said check valve and said valve seat of said ball and allowing said shoulder portion of said valve body of said check valve to abut against an end face of said guide bush when said valve body of said check valve has been retracted by pressure of the fluid exerted on said check valve against the biasing force of said spiral spring;
and
damping members attached to said sealing contact portion and said shoulder portion of said value body of said check valve.

4 more elements

A ball valve with built-in check valve, comprising:

a valve casing having a fluid passageway therethrough;
a ball valve member mounted to undergo angular displacement within the valve casing between open and closed positions, the ball valve member having therein a through-hole positioned to communicate with the fluid passageway in the valve casing when the ball valve member is in the open position and to shut off communication with the fluid passageway in the valve casing when the ball valve member is in the closed position;
a check valve mounted within the through-hole of the ball valve member for permitting fluid to flow in one direction through the through-hole and preventing fluid flow in the counter direction, the check valve comprising a movable check valve member movable between a closed position wherein the check valve member sealingly engages with a valve seat formed on the ball valve member to thereby prevent fluid flow in the counter direction and an open position wherein the check valve member is spaced from the valve seat to thereby permit fluid flow in the one direction, guiding means for guiding the movement of the check valve member and engageable with the check valve member when the same moves to its fully open position, spring means for urging the check valve member toward its closed position, and damping means for damping impact of the check valve member with the valve seat when the check valve member moves to its closed position and for damping impact of the check valve member with the guiding means when the check valve member moves to its fully open position;
and a valve stem turnably mounted within the valve casing and having one end connected to the ball valve member to effect angular displacement thereof in response to turning of the valve stem and another end projecting out of the valve casing for detachable attachment to a valve handle for use in turning the valve stem, the valve stem having means for visually indicating whether the ball valve member is in the open or closed position.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 07/192,598Filed 9 May 1988
Priority: JP 62-75240[U]21 May 1987
Granted: 11 Jul 1989
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

F16K 15/1848
Combined check valves and actuated valves: check valves combined with valves having a rotating tap or cock
F16K 5/0605
With plugs having spherical surfaces; Packings therefor: with particular plug arrangements, e.g. particular shape or built-in means
Y10T 137/785
Direct response valves [i.e., check valve type]: with retarder or dashpot
Y10T 137/8803
One valve head provides seat for other head: also carries head of other valve