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Dual snap action for valves

Imported: 24 Feb '17 | Published: 06 Jan '04

Larry R. Russell

USPTO - Utility Patents

Abstract

An actuating means for a valve that is both opened and closed with a snap-action. The bidirectional, bi-stable snap acting valve has adjustable resistive forces governing the snap action of the valve. The bi-stable snap action mechanism can be incorporated into the operation of the valving element or the valving actuators.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The novel features which are believed to be characteristic of the invention, both as to its structure and methods of operation, together with the objects and advantages thereof, will be better understood from the following description taken in conjunction with the accompanying drawings, wherein:

FIG. 1A shows a longitudinal section of an actuator of an open valve, where the actuator has two detents and a spring pin providing biasing detenting force is engaged in one detent;

FIG. 1B corresponds to FIG. 1A, but with the valve closed and showing the spring pin engaged in the other detent;

FIG. 2 shows a longitudinal section of the spring pin of FIGS. 1A and 1B;

FIG. 3A is a longitudinal sectional view of the actuator rod of FIG. 1A showing the detent angles and depths;

FIG. 3B is a longitudinal sectional view of the actuator rod of FIG. 1B showing the detent angles and depths;

FIG. 4A is a longitudinal sectional view of the actuator of FIG. 1A showing the forces involved in moving the piston to close the valve;

FIG. 4B is a longitudinal sectional view of the actuator of FIG. 1B showing the forces involved in moving the piston to open the valve;

FIG. 5A is a longitudinal sectional view of a double poppet valve with dual snap action in a first position;

FIG. 5B is a longitudinal sectional view of a double poppet valve with dual snap action in a second position;

FIG. 6A is a longitudinal sectional view of a spool valve with dual snap action in a first position;

FIG. 6B is a longitudinal sectional view of a spool valve with dual snap action in a second position;

FIG. 7A is a longitudinal sectional view taken through the flow passages of a gate valve with dual snap action with an open gate;

FIG. 7B is a longitudinal sectional taken through the flow passages of a gate valve with dual snap action with a closed gate;

FIG. 8A is a longitudinal sectional taken perpendicular to the flow passages of a gate valve with dual snap action with an open gate;

FIG. 8B is a longitudinal sectional taken perpendicular to the flow passages of a gate valve with dual snap action with a closed gate;

FIG. 9A shows a longitudinal section of an actuator of a valve, where the actuator has two detents and a garter spring providing biasing detenting force is engaged in one detent;

FIG. 9B shows a longitudinal section of the actuator of FIG. 9A when the valve is in the closed position and the garter spring is engaged in the other detent;

FIG. 10A is a longitudinal sectional view of the actuator of FIG. 9A showing the detent angles and depths;

FIG. 10B is a longitudinal sectional view of the actuator of FIG. 9B showing the detent angles and depths;

FIG. 11A shows a longitudinal section of an actuator of an open valve, where the actuator has an end piece made of a magnetic material attracted to a first magnet when the valve is in an open position;

FIG. 11B shows a longitudinal section of the actuator of FIG. 11A where the magnetic material is attracted to a second magnet when the valve is in the closed position;

FIG. 12A shows a longitudinal section of an actuator of an open valve, where the actuator is attached to a canted biasing spring and in a first position;

FIG. 12B shows a longitudinal section of the actuator of FIG. 12A when the valve is in the closed position and the actuator is in its second position;

FIG. 12C is a schematic illustration of a canted spring in its first and second positions;

FIG. 12D is a graphical representation of the force versus displacement behavior for actuator rod movement for the mechanism of FIGS. 12A,

12B, and

12C;

FIG. 13A shows a side view of an open ball valve mechanism configured as a cartridge;

FIG. 13B is a side view of the ball valve of FIG. 13A when the valve is in the closed position;

FIG. 14 (broken apart for clarity into FIG.

14A and FIG. 14B) is a longitudinal half section along section line

14

14 of FIG. 13B; and

FIG. 15 is a longitudinal section along section line

15

15 of FIG. 13B;

FIG. 16 is an external view of the ball valve cartridge interior elements without some of the outer elements shown, corresponding to FIG. 13A, showing the configuration of the flat face of the ball and the camming actuator;

FIG. 17 is a top view of an alternate ball of the ball valve shown in FIG. 16, where for clarity the detents are not shown;

FIG. 18 is a partially exploded view of the valve cartridge shown in FIG. 13B;

FIG. 19 is a longitudinal half sectional view of a closed ball valve having a coil spring providing biasing force engaged in detents of the top face of the ball;

FIG. 20 is a longitudinal half sectional view of the ball valve shown in FIG. 19 in an open position;

FIG. 21 is a partially exploded view of the valve shown in FIG. 19;

FIG. 22 is an external view of a ball valve cartridge interior elements without some of the outer elements shown and one element in section, where the actuator has two detents and a spring pin providing biasing detenting force engaged in one detent;

FIG. 23 shows a longitudinal half section of an open ball valve having a garter spring providing biasing detenting force engaged in a first detent on the actuator;

FIG. 24 shows a partial longitudinal half section of the ball valve of FIG. 23 with the ball in a closed position;

FIG. 25A shows the actuator of an open ball valve, where a magnet on the body of the valve is attracted to a first element of magnetic material to provide biasing detenting force; and

FIG. 25B shows the actuator of the ball valve of FIG. 25A in a closed position, where a magnet on the body of the valve is attracted to a second element of magnetic material.

Claims

1. A ball valve comprising

2. The valve of claim 1, wherein said ball, sealing means, support means, camming means, the detenting mechanism, and actuating means are assembled together to form a modular valve cartridge that fits within the tubular valve body.

3. The valve of claim 1, wherein the camming means comprises:

4. The valve of claim 3, wherein each camming groove extends radially parallel to the flat face of the ball at an angle to the flow axis of said ball through hole.

5. The valve of claim 3, wherein each camming groove has one or more mirror-image overtravel relief grooves to accommodate overtravel of said camming pins as the actuator moves from one end position to the other end position, each overtravel relief groove corresponding to one of the ball end positions, wherein said overtravel relief grooves serve to permit lost motion between said ball and said camming means, thereby preventing said ball from rotating past its said other end position.

6. The valve of claim 1, wherein said actuating means is a force and pressure responsive annular piston.

7. The valve of claim 6, wherein said piston is subjected to a valve inlet pressure on a first face and a bias force on a second face obverse to said actuating means first face, wherein said bias force includes a gas pressure force or a bias spring force or both.

8. The valve of claim 6, wherein said piston is subjected to a valve inlet pressure on a first face and a bias force on a second face obverse to said actuating means first face, wherein said bias force is a gas pressure force.

9. The valve of claim 8, wherein said bias force is adjustable by varying the gas pressure.

10. The valve of claim 1, wherein said detenting mechanism is a spring-pin mounted in the support means for said ball and engaging one or more detents located on a surface of said ball.

11. The valve of claim 10, wherein the force necessary to overcome the interaction of the spring-pin with the detent on the ball is determined by selecting a spring preload and a spring rate of the spring pin and a slope and a depth of the detent.

12. The valve of claim 1, wherein said detenting mechanism is a coil spring mounted in the support means for said ball and engaging one or more detents on said ball.

13. The valve of claim 12, wherein the force necessary to overcome the interaction of the coil spring with the detent on the ball is determined by selecting a spring rate of the coil spring and a slope and a depth of the detent.

14. In a two position ball valve with coupled actuator, the improvement comprising: