Diaphragm latch valve

• US 20070000671A1
• Filed: 06/30/2005
• Published: 01/04/2007
• Est. Priority Date: 06/30/2005
• Status: Active Grant

• Current Assignee: Victaulic Company
• Original Assignee: Victaulic Company of America
• Inventors: Reilly, William, Banis, Joseph, Blease, Kevin
• Granted Patent: US 7,543,653 B2
• Time in Patent Office: Days
• US Class Current: 169/17
• CPC Class Codes: A62C 35/68 Details, e.g. of pipes or valve systems valves in general F16K
• CPC Class Codes: F16K 15/1821 for check valves with a hinged or pivoted closure member
• CPC Class Codes: F16K 31/563 for rotating or pivoting valves
• CPC Class Codes: Y10T 137/8275 Indicator element rigidly carried by the movable element whose position is indicated

Abstract

A valve for fire suppression sprinkler systems is disclosed. The valve has a chamber with an inlet and an outlet. A closure member, positioned within the chamber, is movable to close and open the inlet. A latch engages the closure member to hold it in the closed position. The latch also engages a deformable diaphragm. The diaphragm deforms in response to pressure applied to it and allows the latch to move between a latched position engaged with the closure member and an unlatched position away from the closure member. When the diaphragm is depressurized it allows the latch to move and disengage from the closure member, which opens under fluid pressure from the inlet and allows fluid to flow through the valve.

Claims

1. A valve for controlling fluid flow, said valve comprising:

a chamber having an inlet and an outlet;

a closure member movably mounted within said chamber, said closure member being movable between a closed position blocking said inlet, and an open position away from said inlet;

a flexible diaphragm deformable in response to fluid pressure applied against said diaphragm; and

a latch movably mounted within said chamber, said latch having a first portion engageable with said diaphragm and a second portion engageable with said closure member, said latch being engaged with said closure member by said diaphragm deforming in response to said fluid pressure and thereby maintaining said closure member in said closed position, said latch moving out of engagement with said closure member upon deformation of said diaphragm in response to a release of said fluid pressure thereby allowing said closure member to move into said open position.

2. A valve according to claim 1, further comprising a second chamber, said diaphragm forming a fluid tight interface between said first and second chambers.

3. A valve according to claim 2, further comprising an actuator in fluid communication with said second chamber, said actuator pressurizing and depressurizing said second chamber in response to a predetermined signal.

4. A valve for controlling fluid flow, said valve comprising:

a first chamber having an inlet and an outlet;

a closure member positioned within said first chamber, said closure member being movable between a closed position blocking said inlet, and an open position away from said inlet;

a second chamber having a flexible diaphragm, said diaphragm comprising a fluid tight interface between said first and second chambers, said diaphragm being deformable upon pressurization and depressurization of said second chamber; and

a latch movably positioned within said first chamber, said latch having a first portion engageable with said diaphragm and a second portion engageable with said closure member, said diaphragm deforming and moving said latch into engagement with said closure member and thereby maintaining said closure member in said closed position when said second chamber is pressurized, said diaphragm deforming and allowing said latch to move out of engagement with said closure member when said second chamber is depressurized thereby allowing said closure member to move into said open position.

5. A valve according to claim 4, wherein said closure member is pivotably movable between said open and said closed positions.

6. A valve according to claim 5, comprising a biasing element biasing said closure member into said closed position.

7. A valve according to claim 4, wherein said latch is pivotably movable between a first position engaging said closure member and a second position disengaged from said closure member.

8. A valve according to claim 7, comprising a biasing element biasing said latch into said position disengaged from said closure member.

9. A valve for controlling fluid flow, said valve comprising:

a first chamber having an inlet and an outlet;

a closure member pivotably mounted within said first chamber, said closure member being movable between a closed position blocking said inlet, and an open position pivoted away from said inlet;

a second chamber having a flexible diaphragm, said diaphragm being positioned between said first and second chambers, said diaphragm being deformable upon pressurization and depressurization of said second chamber; and

a latch pivotably mounted within said first chamber, said latch having a first portion engageable with said diaphragm and a second portion engageable with said closure member, said latch engaging and maintaining said closure member in said closed position when said second chamber is pressurized, said latch moving out of engagement with said closure member when said second chamber is depressurized thereby allowing said closure member to move into said open position.

10. A valve according to claim 9, further comprising a conduit extending between said inlet and said second chamber, said conduit pressurizing said second chamber to a pressure substantially the same as pressure in said inlet.

11. A valve according to claim 9, further comprising an actuator in fluid communication with said second chamber, said actuator pressurizing and depressurizing said second chamber in response to a predetermined signal indicative of a fire condition.

12. A valve according to claim 11, wherein said signal comprises a pressure change within said actuator.

13. A valve according to claim 9, further comprising a biasing element biasing said closure member into said closed position.

14. A valve according to claim 13, wherein said biasing element comprises a spring engaging said closure member.

15. A valve according to claim 9, further comprising a biasing element biasing said latch out of engagement with said closure member.

16. A valve according to claim 15, wherein said biasing element comprises a spring engaging said latch.

17. A fire suppression sprinkler system comprising:

a plurality of sprinkler heads;

a piping network in fluid communication with said sprinkler heads;

a source of pressurized water in fluid communication with said piping network;

a valve in fluid communication with said piping network and said pressurized water source, said valve controlling fluid flow to said sprinkler heads and comprising;

a first chamber having an inlet and an outlet;

a closure member positioned within said first chamber, said closure member being movable between a closed position blocking said inlet, and an open position away from said inlet;

a flexible diaphragm deformable in response to fluid pressure applied against said diaphragm;

a latch movably mounted within said chamber, said latch having a first portion engageable with said diaphragm and a second portion engageable with said closure member, said latch being engaged with said closure member by said diaphragm deforming in response to said fluid pressure and thereby maintaining said closure member in said closed position, said latch moving out of engagement with said closure member upon deformation of said diaphragm in response to a release of said fluid pressure thereby allowing said closure member to move into said open position; and

an actuator controlling pressurization of said diaphragm for opening said valve in response to a parameter indicative of a fire condition.

18. A sprinkler system according to claim 17, wherein said valve further comprises a second chamber, said diaphragm forming a fluid tight interface between said first and second chambers.

19. A sprinkler system according to claim 18, further comprising a conduit providing fluid communication between said pressurized water source and said second chamber, said conduit pressurizing said second chamber with water from said pressurized water source.

20. A sprinkler system according to claim 18, further comprising a conduit extending between said piping network and said actuator, said piping network being pressurized with a gas, said actuator depressurizing said second chamber in response to a decrease in gas pressure within said piping network.