Claims
- 1. A pause valve comprising a housing having an inlet for receiving a signal that changes from vacuum to atmospheric pressure and outlet for providing a signal,
- (a) a valve means in said housing intermediate said inlet and said outlet and having a valve seat and a moveable valve member adapted to move between open and closed positions with respect to said valve seat, said moveable valve member being biased towards its open position,
- (b) first and second control chambers formed on opposite sides of said moveable valve member acting upon said valve member, said first control chamber being connected to said inlet, both of said control chambers being balanced at vacuum when said received signal is a vacuum,
- (c) said first and second control chambers being fluidly connected by a restricted passage means, said restricted passage containing a reservoir,
- (d) said moveable valve member adapted to overcome said bias to close said valve responsive to the presence of atmospheric pressure in said first control chamber upon said received signal changes from vacuum to atmospheric pressure while retaining vacuum in said second control chamber and at said outlet,
- (e) means to allow atmsopheric pressure to bleed at a predetermiined rate through said restricted passage means from said first control chamber to said second control chamber,
- (f) means responsive to said second control chamber reaching atmospheric pressure balancing said control chambers to cause said bias to move said moveable valve member to the open position allowing atmospheric pressure from said inlet to reach said outlet.
- 2. A pause valve as defined in claim 1 wherein said restricted passage includes a fixed orifice leading to said reservoir from said first control chamber.
- 3. A pause valve, said pause valve having an inlet for receiving a signal changing from vacuum to atmospheric pressure and an outlet providing a changing signal from vacuum to atmospheric pressure after a predetermined time delay,
- (a) said pulse valve having a valve seat between said inlet and said outlet and a moveable valve member adapted to move to open and closed positions with respect to said valve seat,
- (b) first and second control chambers formed an opposite sides of said moveable valve member acting on said moveable valve member, said first and second control chambers being connected by a restricted
- (c) passage means, bias adapted to move said moveable valve member to its open position when the pressures in said control chambers are equal,
- (d) passage means connecting said first control chamber to said inlet,
- (e) said moveable valve member adapted to move to its closed position upon the increase in pressure at said inlet by a predetermined amount to cause sufficient imbalance between said first and second control chambers to overcome said spring bias,
- (f) bleed means to allow a predetermined rate of flow through said restricted passage to cause balancing of pressures in said first and second control chambers over a predetermiined period of time,
- (g) said spring bias moving said moveable valve member to its open position upon said first and second control chambers reaching balanced pressures to allow the pressure in said inlet to be communicated to said outlet.
- 4. A pause valve as defined in claim 3 wherein said restricted passage includes a reservoir and a fixed orifice leading to said reservoir from said first control chamber.
- 5. A pause valve comprising a housing having an inlet for receiving a signal that changes from vacuum to atmospheric pressue and outlet for providing a signal,
- (a) a valve means in said housing having a valve seat and a moveable valve member adapted to move between open and closed positions with respect to said valve seat, said moveable valve member being biased toward its open position,
- (b) first and second control chambers formed on opposite sides of said moveable valve member acting upon said valve member, said first control chamber being connected to said inlet, both of said control chamber being balanced at vacuum when said received signal is at steady vacuum,
- (c) said first and second control chambers being fluidly connected by a restricted passage means,
- (d) said moveable valve member adapted to overcome said bias to close said valve upon the presence of atmospheric pressure in said first control chamber when said received signal changes from vacuum to atmospheric pressure while initially retaining vacuum in said second control chamber,
- (e) means to allow atmospheric pressure to bleed at a predetermined rate through said restricted passage means from said first control chamber to said second control chamber,
- (f) means responsive to said second chamber reaching atmospheric pressure balancing said chambers to cause said bias to move said moveable valve member to the open position allowing atmospheric pressure from said inlet to reach said outlet.
Parent Case Info
This is a division of application Ser. No. 012,396 filed Feb. 9, 1987 U.S. No. 4,782,849.
US Referenced Citations (7)
Divisions (1)
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Number |
Date |
Country |
Parent |
12396 |
Feb 1987 |
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