Pneumatic control valve
First Claim
Patent Images
1. A pulse valve which is adapted to a device for moving a part thereof, comprising:
- a pulse housing having a pulse chamber with a longitudinal axis, the pulse chamber having a front, a back and a sidewall, there being a piston opening through the housing at the front of the chamber;
a piston means reciprocable in the pulse chamber along the axis thereof, the means having a piston portion slidingly passing through the piston opening, the piston portion having a piston sidewall, a front end and a back end, the piston portion being longer than the distance from the front to the back of the pulse chamber, and the piston means having an extension from the piston sidewall toward the chamber sidewall, the extension being within the pulse chamber and transversely dividing the pulse chamber into a pair of smaller chambers separated by the extension, one of the ends of the piston portion adapted to engage and move the part of the device when the extension correspondingly moves in the pulse chamber in the direction of the part;
an inlet disposed in the pulse housing and communicating with at least one of the smaller chambers, and through which gas is circulated to the at least one of the chambers; and
means for allowing the circulation of gas between the smaller chambers to equalize a force suddenly exerted against the extension by a differential gas pressure in the smaller chambers.
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Accused Products
Abstract
The present invention is a pulse valve which imparts a force to a piston means for a limited duration of time or over a given distance. This pulse valve can be incorporated into a manual control valve. The manual control valve is particularly useful in an air parking brake control system for an air parking brake system.
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Citations
47 Claims
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1. A pulse valve which is adapted to a device for moving a part thereof, comprising:
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a pulse housing having a pulse chamber with a longitudinal axis, the pulse chamber having a front, a back and a sidewall, there being a piston opening through the housing at the front of the chamber; a piston means reciprocable in the pulse chamber along the axis thereof, the means having a piston portion slidingly passing through the piston opening, the piston portion having a piston sidewall, a front end and a back end, the piston portion being longer than the distance from the front to the back of the pulse chamber, and the piston means having an extension from the piston sidewall toward the chamber sidewall, the extension being within the pulse chamber and transversely dividing the pulse chamber into a pair of smaller chambers separated by the extension, one of the ends of the piston portion adapted to engage and move the part of the device when the extension correspondingly moves in the pulse chamber in the direction of the part; an inlet disposed in the pulse housing and communicating with at least one of the smaller chambers, and through which gas is circulated to the at least one of the chambers; and means for allowing the circulation of gas between the smaller chambers to equalize a force suddenly exerted against the extension by a differential gas pressure in the smaller chambers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A manual control valve comprising:
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a housing having a front portion and a pulse portion; a manual activation means whereby the control valve can be manually operated; a control chamber in the housing between the front portion and the pulse portion of the housing; a front inlet port into the front portion of the housing communicating with the control chamber; a front outlet port from the front portion of the housing communicating with the control chamber; a back port from the pulse portion of the housing communicating with the control chamber; a shaft bore communicating through the front portion of the housing; a shaft slidingly located within the shaft bore, the shaft having a front end and back end, the front end being operatively connected to the manual activation means, the back end passing into the control chamber; a sealing means between the shaft and the shaft bore; a front valve seat located between the front inlet port and the control chamber; a back valve seat located between the back outlet port and the control chamber; a valve seating means connected to the shaft within the control chamber whereby the shaft can move toward the front portion until the valve seating means seats on the front valve seat and prevents communication between the front inlet port with the control chamber, and the shaft can move toward the pulse portion until the valve seating means seats on the back valve seat and prevents communication between the back outlet port with the control chamber; a pulse chamber in the pulse portion of the housing, the pulse chamber having a front, a back and a pulse chamber sidewall, there being an inlet through the housing to the pulse chamber and a piston opening through the front end of the pulse chamber and into the control chamber coaxial with the shaft; a piston means having a piston portion slidingly passing through the piston opening, the piston portion having a piston sidewall, a front end and a back end, and the piston portion being longer than the distance from the front to the back of the pulse chamber, and the piston means having an extension from the piston sidewall toward the pulse chamber sidewall, the extension being within the pulse chamber, and there being a predetermined clearance area between the chamber sidewall and the extension, the pulse chamber being divided into a front pulse chamber and a back pulse chamber by the extension, there being sufficient distance between the front end of the piston means and the extension so that when the piston means slides toward the front of the pulse chamber the front end of the piston protrudes into the control chamber past the location which the back end of shaft must be located for the seating means to seat on the back valve seat. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. An air parking brake control system for an air parking brake system comprising:
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a means to supply compressed air;
tractor pneumatic brake actuators;
trailer pneumatic brake actuators;a tractor-trailer park control valve (PV) having an inlet port, an outlet port and an exhaust port; a tractor protection control valve (TPCV'"'"') further comprising, a housing having a front portion and a pulse portion; a manual activation means whereby the control valve can be manually operated; a control chamber in the housing between the front portion and the pulse portion of the housing; a front inlet port into the front portion of the housing communicating with the control chamber; a front outlet port from the front portion of the housing communicating with the control chamber; an exhaust port from the pulse portion of the housing communicating with the control chamber; a shaft bore communicating through the front portion of the housing; a shaft slidingly located within the shaft bore, the shaft having a front end and back end, the front end being operatively connected to the manual activation means, the back end passing into the control chamber; a sealing means between the shaft and the shaft bore; a front valve seat located between the front inlet port and the control chamber; a back valve seat located between the exhaust port and the control chamber; a valve seating means connected to the shaft within the control chamber whereby the shaft can move toward the front portion until the valve seating means seats on the front valve seat and prevents communication between the front inlet port with the control chamber, and the shaft can move toward the pulse portion until the valve seating means seats on the back valve seat and prevents communication between the exhaust port with the control chamber; a pulse chamber in the pulse portion of the housing, the pulse chamber having a front, a back and a pulse chamber sidewall, there being an inlet through the housing to the pulse chamber and a piston opening through the front end of the pulse chamber and into the control chamber coaxial with the shaft; a piston means having a piston portion slidingly passing through the piston opening, the piston portion having a piston sidewall, a front end and a back end, and the piston portion being longer than the distance from the front to the back of the pulse chamber, and the piston means having an extension from the piston sidewall toward the pulse chamber sidewall, the extension being within the pulse chamber, and there being a predetermined clearance area between the chamber sidewall and the extension, the pulse chamber being divided into a front pulse chamber and a back pulse chamber by the extension, there being sufficient distance between the front end of the piston means and the extension so that when the piston means slides toward the front of the pulse chamber the front end of the piston protrudes into the control chamber past the location which the back end of the shaft must be located for the seating means to seat on the back valve seat; a control system line connecting the PV inlet port to the TPCV'"'"' front inlet port; a supply line communicating from the means to supply compressed air to the control system line; a brake line from the PV outlet port communicating to tractor pneumatic brake actuators; a return line connecting the brake line to the pulse chamber inlet of the TPCV'"'"'; a trailer line from TPCV'"'"' front outlet port communicating to the trailer pneumatic brake actuators. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42)
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43. A valve which is adaptable to a device for moving a part thereof, comprising:
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(a) a housing having a chamber with a longitudinal axis; (b) a gas impervious member reciprocable in the chamber along the axis thereof, the member being generally in a plane which is normal to the axis to transversely divide the chamber into a pair of smaller chambers separated by the member; (c) an inlet disposed in the housing and communicating with at least one of the smaller chambers, and through which gas is circulated to the at least one of the chambers; (d) means coupled to the member and movable, in unison, therewith to engage and move the part when the member correspondingly moves in the direction of the part; (e) means for allowing the circulation of gas, under pressure, between the smaller chambers to equalize a force suddenly exerted against the member in one of the smaller chambers by differential gas pressure in the smaller chambers. - View Dependent Claims (44, 45, 46, 47)
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Specification