IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0668979
(1984-11-07)
|
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
11 인용 특허 :
0 |
초록
▼
A gas-actuated relay valve having an outlet port alternately connectable through opposed inlet and exhaust valve seats to inlet and exhaust ports, a lower downwardly opening valve head spring-urged for normally closing the seat to the inlet port, an upper upwardly opening normally unseated valve hea
A gas-actuated relay valve having an outlet port alternately connectable through opposed inlet and exhaust valve seats to inlet and exhaust ports, a lower downwardly opening valve head spring-urged for normally closing the seat to the inlet port, an upper upwardly opening normally unseated valve head for closing the seat to the exhaust port, and coaxial inner and floating outer pistons respectively connected to the lower valve head and mounting the upper valve head, the outer piston presenting a larger area than the inner piston to actuating gas received in a common actuating gas chamber for preventing loss through the exhaust port of operating gas introduced through the inlet port by closing the upper exhaust valve seat before opening of the inlet valve seat.
대표청구항
▼
1. A gas actuated relay valve for supplying and exhausting operating gas to and from gas operated means, comprising a valve body having inlet, outlet and exhaust ports, an inlet valve seat between said inlet and outlet ports, an exhaust valve seat between said outlet and exhaust ports, an inlet valv
1. A gas actuated relay valve for supplying and exhausting operating gas to and from gas operated means, comprising a valve body having inlet, outlet and exhaust ports, an inlet valve seat between said inlet and outlet ports, an exhaust valve seat between said outlet and exhaust ports, an inlet valve head spring-urged for normally closing said inlet valve seat, an exhaust valve head seatable in and normally spaced from said exhaust valve seat, a springless floating piston and a second piston reciprocable in said body and respectively mounting said exhaust valve head and connected to said inlet valve head, an actuating gas chamber in said valve body, said floating and second pistons having piston heads exposable and responsive in said chamber to actuating gas for respectively seating said exhaust valve head and unseating said inlet valve head, and means enabling said floating piston to respond to a lower actuating gas pressure than said second piston for closing said exhaust valve seat before opening of said inlet valve seat. 2. A gas actuated relay valve for supplying and exhausting operating gas to and from gas operated means, comprising a valve body having inlet, outlet and exhaust ports, inlet and exhaust valve seats connecting said outlet port respectively to said inlet port and said exhaust port, an actuating gas chamber in said valve body, springless floating and second differential pistons reciprocable in said body and each having a piston head exposable in said chamber to actuating gas and an axially spaced smaller valve head, said floating and second piston valve heads respectively being seatable in and normally spaced from said exhaust valve seat and normally seating under spring pressure in said inlet valve seat, and means enabling said floating and second piston to respond in sequence to actuating gas pressure for closing said exhaust seat before said inlet seat opens. 3. A gas actuated relay valve according to claim 2, wherein the inlet and exhaust valve seats are vertically aligned and oppositely opening, and the differential pistons are coaxial with each other and the valve seats, and including compression spring means acting upwardly on the valve head of the second piston for normally closing the inlet valve seat. 4. A gas actuated relay valve according to claim 3, wherein the piston heads of the floating and second pistons reciprocate respectively in a piston chamber in the valve body and an upwardly opening cavity in the piston head of the floating piston, and the piston heads are exposable to actuating gas in the actuating gas chamber in the valve body between the floating piston head and a top cap of the body. 5. A gas actuated relay valve according to claim 4, wherein the piston and valve heads of the second piston are connected by an axial stem secured at one end to said valve head and slidably received at an opposite end in said piston head and therebetween axially extending through and shiftable relative to the floating piston and the valve seats. 6. A gas actuated relay valve for supplying and exhausting operating gas to and from gas operated means, comprising a valve body having inlet, outlet and exhaust ports, inlet and exhaust valve seats connecting said outlet port respectively to said inlet port and said exhaust port, an actuating gas chamber in said valve body, springless floating and second differential pistons reciprocable in said body and each having a piston head exposable in said chamber to actuating gas and an axially spaced smaller valve head, said floating and second piston valve heads respectively being seatable in and normally spaced from said exhaust valve seat and normally seating under spring pressure in said inlet valve seat, and means enabling said floating and second pistons to respond in sequence to actuating gas pressure for closing said exhaust seat before said inlet seat opens and respond in reverse sequence on bleeding of actuating gas from said body for closing said inlet seat before said outlet seat opens.
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