Claims
- 1. A valve and operating mechanism therefor comprising:
- a main body casing having a cavity therein;
- first and second ports extending through said main body casing for respectively admitting fluid to and discharging fluid from said main body;
- means forming a respective first and second annular passage at the ends of said cavity for providing communication between said cavity and a respective one of said first and second ports;
- a pressure responsive annular packing at each of said annular passages to open and close the passage upon application and removal of pressure to effect expansion and contraction of said packing;
- means for adding pressure to said cavity; and
- means for selectively applying pressure to said annular packings to:
- a) open the first passage between said first port and said cavity and close the second passage between said second port and said cavity to admit fluid into said cavity,
- b) to close said first and second passages to contain fluid in said cavity for application of pressure from said pressure adding means to the fluid contained in the cavity, and
- c) closing said first passage and opening said second passage to permit the pressure treated fluid to exit from said cavity through said second port.
Priority Claims (1)
Number |
Date |
Country |
Kind |
4-047830 |
Feb 1992 |
JPX |
|
Parent Case Info
This is a division, of application Ser. No. 08/009,880, filed Jan. 27. 1993, now abandoned.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
3937440 |
MacGregor et al. |
Feb 1976 |
|
4085942 |
Yoshida et al. |
Apr 1978 |
|
Foreign Referenced Citations (2)
Number |
Date |
Country |
672023 |
Oct 1963 |
CAX |
0029396 |
May 1981 |
EPX |
Divisions (1)
|
Number |
Date |
Country |
Parent |
9880 |
Jan 1993 |
|