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Class Information
Number: 251/158
Name: Valves and valve actuation > With means to increase head and seat contact pressure > With positive reduction
Description: Devices having means to also positively return the valve or seat from its extra seat or head contacting condition.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7611122 |
Closure device for the vacuum-tight closing of an opening in a wall |
Nov. 3, 2009 |
| 7481417 |
Vacuum valve |
Jan. 27, 2009 |
| 7134642 |
Vacuum gate valve |
Nov. 14, 2006 |
| 6916009 |
Load-lock device for introducing substrates into a vacuum chamber |
Jul. 12, 2005 |
| 6899316 |
Closure device for vacuum closure of at least one opening in a wall |
May. 31, 2005 |
| 6736368 |
Gate valve |
May. 18, 2004 |
| 6629682 |
Vacuum valve |
Oct. 7, 2003 |
| 6619618 |
Gate valve |
Sep. 16, 2003 |
| 6612546 |
Gate valve with delayed retraction of counter plate |
Sep. 2, 2003 |
| 6565066 |
Gate valve |
May. 20, 2003 |
| 6474622 |
Gate valve |
Nov. 5, 2002 |
| 6431518 |
Vacuum valve |
Aug. 13, 2002 |
| 6425569 |
Gate valve |
Jul. 30, 2002 |
| 6416037 |
Vacuum pipe |
Jul. 9, 2002 |
| 6378841 |
Quarter-turn rotary plug valve with seats reciprocable during operation |
Apr. 30, 2002 |
| 6318402 |
Pneumatic tank truck closure apparatus |
Nov. 20, 2001 |
| 6298879 |
Stem valve stopper |
Oct. 9, 2001 |
| 6196520 |
Air distribution device with a shutter of the drum type, in particular for a motor vehicle |
Mar. 6, 2001 |
| 6089537 |
Pendulum valve assembly |
Jul. 18, 2000 |
| 6082706 |
Non-sliding vacuum gate valve |
Jul. 4, 2000 |
| 6056266 |
Device for closing an opening of a tank or a tubular conduit |
May. 2, 2000 |
| 5842680 |
Actuator using magnetic forces to reduce frictional forces |
Dec. 1, 1998 |
| 5799825 |
Gate seal system |
Sep. 1, 1998 |
| 5755426 |
Valve mechanism for a vacuum valve |
May. 26, 1998 |
| 5755255 |
Gate valve for regulating gas flow in semiconductor manufacturing |
May. 26, 1998 |
| 5641149 |
Gate valve |
Jun. 24, 1997 |
| 5626324 |
Non-sliding vacuum gate valve |
May. 6, 1997 |
| 5620165 |
Retracting ring seal valve |
Apr. 15, 1997 |
| 5415376 |
Gate valve |
May. 16, 1995 |
| 5415375 |
Closing system for controlling a flow with precision |
May. 16, 1995 |
| 5363872 |
Low particulate slit valve system and method for controlling same |
Nov. 15, 1994 |
| 5215120 |
Apparatus and method for reducing valve emissions |
Jun. 1, 1993 |
| 5143348 |
Easy-opening, high pressure gate valve |
Sep. 1, 1992 |
| 5116023 |
Low vibration high vacuum gate valve |
May. 26, 1992 |
| 5102054 |
Airblast fuel injector with tubular metering valve |
Apr. 7, 1992 |
| 5029516 |
Pneumatically powered valve actuator |
Jul. 9, 1991 |
| 4988075 |
Seal for valves or flanges, in particular for vacuum technology |
Jan. 29, 1991 |
| 4962889 |
Airblast fuel injection with adjustable valve cracking pressure |
Oct. 16, 1990 |
| 4938417 |
Airblast fuel injector with tubular metering valve |
Jul. 3, 1990 |
| 4785844 |
Double-seal flexible gate valve |
Nov. 22, 1988 |
| 4770392 |
Shut-off device for pipes |
Sep. 13, 1988 |
| 4753417 |
Gate valve for vacuum processing apparatus |
Jun. 28, 1988 |
| 4747577 |
Gate valve with magnetic closure for use with vacuum equipment |
May. 31, 1988 |
| 4721282 |
Vacuum chamber gate valve |
Jan. 26, 1988 |
| 4718637 |
High vacuum gate valve having improved metal vacuum joint |
Jan. 12, 1988 |
| 4700927 |
Slide gate |
Oct. 20, 1987 |
| 4627567 |
Pivotal slide valve |
Dec. 9, 1986 |
| 4597414 |
Two position control valve |
Jul. 1, 1986 |
| 4551284 |
Carburetor with a slidable throttle member controlling the air induction passage |
Nov. 5, 1985 |
| 4535811 |
Air flow control apparatus |
Aug. 20, 1985 |
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