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Class 137/485 - Pilot or servo controlled


Subclass of Class 137 - Fluid handling
Definition: Apparatus within ... in which the means sensing a change
No. of patents: 10
Last issue date: 10/23/2007


NumberTitleIssue Date
7284563Surge relief apparatus and method
A surge relief apparatus for sensing, tracking and responding to pressure changes in a flow system. The apparatus includes a fluid storage tank that is in fluid communication with the flow system. The apparatus also includes a control valve that is connected to the ...
10/23/2007
7150777Method for recovery of by product gas in vacuum heat treatment
A method and apparatus for the recovery of by product gases used in a vacuum metal treatment process or other gas treatments processes are disclosed. The present invention is normally carried out in a process chamber in the last stage of the process, after vacuum pr...
12/19/2006
6820855Air flow control valve
An air flow control valve including a valve body having an internal cavity and an inlet and outlet in flow communication with the internal cavity, the axes of the inlet and outlet being aligned at substantially 90° to each other, a valve seat located within the cav...
11/23/2004
6516824Apparatus and method for metering delivery quantity of ultra-low temperature liquefied gas
In the apparatus or method in accordance with the present invention, an ultra-low temperature liquefied gas is circulated in a flow path from a storage element 101 to the storage element 101, the loading quantity of flow and the return quantity of flow to...
02/11/2003
6371347Air switch and palm guide for papermaking machinery
An air switch including a housing, a lubrication port, a first air inlet port and an exhaust port is disclosed. The housing includes a chamber. The lubrication port is disposed to deliver lubrication into the chamber. The first air inlet port is disposed ...
04/16/2002
5937894System and method for transporting a fluid susceptible to hydrate formation
Method for producing and/or transporting by pipeline, from a location such as a reservoir to a point of destination, a multi-phase fluid susceptible to the formation of hydrates under given thermodynamic conditions. During production and/or transportation...
08/17/1999
5368067Gas storage and recovery system
A system for recovering and recycling gases is disclosed having, in one aspect, inlet and outlet flow lines and controllers with an inflatable enclosure which, in one aspect, has a series of one or more inflatable rib stiffeners which, in one aspect, are ...
11/29/1994
5070900Safety valve actuator assembly
An emergency shut-down system to close a gate valve in a pipeline and therefore terminate flow. The closing action is initiated when a pilot valve senses pressure in the pipeline outside predetermined limits. This reduces the signal pressure in the system...
12/10/1991
4261387Pipeline surge relief system
A pipeline surge relief system including a relief valve of the type that opens when line pressure exceeds pressure in a pilot chamber. A bleed valve, which is operable to evacuate the pilot chamber is opened when pipeline pressure acting against a diaphra...
04/14/1981
3972364Pressure surge relief system
A pressure surge relief system including a valve which is opened to relieve the pipeline when line pressure overcomes a pilot chamber pressure. A pilot load duct with a variable orifice device therein connects the chamber to the pipeline. In the event of ...
08/03/1976
 
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