Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Browse by Category: Main > Engineering
Class Information
Number: 137/492.5
Name: Fluid handling > Line condition change responsive valves > Pilot or servo controlled > Fluid pressure type > Single acting fluid servo > Spring biased
Description: Devices in which the constantly acting pressure or bias is a spring.










Patents under this class:
1 2 3 4

Patent Number Title Of Patent Date Issued
8689895 Pilot valve, method of using, and fluid system equipped therewith Apr. 8, 2014
8550101 System and method for hydraulically managing fluid pressure downstream from a main valve between set points Oct. 8, 2013
8490646 Diaphragm valve with mechanical pressure relief Jul. 23, 2013
8474480 Actuator control valve Jul. 2, 2013
8474479 Multifunction relief valve and airplane emergency hydraulic power source unit having the same Jul. 2, 2013
8381761 Pressure management control valve assembly Feb. 26, 2013
8375981 Pressure control valve Feb. 19, 2013
8365763 Pilot-controlled pressure limiting valve Feb. 5, 2013
8360097 Valve actuator and throttle valve assembly employing the same Jan. 29, 2013
8286662 Switching valve with slider Oct. 16, 2012
8251089 Relief system for process fluids under pressure Aug. 28, 2012
8240328 Automatic fluid spill prevention and shut off safety valve Aug. 14, 2012
8210196 Vacuum control system and vacuum control method Jul. 3, 2012
8210201 Regulator valve with locking system Jul. 3, 2012
8162068 Pilot valve, method of using, and fluid system equipped therewith Apr. 24, 2012
8162619 Method for controlling the discharge pressure of an engine-driven pump Apr. 24, 2012
8047226 Pressure relief valves and pneumatic control systems Nov. 1, 2011
7789102 Air compressor having a pneumatic controller for controlling output air pressure Sep. 7, 2010
7677267 Dunnage airbag inflation circuit Mar. 16, 2010
7565915 Feed pressure valve Jul. 28, 2009
7513269 Hydraulic control system for automatic transmission Apr. 7, 2009
7467642 Soft ventable relief valve Dec. 23, 2008
7234487 Cross-over relief valve assembly for use in bi-directional circuit Jun. 26, 2007
7204266 Pilot-operated pressure shut-off valve Apr. 17, 2007
7159610 Relief valve Jan. 9, 2007
7147430 Pneumatic valve control using downstream pressure feedback and an air turbine starter incorporating the same Dec. 12, 2006
7134447 Gas pressure regulator Nov. 14, 2006
7086841 Air compressor with inlet control mechanism and automatic inlet control mechanism Aug. 8, 2006
7066710 Pneumatic valve control having improved opening characteristics and an air turbine starter incorporating the same Jun. 27, 2006
7044156 Pipeline protection system May. 16, 2006
6986362 Pilot operated relief valve Jan. 17, 2006
6820641 Internally piloted dome loaded regulator Nov. 23, 2004
6814837 Controlled gas supply line apparatus and process for infilm and onfilm defect reduction Nov. 9, 2004
6802339 Assembly having a spring-loaded tandem control valve Oct. 12, 2004
6789566 Safety contrivance for gas-using device Sep. 14, 2004
6772785 Demand valve for breathing apparatus Aug. 10, 2004
6651686 Valve actuator system Nov. 25, 2003
6644346 Spring-loaded tandem control valve Nov. 11, 2003
6631731 Flow regulator for water pump Oct. 14, 2003
6604538 Adjustable fluid flow regulator with adjustment limit Aug. 12, 2003
6604541 Pilot operated rupture disk Aug. 12, 2003
6581630 Pressure control valve Jun. 24, 2003
6412510 Wellhead safety valve control system Jul. 2, 2002
6308753 System for loading and unloading fluid tanks containing hazardous fluids Oct. 30, 2001
6286534 Pressure relief valve system including a pilot valve having a radial damper mechanism Sep. 11, 2001
6237693 Failsafe safety valve and method May. 29, 2001
6220280 Pilot operated relief valve with system isolating pilot valve from process media Apr. 24, 2001
6202681 Vacuum pressure control system Mar. 20, 2001
6178997 Intelligent pressure regulator Jan. 30, 2001
6116268 Wellhead safety valve control system Sep. 12, 2000

1 2 3 4










 
 
  Recently Added Patents
Formwork release composition and use thereof
Device, system, and method for logging near field communications tag interactions
Method for production of a thermoelectric apparatus
HSP20 inhibits amyloidogenesis and neurotoxicity
Plants and seeds of hybrid corn variety CH336383
System and method for detecting an earth ground fault of an external power supply connected to a vehicle
Digital broadcast receiver and method for processing caption thereof
  Randomly Featured Patents
Third-party-secured zones on web pages
Process and apparatus for the in-situ decontamination of ground water containing heavy metals
Game board
Method for multiplex driving a passive liquid crystal display (LCD) using modulated pulse widths
Method for dispensing reagent onto substrate
Ink jet recording system and method of preserving recording head
Method for designing a colorimeter having integral illuminant-weighted CIE color-matching filters
Shape optimization to solve inverse problems and curve/model fitting problems
Apparatus and method for event tagging for multiple audio, video, and data streams
Managing secure sharing of private information across security domains using multiple caseloads