GB1466022A - Pilot-controlled pressure relief valves - Google Patents

Pilot-controlled pressure relief valves

Info

Publication number
GB1466022A
GB1466022A GB296975A GB296975A GB1466022A GB 1466022 A GB1466022 A GB 1466022A GB 296975 A GB296975 A GB 296975A GB 296975 A GB296975 A GB 296975A GB 1466022 A GB1466022 A GB 1466022A
Authority
GB
United Kingdom
Prior art keywords
valve
piston
ball
pilot
pilot valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB296975A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ZF Friedrichshafen AG
Original Assignee
ZF Friedrichshafen AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE19742403007 external-priority patent/DE2403007C2/en
Priority claimed from DE2500537A external-priority patent/DE2500537C2/en
Priority claimed from DE2500480A external-priority patent/DE2500480C2/en
Application filed by ZF Friedrichshafen AG filed Critical ZF Friedrichshafen AG
Publication of GB1466022A publication Critical patent/GB1466022A/en
Expired legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16KVALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/04Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
    • F16K17/10Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with auxiliary valve for fluid operation of the main valve
    • F16K17/105Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with auxiliary valve for fluid operation of the main valve using choking or throttling means to control the fluid operation of the main valve
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16KVALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00Actuating devices; Operating means; Releasing devices
    • F16K31/12Actuating devices; Operating means; Releasing devices actuated by fluid
    • F16K31/36Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor
    • F16K31/38Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor in which the fluid works directly on both sides of the fluid motor, one side being connected by means of a restricted passage and the motor being actuated by operating a discharge from that side
    • F16K31/383Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor in which the fluid works directly on both sides of the fluid motor, one side being connected by means of a restricted passage and the motor being actuated by operating a discharge from that side the fluid acting on a piston
    • F16K31/3835Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor in which the fluid works directly on both sides of the fluid motor, one side being connected by means of a restricted passage and the motor being actuated by operating a discharge from that side the fluid acting on a piston the discharge being effected through the piston and being blockable by a mechanically-actuated member making contact with the piston

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Safety Valves (AREA)

Abstract

1466022 Valves ZAHNRADFABRIK FRIEDRICH AG 23 Jan 1975 [23 Jan 1974 8 Jan 1975 (2)] 2969/75 Heading F2V [Also in Division G3] In a pilot-operated relief valve the pilot valve has two opposed surfaces subject to inlet pressure and a further surface axially intermediate the two opposed surfaces, subject to outlet pressure. In a first embodiment, Fig. 1, the pilot valve 9 is in the form of a stepped piston with an axial passage so that inlet pressure acts on the two end faces of the piston and outlet pressure acts on a stepped face 11. In a second embodiment, Fig. 2 (not shown), the pilot valve comprises a loose ball closure member (16) seating on a main valve sliding piston (201) actuated by a plenum (14) sliding in the main piston and having an extension pin (15) of smaller diameter which lifts the ball off its seat. The end of the piston (14) opposite the ball is subject to inlet pressure via a deformable plastics seal (20) fixed in the bore (19) in which the piston (14) slides, the surface intermediate the piston and its extension pin is subject to outlet pressure and the ball is subject to outlet pressure on its surface within the seat orifice and the remaining surface of the ball is subject to inlet pressure via a passage (210) through the main valve piston (201). In a third embodiment, Fig. 3 (not shown) and similar to Fig. 2, the pilot valve (24) is a conical lift valve and a filter (22), surrounding the bore in which the plunger slides, filters not only the fluid applied to the plastics seal but also filters the supply of inlet pressure to the pilot lift valve via a bore (310) in the main valve piston. In fourth and fifth embodiments, Figs. 4 and 5 (not shown) the pilot valve member is a conical lift valve and in a sixth embodiment, Fig. 6 (not shown) having a loose-ball pilot valve a further passage (28) is provided communicating with the chamber (307) behind the main valve so that the pilot valve, and hence the main valve, may be opened by remote control of a pressure supply to the passage (28). In a seventh embodiment Fig. 7 (not shown) the pilot valve is a sliding piston valve actuated by a smaller diameter plunger, inlet pressure being applied to the opposed ends of the plunger and piston and outlet pressure being applied to the differential area where these two members are in contact. In an eighth embodiment, Fig. 8 (not shown) the pilot valve, similar in construction to that of Fig. 4, is fixed in the end of the chamber, in which the main valve moves, remote from the inlet. In a sixth embodiment, Fig. 9, the pilot valve comprises a hollow tubular moving closure member 928 which seats on a ball 929 in non-closing contact with a tubular part 930 in communication with outlet pressure. The closure member 928 slides on the tube 930 by means of a ring 933, a seal 934 being provided between the tube and closure member. The closure member moves under the combined influence of a spring 906 and inlet and outlet pressures operating on the various surfaces of the member and the ring 933 and seal 934 as influenced by the pressure of the ball seat 929. In a tenth embodiment, Fig. 10 (not shown) and generally similar to Fig. 9, the main relief valve is a lift-type whereas all the others are sliding piston-type.
GB296975A 1974-01-23 1975-01-23 Pilot-controlled pressure relief valves Expired GB1466022A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19742403007 DE2403007C2 (en) 1974-01-23 1974-01-23 Pilot operated pressure relief valve
DE2500537A DE2500537C2 (en) 1975-01-08 1975-01-08 Pilot operated pressure relief valve
DE2500480A DE2500480C2 (en) 1975-01-08 1975-01-08 Pilot operated pressure relief valve

Publications (1)

Publication Number Publication Date
GB1466022A true GB1466022A (en) 1977-03-02

Family

ID=27185737

Family Applications (1)

Application Number Title Priority Date Filing Date
GB296975A Expired GB1466022A (en) 1974-01-23 1975-01-23 Pilot-controlled pressure relief valves

Country Status (10)

Country Link
JP (1) JPS5920911B2 (en)
BG (1) BG29576A3 (en)
DK (1) DK155548C (en)
ES (1) ES434051A1 (en)
FR (1) FR2258579B1 (en)
GB (1) GB1466022A (en)
IT (1) IT1026433B (en)
PL (1) PL108692B1 (en)
RO (1) RO64385A (en)
SE (1) SE406800B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1422456A1 (en) * 2002-11-19 2004-05-26 HydraForce, Inc. Self-cleaning filter
CN108488395A (en) * 2018-05-30 2018-09-04 中国重型机械研究院股份公司 A kind of step's flux type injection valve of multistage pressure control

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0750612Y2 (en) * 1989-03-16 1995-11-15 株式会社小松製作所 Pressure control valve

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1422456A1 (en) * 2002-11-19 2004-05-26 HydraForce, Inc. Self-cleaning filter
US7137406B2 (en) 2002-11-19 2006-11-21 Hydraforce, Inc. Self-cleaning filter
CN108488395A (en) * 2018-05-30 2018-09-04 中国重型机械研究院股份公司 A kind of step's flux type injection valve of multistage pressure control
CN108488395B (en) * 2018-05-30 2024-04-02 中国重型机械研究院股份公司 Stepped flow type injection valve controlled by multistage pressure

Also Published As

Publication number Publication date
SE406800B (en) 1979-02-26
JPS50124221A (en) 1975-09-30
IT1026433B (en) 1978-09-20
DK18175A (en) 1975-10-27
FR2258579A1 (en) 1975-08-18
ES434051A1 (en) 1977-02-16
RO64385A (en) 1979-07-15
DK155548C (en) 1989-09-11
SE7500585L (en) 1975-08-20
JPS5920911B2 (en) 1984-05-16
DK155548B (en) 1989-04-17
BG29576A3 (en) 1980-12-12
FR2258579B1 (en) 1982-02-19
PL108692B1 (en) 1980-04-30

Similar Documents

Publication Publication Date Title
US4699351A (en) Pressure responsive, pilot actuated, modulating valve
US5868059A (en) Electrohydraulic valve arrangement
US4679765A (en) Low leakage orifice-controlled poppet valve
GB1237487A (en) Check valve
GB1562798A (en) Internal combustion engine electromagnetic fuel injector
GB1275838A (en) Spring loaded non-return valve
GB1490369A (en) Valve assembly
US2665708A (en) Pressure fluid operated by-pass and relief valve
GB1051018A (en) Fluid flow control valve assembly
GB1397700A (en) Fuel injection system
EP0607451A4 (en) Flow rate control valve and its control method.
US3933167A (en) Pilot operated check valve
US3227179A (en) Cartridge valves
GB1505814A (en) Poppet valve assembly
GB1466022A (en) Pilot-controlled pressure relief valves
US3351316A (en) Pilot operated piston valve
GB1182055A (en) Fluid Flow Control Device
GB1530725A (en) Fuel injection pump
US2888027A (en) Regulator
US2841173A (en) Control valve
GB1000500A (en) Hydraulic valve
US3155111A (en) Temperature compensated flow control vavle
GB1160930A (en) Improvements in or relating to hydraulic Flow Regulators
US2927766A (en) Servo valve mechanism
GB1270958A (en) A valve arrangement

Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee