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GB2116293A - Combined check valve and restrictor - Google Patents

Combined check valve and restrictor Download PDF

Info

Publication number
GB2116293A
GB2116293A GB08206676A GB8206676A GB2116293A GB 2116293 A GB2116293 A GB 2116293A GB 08206676 A GB08206676 A GB 08206676A GB 8206676 A GB8206676 A GB 8206676A GB 2116293 A GB2116293 A GB 2116293A
Authority
GB
United Kingdom
Prior art keywords
valve
restrictor
check valve
seat
closure member
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.)
Withdrawn
Application number
GB08206676A
Inventor
Stephen Paul Cook
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.)
Dowty Mining Equipment Ltd
Original Assignee
Dowty Mining Equipment Ltd
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
Application filed by Dowty Mining Equipment Ltd filed Critical Dowty Mining Equipment Ltd
Priority to GB08206676A priority Critical patent/GB2116293A/en
Publication of GB2116293A publication Critical patent/GB2116293A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K47/00—Means in valves for absorbing fluid energy
    • F16K47/08—Means in valves for absorbing fluid energy for decreasing pressure or noise level and having a throttling member separate from the closure member, e.g. screens, slots, labyrinths
    • F16K47/16—Means in valves for absorbing fluid energy for decreasing pressure or noise level and having a throttling member separate from the closure member, e.g. screens, slots, labyrinths the throttling member being a cone
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F16K1/34—Cutting-off parts, e.g. valve members, seats
    • F16K1/36—Valve members
    • F16K1/38—Valve members of conical shape
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K15/00—Check valves
    • F16K15/02—Check valves with guided rigid valve members
    • F16K15/021—Check valves with guided rigid valve members the valve member being a movable body around which the medium flows when the valve is open

Landscapes

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

Abstract

The combination has a valve body (1), valve seat (2), a movable valve-closure member (3) engageable with the seat and a small gap, e.g. formed by a flat (4) between the closure member and the seat, to afford restricted flow of the liquid through the valve, when the closure member is engaged on the seat. <IMAGE>

Description

SPECIFICATION Hydraulic valves Some hydraulic circuits require to have a check valve in parallel with a restrictor. The purpose of the restrictor is to permit a controlled flow, at a slow rate, of liquid from the circuit, during which time the check valve is closed. The purpose of the check valve is to permit rapid flow of liquid, from a suitable source, to make up in the circuit, when required, the liquid which has been previously lost from the circuit by leakage of liquid through the restrictor.
Even when a filter is used to filter liquid flowing into the circuit through the check valve, dirt can get into the circuit and this dirt can cause the restrictor, as liquid leaks through it, to slit up. This affects the performance of the restrictor and it has not, hitherto, been easy to remove the dirt from the restrictor.
It is an object of the invention to provide an improved check valve and restrictor which are in parallel.
According to this invention a combined check valve and restrictor has a valve body, a valve seat, a movable valve-closure member engageable with the seat and a small gap between the closure member and the seat, to afford restricted flow of liquid through the valve, when the closure member is engaged on the seat.
The small gap may be formed entirely by modification of the surface of the valve-closure member, or entirely by modification of the valve body and the valve seat or by modification of all three. For example, a flat may be formed on part of the surface of the valve-closure member so that there is a gap between it and the valve seat.
When the combined check valve and restrictor is included in a hydraulic circuit and the check valve is closed, controlled leakage from one side of the check valve to the other by way of the restrictor can occur. When the check valve is open, liquid will flow over the valve-closure member and flush away from the flat any dirt which may be tending to silt up the restrictor.
Thus, the restrictor will be cleaned each time the check valve is opened to make up liquid lost from a hydraulic circuit associated with the combined check valve and restrictor.
A combined check valve and restrictor in accordance with an embodiment of the invention is illustrated in the accompanying drawings of which Figure 1 is a sectional view of part of the combined check valve and restrictor, Figure 2 is an end view of the valve-closure member looking in the direction II shown in Figure 1, and Figure 3 is a sectional view taken along the line Ill-Ill of Figure 1.
Referring to the drawings, the combined check valve and restrictor comprises a valve body 1, a valve seat 2 formed in the body 1, and a valveclosure member 3 which will normally be urged into engagement with the valve seat 2 by a suitable spring (not shown).
Part of the surface of the valve-closure member 3 is provided with a flat 4 which, when the member 3 is urged against the valve seat 2, provides a small gap forming a restrictive orifice between the member 3 and the seat 2.
When the check valve is closed, that is to say the member 3 is urged against the valve seat 2, a controlled flow of leakage can take place from one side of the valve to the other. When the check valve is open, say to charge a circuit with which it is associated with liquid, the liquid flowing between the member 3 and the seat 2 will flush away any dirt which has previously lodged between the flat and the seat. The triangular shape of the flat (see Figure 2) will assist the flushing away of any dirt.
Claims
1. A combined check valve and restrictor having a valve body, a valve seat, a movable valve-closure member engageable with the seat and a small gap between the closure member and the seat, to afford restricted flow of liquid through the valve, when the closure member is engaged on the seat.
2. A combined check valve and restrictor as claimed in Claim 1, in which the small gap is provided by a flat formed on part of the surface of the closure member.
3. A combined check valve and restrictor substantially as hereinbefore described with reference to the accompanying drawings.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (3)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Hydraulic valves Some hydraulic circuits require to have a check valve in parallel with a restrictor. The purpose of the restrictor is to permit a controlled flow, at a slow rate, of liquid from the circuit, during which time the check valve is closed. The purpose of the check valve is to permit rapid flow of liquid, from a suitable source, to make up in the circuit, when required, the liquid which has been previously lost from the circuit by leakage of liquid through the restrictor. Even when a filter is used to filter liquid flowing into the circuit through the check valve, dirt can get into the circuit and this dirt can cause the restrictor, as liquid leaks through it, to slit up. This affects the performance of the restrictor and it has not, hitherto, been easy to remove the dirt from the restrictor. It is an object of the invention to provide an improved check valve and restrictor which are in parallel. According to this invention a combined check valve and restrictor has a valve body, a valve seat, a movable valve-closure member engageable with the seat and a small gap between the closure member and the seat, to afford restricted flow of liquid through the valve, when the closure member is engaged on the seat. The small gap may be formed entirely by modification of the surface of the valve-closure member, or entirely by modification of the valve body and the valve seat or by modification of all three. For example, a flat may be formed on part of the surface of the valve-closure member so that there is a gap between it and the valve seat. When the combined check valve and restrictor is included in a hydraulic circuit and the check valve is closed, controlled leakage from one side of the check valve to the other by way of the restrictor can occur. When the check valve is open, liquid will flow over the valve-closure member and flush away from the flat any dirt which may be tending to silt up the restrictor. Thus, the restrictor will be cleaned each time the check valve is opened to make up liquid lost from a hydraulic circuit associated with the combined check valve and restrictor. A combined check valve and restrictor in accordance with an embodiment of the invention is illustrated in the accompanying drawings of which Figure 1 is a sectional view of part of the combined check valve and restrictor, Figure 2 is an end view of the valve-closure member looking in the direction II shown in Figure 1, and Figure 3 is a sectional view taken along the line Ill-Ill of Figure 1. Referring to the drawings, the combined check valve and restrictor comprises a valve body 1, a valve seat 2 formed in the body 1, and a valveclosure member 3 which will normally be urged into engagement with the valve seat 2 by a suitable spring (not shown). Part of the surface of the valve-closure member 3 is provided with a flat 4 which, when the member 3 is urged against the valve seat 2, provides a small gap forming a restrictive orifice between the member 3 and the seat 2. When the check valve is closed, that is to say the member 3 is urged against the valve seat 2, a controlled flow of leakage can take place from one side of the valve to the other. When the check valve is open, say to charge a circuit with which it is associated with liquid, the liquid flowing between the member 3 and the seat 2 will flush away any dirt which has previously lodged between the flat and the seat. The triangular shape of the flat (see Figure 2) will assist the flushing away of any dirt. Claims
1. A combined check valve and restrictor having a valve body, a valve seat, a movable valve-closure member engageable with the seat and a small gap between the closure member and the seat, to afford restricted flow of liquid through the valve, when the closure member is engaged on the seat.
2. A combined check valve and restrictor as claimed in Claim 1, in which the small gap is provided by a flat formed on part of the surface of the closure member.
3. A combined check valve and restrictor substantially as hereinbefore described with reference to the accompanying drawings.
GB08206676A 1982-03-06 1982-03-06 Combined check valve and restrictor Withdrawn GB2116293A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08206676A GB2116293A (en) 1982-03-06 1982-03-06 Combined check valve and restrictor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08206676A GB2116293A (en) 1982-03-06 1982-03-06 Combined check valve and restrictor

Publications (1)

Publication Number Publication Date
GB2116293A true GB2116293A (en) 1983-09-21

Family

ID=10528847

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08206676A Withdrawn GB2116293A (en) 1982-03-06 1982-03-06 Combined check valve and restrictor

Country Status (1)

Country Link
GB (1) GB2116293A (en)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2143449A (en) * 1983-06-03 1985-02-13 Drester Ab Abrasive blast apparatus
GB2163532A (en) * 1984-08-24 1986-02-26 Godiva Fire Pumps Ltd Flow control valve
US4949747A (en) * 1988-10-12 1990-08-21 Peretz Rosenberg Self-flushing fluid apparatus particularly useful in pulsator devices
US4958657A (en) * 1989-05-11 1990-09-25 Umac Incorporated Gas supply safety device
GB2266757A (en) * 1992-05-07 1993-11-10 Dart Engineering Ag Check valve and valved nozzle
DE20108618U1 (en) * 2001-05-23 2002-10-24 Ing. Walter Hengst GmbH & Co. KG, 48147 Münster Valve, in particular a control or bypass valve for a fluid medium
WO2004083695A1 (en) * 2003-03-19 2004-09-30 Robert Bosch Gmbh Pressure-control valve
EP1808624A1 (en) * 2006-01-16 2007-07-18 Hong-Sung Joo Pressure valve
US7926470B2 (en) 2008-04-11 2011-04-19 Caterpillar Inc. Compact relief valve having damping functionality
RU2437019C1 (en) * 2010-07-16 2011-12-20 Российская Федерации, от имени которой выступает государственный заказчик-Государственная корпорация по атомной энергии "Росатом" Device for regulation of gas exchange of sealed vessels with environment
US8240291B2 (en) 2009-10-23 2012-08-14 Caterpillar Inc. Pressure relief valve
CN103502710A (en) * 2011-04-29 2014-01-08 罗伯特·博世有限公司 Pressure-limiting valve
CN105393033A (en) * 2013-07-23 2016-03-09 Ｋｙｂ株式会社 Control valve
CN105393032A (en) * 2013-07-23 2016-03-09 Ｋｙｂ株式会社 Control valve

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2143449A (en) * 1983-06-03 1985-02-13 Drester Ab Abrasive blast apparatus
GB2163532A (en) * 1984-08-24 1986-02-26 Godiva Fire Pumps Ltd Flow control valve
US4949747A (en) * 1988-10-12 1990-08-21 Peretz Rosenberg Self-flushing fluid apparatus particularly useful in pulsator devices
US4958657A (en) * 1989-05-11 1990-09-25 Umac Incorporated Gas supply safety device
GB2266757A (en) * 1992-05-07 1993-11-10 Dart Engineering Ag Check valve and valved nozzle
US5312083A (en) * 1992-05-07 1994-05-17 Thure Ekman Arrangement in a media-conducting unit
GB2266757B (en) * 1992-05-07 1996-01-17 Dart Engineering Ag A media-conducting unit
DE20108618U1 (en) * 2001-05-23 2002-10-24 Ing. Walter Hengst GmbH & Co. KG, 48147 Münster Valve, in particular a control or bypass valve for a fluid medium
US8047227B2 (en) 2003-03-19 2011-11-01 Robert Bosch Gmbh Pressure limiting valve
WO2004083695A1 (en) * 2003-03-19 2004-09-30 Robert Bosch Gmbh Pressure-control valve
EP1808624A1 (en) * 2006-01-16 2007-07-18 Hong-Sung Joo Pressure valve
US7926470B2 (en) 2008-04-11 2011-04-19 Caterpillar Inc. Compact relief valve having damping functionality
US8240291B2 (en) 2009-10-23 2012-08-14 Caterpillar Inc. Pressure relief valve
RU2437019C1 (en) * 2010-07-16 2011-12-20 Российская Федерации, от имени которой выступает государственный заказчик-Государственная корпорация по атомной энергии "Росатом" Device for regulation of gas exchange of sealed vessels with environment
CN103502710A (en) * 2011-04-29 2014-01-08 罗伯特·博世有限公司 Pressure-limiting valve
US9228667B2 (en) 2011-04-29 2016-01-05 Robert Bosch Gmbh Pressure-limiting valve
CN103502710B (en) * 2011-04-29 2016-02-10 罗伯特·博世有限公司 Pressure-limit valve
CN105393033A (en) * 2013-07-23 2016-03-09 Ｋｙｂ株式会社 Control valve
CN105393032A (en) * 2013-07-23 2016-03-09 Ｋｙｂ株式会社 Control valve
CN105393032B (en) * 2013-07-23 2018-02-13 Ｋｙｂ株式会社 Control valve
US9903488B2 (en) 2013-07-23 2018-02-27 Kyb Corporation Control valve

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)