GB2069101A - Valve device for a piston pump - Google Patents

Valve device for a piston pump Download PDF

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Publication number
GB2069101A
GB2069101A GB8024207A GB8024207A GB2069101A GB 2069101 A GB2069101 A GB 2069101A GB 8024207 A GB8024207 A GB 8024207A GB 8024207 A GB8024207 A GB 8024207A GB 2069101 A GB2069101 A GB 2069101A
Authority
GB
United Kingdom
Prior art keywords
valve
valve body
seat
valve seat
piston
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Withdrawn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
GB8024207A
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.)
Maruyama Manufacturing Co Ltd
Maruyama Seisakusho KK
Original Assignee
Maruyama Manufacturing Co Ltd
Maruyama Seisakusho KK
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 Maruyama Manufacturing Co Ltd, Maruyama Seisakusho KK filed Critical Maruyama Manufacturing Co Ltd
Publication of GB2069101A publication Critical patent/GB2069101A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/12—Valves; Arrangement of valves arranged in or on pistons
    • F04B53/122—Valves; Arrangement of valves arranged in or on pistons the piston being free-floating, e.g. the valve being formed between the actuating rod and the piston
    • 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
    • F16K15/14—Check valves with flexible valve members
    • F16K15/141—Check valves with flexible valve members the closure elements not being fixed to the valve body

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Check Valves (AREA)
  • Safety Valves (AREA)
  • Lift Valve (AREA)

Abstract

A valve device including a valve seat 7 and a valve body 9 co- operating therewith, the valve body 9 having a part-spherical seat surface (14, Figs. 2 and 3, not shown) and the valve seat having a concave or frustoconical seat surface (15, 16) so that a liquid can flow smoothly along the respective surfaces of the valve body and the valve seat, with energy generated by the valve body contacting the valve seat being decreased, thereby reducing noise. If the valve body is incorrectly seated on the valve seat, the valve body can be automatically returned to its correct position by virtue of the action of the surfaces of both members. <IMAGE>

Description

SPECIFICATION Valve device for a piston pump This invention relates to improvements in a valve device for a piston pump.
In a piston pump of the type having a valve portion provided in a suction portion and/or a discharge portion of the pump, a valve body of the valve portion is, in general, of flat disc shape, and hence a corresponding mating valve seat for the valve body has a flat seat surface.
With such a valve mechanism, fluid impinges, in use, on the valve body to flow substantially at a right angle thereto, and a large amount of energy is produced when the valve body contacts the valve seat, thereby generating noise. Where the valve body is intended to be pressed by a spring onto the valve seat, it is possible, in extreme cases, for mis-alignment to occur so that the valve body does not properly re-seat on the valve seat.
In such a case the valve body would fail to fulfil its intended function of preventing flow.
It is accordingly an object of the present invention to provide an improved valve device, in which the above mentioned disadvantages are overcome or at least minimised.
According to the invention a valve device comprises a valve portion including a valve body and a valve seat, characterised in that the valve seat has a concave or frusto-conical seat surface, and the valve body which cooperates with said valve seat has a part-spherical seat surface.
With the valve device of the invention liquid can flow smoothly along the respective surfaces of the valve body and valve seat. Energy generated when the valve body contacts the valve seat is reduced, thus decreasing any noise, and the valve body can be automatically and easily returned to its correct seated position.
The invention will now be described, by way of example, with reference to the accompanying drawings, in which: Figure 1 is a longitudinal cross-sectional view of a piston pump incorporating a valve device according to a first embodiment of the present invention; Figure 2 is an enlarged fragmentary cross sectionai view showing a valve seat and a valve body of the valve device of Figure 1; and Figure 3 is an enlarged fragmentary crosssectional view showing a valve seat and a valve body of another embodiment of the present invention.
Figure 1 shows a piston pump 1 in which a piston 4 is slidably fitted into a cylinder portion 2 of the piston pump 1 in a manner to reciprocate by means of a piston rod 3. A flange 5 is rigidly secured to the piston rod 3 at the rear of the piston 4 (on the left side in Figure 1). A boxshaped valve portion 6, provided with a discharge port 10, is attached to a front end of the cylinder portion 2. A valve seat 7 and a valve body 9, adapted to be pressed against the valve seat 7 by a spring 8, are provided in the valve portion 6. A sealing member 11 is disposed in a rear portion of the cylinder portion 2, thereby to define a chamber 13 having an intake port 12 therein.
According to this embodiment of the present invention, the valve body 9 has a part-spherical seat surface 14 (see Figure 2) and hence the valve seat 7 co-operating with the valve body has a concave seat surface 1 5 conforming to the partspherical surface of the valve body, so that when the valve body 9 is forced in a direction away from the valve seat 7 against the force of the spring 8, on the compression stroke (on the rightward stroke in Figure 1) of the piston 4 by the operation of the pump, then the liquid is caused to flow smoothly along the spherical surface of the valve body 9 in the valve portion 6 to discharge through the discharge port 10. Furthermore, energy generated when the valve body 9 contacts the valve seat 7 is greatly decreased, thus reducing noise.In the event that the valve body is seated somewhat in a wrong posture on the valve seat 7, for example, in a tilted fashion with respect to the valve seat 7, the wrong posture of the valve body can be immediateiy corrected by virtue of the action of the part-spherical mating surfaces 14 and 1 5 of the two valve members.
Figure 3 shows another embodiment of the present invention. In this embodiment, the seat surface 14 of the valve body 9 is of a partspherical shape as in the first embodiment, but a seat surface 16 of the valve seat 7' co-operating with the valve body 9 is of frusto-conical form.
This embodiment produces the same effects as in the first embodiment.
In the foregoing, the valve device of the present invention has been described as being incorporated in a valve portion which is disposed in the discharge portion of the pump. However it will be apparent that the valve device of the present invention could equally well be applied to a valve portion disposed in the suction side of the pump.
Since, in the present invention, the valve body has a part-spherical seat surface and the valve seat co-operating with the valve body has a concave or frusto-conical seat surface, liquid, for example, is caused to flow smoothly along the part-spherical or frusto-conical surfaces, with energy generated when the valve body comes into contact with the valve seat being decreased, thus reducing noise. Furthermore, the valve body can be automatically and easily returned by the spring to its correct closed position with the aid of the described surfaces of the valve body and the valve seat.
Reference is hereby directed to our co-pending U.K. Patent Application No. 8024206.
1. A valve device for a piston pump, comprising a valve portion including a valve body and a valve seat, characterized in that the valve seat has a concave or frusto-conical seat surface and the
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (2)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Valve device for a piston pump This invention relates to improvements in a valve device for a piston pump. In a piston pump of the type having a valve portion provided in a suction portion and/or a discharge portion of the pump, a valve body of the valve portion is, in general, of flat disc shape, and hence a corresponding mating valve seat for the valve body has a flat seat surface. With such a valve mechanism, fluid impinges, in use, on the valve body to flow substantially at a right angle thereto, and a large amount of energy is produced when the valve body contacts the valve seat, thereby generating noise. Where the valve body is intended to be pressed by a spring onto the valve seat, it is possible, in extreme cases, for mis-alignment to occur so that the valve body does not properly re-seat on the valve seat. In such a case the valve body would fail to fulfil its intended function of preventing flow. It is accordingly an object of the present invention to provide an improved valve device, in which the above mentioned disadvantages are overcome or at least minimised. According to the invention a valve device comprises a valve portion including a valve body and a valve seat, characterised in that the valve seat has a concave or frusto-conical seat surface, and the valve body which cooperates with said valve seat has a part-spherical seat surface. With the valve device of the invention liquid can flow smoothly along the respective surfaces of the valve body and valve seat. Energy generated when the valve body contacts the valve seat is reduced, thus decreasing any noise, and the valve body can be automatically and easily returned to its correct seated position. The invention will now be described, by way of example, with reference to the accompanying drawings, in which: Figure 1 is a longitudinal cross-sectional view of a piston pump incorporating a valve device according to a first embodiment of the present invention; Figure 2 is an enlarged fragmentary cross sectionai view showing a valve seat and a valve body of the valve device of Figure 1; and Figure 3 is an enlarged fragmentary crosssectional view showing a valve seat and a valve body of another embodiment of the present invention. Figure 1 shows a piston pump 1 in which a piston 4 is slidably fitted into a cylinder portion 2 of the piston pump 1 in a manner to reciprocate by means of a piston rod 3. A flange 5 is rigidly secured to the piston rod 3 at the rear of the piston 4 (on the left side in Figure 1). A boxshaped valve portion 6, provided with a discharge port 10, is attached to a front end of the cylinder portion 2. A valve seat 7 and a valve body 9, adapted to be pressed against the valve seat 7 by a spring 8, are provided in the valve portion 6. A sealing member 11 is disposed in a rear portion of the cylinder portion 2, thereby to define a chamber 13 having an intake port 12 therein. According to this embodiment of the present invention, the valve body 9 has a part-spherical seat surface 14 (see Figure 2) and hence the valve seat 7 co-operating with the valve body has a concave seat surface 1 5 conforming to the partspherical surface of the valve body, so that when the valve body 9 is forced in a direction away from the valve seat 7 against the force of the spring 8, on the compression stroke (on the rightward stroke in Figure 1) of the piston 4 by the operation of the pump, then the liquid is caused to flow smoothly along the spherical surface of the valve body 9 in the valve portion 6 to discharge through the discharge port 10. Furthermore, energy generated when the valve body 9 contacts the valve seat 7 is greatly decreased, thus reducing noise.In the event that the valve body is seated somewhat in a wrong posture on the valve seat 7, for example, in a tilted fashion with respect to the valve seat 7, the wrong posture of the valve body can be immediateiy corrected by virtue of the action of the part-spherical mating surfaces 14 and 1 5 of the two valve members. Figure 3 shows another embodiment of the present invention. In this embodiment, the seat surface 14 of the valve body 9 is of a partspherical shape as in the first embodiment, but a seat surface 16 of the valve seat 7' co-operating with the valve body 9 is of frusto-conical form. This embodiment produces the same effects as in the first embodiment. In the foregoing, the valve device of the present invention has been described as being incorporated in a valve portion which is disposed in the discharge portion of the pump. However it will be apparent that the valve device of the present invention could equally well be applied to a valve portion disposed in the suction side of the pump. Since, in the present invention, the valve body has a part-spherical seat surface and the valve seat co-operating with the valve body has a concave or frusto-conical seat surface, liquid, for example, is caused to flow smoothly along the part-spherical or frusto-conical surfaces, with energy generated when the valve body comes into contact with the valve seat being decreased, thus reducing noise. Furthermore, the valve body can be automatically and easily returned by the spring to its correct closed position with the aid of the described surfaces of the valve body and the valve seat. Reference is hereby directed to our co-pending U.K. Patent Application No. 8024206. CLAIMS
1. A valve device for a piston pump, comprising a valve portion including a valve body and a valve seat, characterized in that the valve seat has a concave or frusto-conical seat surface and the valve body which co-operates with said valve seat has a part-spherical seat surface.
2. A valve device for a piston pump substantially as hereinbefore described with reference to, and as shown in Figures 1 and 2 or Figure 3 of the accompanying drawings.
GB8024207A 1979-12-25 1980-07-24 Valve device for a piston pump Withdrawn GB2069101A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17861479U JPS5695652U (en) 1979-12-25 1979-12-25

Publications (1)

Publication Number Publication Date
GB2069101A true GB2069101A (en) 1981-08-19

Family

ID=16051517

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8024207A Withdrawn GB2069101A (en) 1979-12-25 1980-07-24 Valve device for a piston pump

Country Status (5)

Country Link
JP (1) JPS5695652U (en)
DE (1) DE3025699A1 (en)
DK (1) DK315680A (en)
FR (1) FR2472679A1 (en)
GB (1) GB2069101A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4944637A (en) * 1987-01-30 1990-07-31 Fletcher Gilbert K Valved seed outlet
US5584676A (en) * 1994-10-27 1996-12-17 Tecumseh Products Company Compressor discharge valve having a guided spherical head
EP1291529A2 (en) * 2001-09-05 2003-03-12 Copeland Corporation Compressor discharge valve

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0723592Y2 (en) * 1987-02-13 1995-05-31 株式会社丸山製作所 Structure of reciprocating pump
DE19963480B4 (en) * 1999-12-28 2012-02-02 Continental Teves Ag & Co. Ohg Regulated brake system with an eccentric driven piston pump
CN103104482B (en) * 2013-01-28 2015-07-29 浙江瑞丰五福气动工具有限公司 A kind of pump rod structure for plunger pump

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1317742A (en) * 1963-05-08
FR619837A (en) * 1926-08-05 1927-04-09 Berzelius Metallhu Tten Gmbh Pump valve
US2137402A (en) * 1936-12-21 1938-11-22 Hofco Pump Ltd Pump valve construction
US2603452A (en) * 1949-04-04 1952-07-15 John Kirk Pump valve
DE843484C (en) * 1950-04-01 1952-07-10 Meer Ag Maschf Nozzle check valve
FR1360667A (en) * 1963-06-18 1964-05-08 C H Johnson Machinery Ltd Diaphragm type pump
JPS4314899Y1 (en) * 1964-06-02 1968-06-22
FR2390582A1 (en) * 1977-05-13 1978-12-08 Cytec France Direct acting heat engine - has flexible membrane coupled to resonant spring mass system to maintain reciprocating action

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4944637A (en) * 1987-01-30 1990-07-31 Fletcher Gilbert K Valved seed outlet
US5584676A (en) * 1994-10-27 1996-12-17 Tecumseh Products Company Compressor discharge valve having a guided spherical head
EP1291529A2 (en) * 2001-09-05 2003-03-12 Copeland Corporation Compressor discharge valve
EP1291529A3 (en) * 2001-09-05 2003-07-16 Copeland Corporation Compressor discharge valve
AU2002300780B2 (en) * 2001-09-05 2006-02-23 Emerson Climate Technologies, Inc. Compressor discharge valve
AU2002300780B9 (en) * 2001-09-05 2006-04-13 Emerson Climate Technologies, Inc. Compressor discharge valve
CN100419270C (en) * 2001-09-05 2008-09-17 爱默生气候技术公司 Exhaust valve of compressor

Also Published As

Publication number Publication date
DK315680A (en) 1981-06-26
DE3025699A1 (en) 1981-07-02
JPS5695652U (en) 1981-07-29
FR2472679A1 (en) 1981-07-03

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Legal Events

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