RECIPROCATING PUMP AND INTAKE VALVE MEANS THEREFOR

• US 3,806,285 A
• Filed: 04/07/1972
• Issued: 04/23/1974
• Est. Priority Date: 04/07/1972
• Status: Expired due to Term

• Current Assignee: Charles E. Sech
• Original Assignee: Charles E. Sech
• Inventors: Sech, Charles E.
• Primary Examiner(s): Freeh, William L.
• Assistant Examiner(s): Smith, Leonard
• Application Number:
  US05/241,901
• Time in Patent Office: 746 Days
• Field of Search: 417/454,566,568,506 92/168 137/454.4,541 251/363,364,365
• US Class Current: 417/568
• CPC Class Codes: F04B 53/1002 Ball valves
• CPC Class Codes: F04B 53/102 Disc valves
• CPC Class Codes: F04B 53/1087 Valve seats
• CPC Class Codes: Y10T 137/7559 Pump type
• CPC Class Codes: Y10T 137/7931 Spring in inlet

Abstract

An improved reciprocating pump is provided having an intake valve mechanism particularly useful in pumps intended for controlled or metered feed of liquid, wherein a valve assemblage incorporating a two part spring actuated movable valve member is detachably supported in a pump head in close proximity to the terminal end of a pump or piston chamber to thereby minimize the volume of communicating passages between said intake valve and pump chamber. By means of the two part construction of the movable valve member, the movable member can be mounted in the valve assemblage with the spring tensioning means remote from the valve head and connecting passages.

Claims

1. A pump mechanism comprising a housing forming an elongated closed end chamber having a piston closely engaging the side walls of said chamber and reciprocating toward and from said closed end, said housing having circumferentially spaced recesses extending radially of said chamber in alignment with the closed end thereof for detachably receiving inlet and outlet valve assemblages, said recesses communicating with said chamber through short radial passages having aligned sides coextensive with the closed end of said chamber, each of said valve assemblages including spring tensioned valve means having seating means closely adjacent the respective inlet and outlet passages, the spring tensioning means for both the inlet and outlet valves being disposed within the respective valve assemblage with the seating means between the tensioning means and the respective passages, orientation of the valve tensioning means in the intake valve assemblage being provided by a valve insert having a generally cylindrical bore extending therethrough with an annular restriction of reduced diameter adjacent the inner end of said bore providing the fluid passage of said intake valve, and an elongated valve member freely and axially movable in said bore, said movable member having an enlarged diameter valve head portion at the inner end thereof cooperating with the inner surface of said restriction to provide a valve seat, the opposite end of said member having radially extending means for tensionally engaging a coil spring arranged circumferentially of said member and in bearing engagement with the outer surface of the restriction in said bore, the bore of said intake valve insert receiving an annular resilient member in engagement with the inner surface of said restriction and providing a valve seat for engagement with the valve head portion of said axially movable member, and the bore of said intake valve insert having an annular recess of enlarged diameter adjacent the inner surface of said restriction providing interlocked engagement between said annular resilient member and said intake valve insert.

2. A pump mechanism comprising a housing forming an elongated closed end chamber having a piston closely engaging the side walls of said chamber and reciprocating toward and from said closed end, said housing having circumferentially spaced recesses extending radially of said chamber in alignment with the closed end thereof for detachably receiving inlet and outlet valve assemblages, said recesses communicating with said chamber through short radial passages having aligned sides coextensive with the closed end of said chamber, each of said valve assemblages including spring tensioned valve means having seating means closely adjacent the respective inlet and outlet passages, the spring tensioning means for both the inlet and outlet valves being disposed within the respective valve assemblage with the seating means between the tensioning means and the respective passages, orientation of the valve tensioning means in the intake valve assemblage being provided by a valve insert having a generally cylindrical bore extending therethrough with an annular restriction of reduced diameter adjacent the inner end of said bore providing the fluid passage of said intake valve, and an elongated valve member freely and axially movable in said bore, at the inner end thereof cooperating with the inner surface of said restriction to provide a valve seat, the opposite enD of said member having radially extending means for tensionally engaging a coil spring arranged circumferentially of said member and in bearing engagement with the outer surface of the restriction in said bore, said valve member comprising an internally threaded tubular inner part having an elongated shank loosely fitting within and passing through the restriction of said bore and terminating in said valve head portion at the inner end thereof, and an elongated externally threaded outer part axially interfitting with said inner part.

3. A pump mechanism as defined in claim 1, wherein the inward movement of said valve member is limited by contact with the inner end wall of the recess receiving said intake valve assemblage, and axially protruding means at the inner end of said valve head portion and within the transverse boundaries thereof maintaining transverse fluid passages between said valve head portion and the engaged inner end wall of said recess.

4. A pump mechanism as defined in claim 3, wherein the connecting passage registering with said intake valve recess is radially offset with respect to the axis of said valve member and protruding means, and the threaded portion of said outer part of the valve member extends beyond the inner part to contact the end wall of said recess.

5. A pump mechanism as defined in claim 3, wherein the connecting passage registering with said intake valve recess is in alignment with the axis of said valve member and registers with radial grooves in the end of said valve head forming circumferentially spaced projecting means.

6. An intake valve assemblage comprising a generally tubular body part having axially spaced external and circumferential flange and groove means facilitating detachable engagement with a recessed pump housing, said circumferential groove means being inwardly of said flange means providing adjacent the inner end of said body an annular recess for receiving a resilient ring-like seal member, said body having an axial bore extending therethrough having a uniform diameter throughout the major portion thereof but including a restricted portion of reduced diameter at the inner portion thereof in general alignment with said external annular recess, and a portion of enlarged diameter inwardly of said reduced diameter portion for reception of a ring-like resilient valve seat, a two part valve member arranged within said bore, the inner part of said valve member comprising an essentially tubular and internally threaded member having an enlarged inner valve head end circumferentially contoured to interfit with said valve seat, and an outwardly extending shank of a length sufficient to extend through the restricted portion of said bore and of a diameter to provide free fluid passage between said shank and the restricted portion of said bore, the outer part of said valve member comprising an elongated cylindrical body having substantially the diameter of the shank of said inner part and including a reduced axial extension externally threaded to interfit with said first part, an elongated coil spring co-axially arranged in the space between the bore of said valve body and the inner part of said valve member with the inner end thereof bearing against the outer end of the restricted portion of said bore, and radially protruding means at the outer end portion of the outer part of said valve member engaging the outer end of said spring to maintain the same under compression, thereby supporting the valve head in yieldable engagement with said valve seat.

7. An intake valve assemblage as defined in claim 6, wherein said radially protruding means comprises a split ring detachably interfitting with an annular groove at the outer end portion of said valve member.

8. An intake valve assemblage as defined in claim 9, wherein the enlarged diameter portion of the bore of said valve body terminates short of the inner end of said body providing positive positioning of said ring-like resilient valve seat.

9. An iNtake valve assemblage as defined in claim 6, wherein the inner valve head end of said valve member includes axially protruding bearing means within the transverse boundaries of said valve head providing stop engagement against the end wall of a valve recess while providing radial fluid passage between said valve head and end wall.

10. An intake valve assemblage as defined in claim 9, wherein said bearing means comprises an extension of the outer valve part protruding beyond the inner end of said inner valve part for contact with an end wall having a fluid port radially offset with respect to the axis of said valve member.

11. An intake valve assemblage as defined in claim 9, wherein said bearing means comprises a plurality of communicating radial grooves forming circumferentially spaced projections at the end of said valve member for bearing engagement with an end wall having a fluid port in alignment with the axis of said valve member.