Gate valve

• US 4,095,612 A
• Filed: 02/14/1977
• Issued: 06/20/1978
• Est. Priority Date: 02/14/1977
• Status: Expired due to Term

• Current Assignee: General Equipment Co.
• Original Assignee: General Equipment Co.
• Inventors: Hardcastle, Philip P.
• Primary Examiner(s): Weakley, Harold W.
• Application Number:
  US05/768,277
• Time in Patent Office: 491 Days
• Field of Search: 137/246.22, 251/327, 251/195, 251/193, 251/196, 251/176
• US Class Current: 137/246.22
• CPC Class Codes: F16K 3/0227 Packings
• CPC Class Codes: F16K 3/36 Features relating to lubrication
• CPC Class Codes: Y10T 137/4442 External pressure

Abstract

A gate valve includes a body with a flow passage therethrough and spaced annular seating members in the body surrounding the flow passage with seal means between the seating members and the body. A gate member is positioned between the seat members and has a surface to intersect and close off the flow passage through the body and has an opening for alignment with the flow passage through the body for flow therethrough. The annular seating members include an annular surface for abutting the gate with an annular teflon seal means in the surface and an annular groove also therein with sealant passage means for communicating with sealant passage means in the body for directing sealant to the groove means. Spaced projecting vertical guide surfaces are provided on the annular seating members for abutting the edges of the gate member to retain it aligned in the body. A stem is threadedly secured with a cylindrical member rotatably carried by the gate member whereby rotation of the stem raises and lowers the gate. The gate member includes a pair of rectangular plate members with means connecting the plate members together while accommodating limited relative movement therebetween with spring means tending to urge said plate members apart.

Claims

1. A gate valve comprising:

a. a body having a flow passage therethrough;

b. spaced annular seating members in said body;

c. seal means between said seating members and said body;

d. a gate member positioned between said seating members and having a surface to close off the flow passage through said body and an opening for alignment with the flow passage through said body, said gate member comprising;

1. a pair of rectangular plate members;

2. means connecting said plate members together but accommodating limited relative movement therebetween; and

3. spring means tending to urge said plate members apart;

e. said annular seating members each including;

2. an annular surface for abutting said gate;

2. annular teflon seal means in each surface for sealing with said gate;

3. an annular groove on each of said annular surfaces;

4. sealant passage means communicating with each of said annular grooves; and

5. projecting spaced vertical guide surfaces for abutting said gate member to retain it aligned in said body;

f. a stem rotatably supported by said body and having a threaded portion engaged with said gate whereby rotation of said stem raises and lowers said gate;

g. said body having a sealant flow passage communicating with sealant passage means in said seating members; and

h. said means connecting said plate members together comprising;

1. passage means extending through each plate member;

2. recess means in each plate member and intersecting said passage means;

3. connector means in said recess means and extending between said plate members;

4. pin means in said connector means and extending in said passage means of each plate member; and

5. said pin means being smaller in size than said passage means whereby said plate members may move relative to each other.