Gate valve function and code and material specification

Gate Valve
It is the most commonly & very widely used valve in industrial piping for isolation of the flow. It is manually operated and it is not recommended for regulation of the flow. Installation of this  gate valve is possible from both the ends. Hence it is bi-directional valve.

Gate Valve
A) End Preparation:
(a)    Cast Steel valves have Flanged or Butt weld end preparation.
(b)   Forged Steel valves have Socket weld or Threaded end preparation.
B) Design & Dimension Standard:
The dimension Standard for gate valve is as follows.
API 600                     For Cast Steel valves (Flanged/BW valves)
API 602                     Forged Steel valves (SW/Threaded valves)
ANSI B 16.34            For Pressure & Temperature limitation & Rating
ANSI B 16.10            For face to face dimension of Flanged & BW end
API 598                     For Testing of valve
C) Main parts: Gate valve has following main parts.
  • Body
  • Bonnet
  • Internals/Trim/Wetted parts: Parts that come in direct contact with the fluid.
  • Gate valve has following Internals/Trim/Wetted parts.
  • Wedge / Seat Ring / Stem / Gland Bush
D)    Pressure Class:
There are 150,300,600,900,1500,2500 ratings for Flanged & BW valve. There is 800 rating for SW or Threaded valve.

Material:                      Forged Steel                             Cast Steel
CS                   ASTM A 105                          ASTM A 216 Gr WCB
LTCS              ASTM A 350 Gr LF2             ASTM A 352 Gr LCB
LAS                ASTM A 182 Gr F11              ASTM A 217 Gr WC6
ASTM A 182 Gr F22              ASTM A 217 Gr WC9
ASTM A 182 Gr F9
SS                    ASTM A 182 Gr F304            ASTM A 351 Gr CF8
ASTM A 182 Gr F304L         ASTM A 351 Gr CF8M
ASTM A 182 Gr F316            ASTM A 351 Gr CF3M
ASTM A 182 Gr F316L         ASTM A 351 Gr CF3C
ASTM A 182 Gr F321

  Gate Valve symbol is given below.


Share this