M SERIES GATE VALVES
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The Valveworks USA M series consists of a lineup of gate valves with reliable, proven designs that are engineered and manufactured to meet the requirements of API 6A. This series of gate valves off ers the user several options depending on the specifi c application. Whether you need to achieve a seal at little to zero pressure, or at 5,000 PSI, there is a valve for your specifi c application in the M series.

M series gate valves are full-bore, through-conduit valves. This allows for downhole tools to be passed through the wellhead and reduces turbulent flow. M series valves are similar to each other in design with only slight variations across the lineup, off ering a high percentage of parts interchangeability, giving you an effi ciency-driven advantage in the management and maintenance of your gate valve fleet and providing optimal lifecycle management integrity.

This page provides an in-depth look at the details of this series of gate valves and explains the features, benefits, characteristics, dimensional & technical data and other valuable information needed to determine which valve provides an optimal solution for your specific application.

Table 1 - Product Features

M Series Gate Valves Product Features
  1. Equipped with a non-sealing seat on the upstream side. See engineering note titled "Model MDS" for details.
  2. 2-1/16" x 1-13/16", 3-1/8" x 3-3/16", 4-1/16" x 4-1/8", and 4-1/16" x 4-1/4" available upon request.
  3. Product Specification Level
  4. See engineering note titled "Expanding Gate Assembly Operation Explained" for details.
  5. Also referred to as "HANDWHEEL OPERATED"
  6. Also referred to as "FULL OPENING".
  7. Injectable packing can be energized into the valve bonnet stuffing box under pressure.
  8. Valve bonnet equipped with grease port and fitting for bearing lubrication.

TABLE 1 - PRODUCT FEATURES

MODEL M GATE VALVE VARIATIONS
FEATURES M MSG MDS MRC MRC SG MRC DS
Available
Bore Sizea
& Working Pressure (PSI)
2-1/16" 2K,3K,5K
2-9/16" 2K,3K,5K
3-1/8" 2K,3K
4-1/16" 2K
2-1/16" 2K,3K,5K
2-9/16" 2K,3K,5K
3-1/8" 2K,3K,5K
4-1/16" 2K,3K,5K
5-1/8" 2K,3K,5K
2-1/16" 2K,3K,5K
2-9/16" 2K,3K,5K
3-1/8" 2K,3K,5K
4-1/16" 2K,3K,5K
5-1/8" 2K,3K,5K
2-1/16" 2K,3K,5K
2-9/16" 2K,3K,5K
3-1/8" 2K,3K
4-1/16" 2K
2-1/16" 2K,3K,5K
2-9/16" 2K,3K,5K
3-1/8" 2K,3K,5K
4-1/16" 2K,3K,5K
5-1/8" 2K,3K,5K
2-1/16" 2K,3K,5K
2-9/16" 2K,3K,5K
3-1/8" 2K,3K,5K
4-1/16" 2K,3K,5K
5-1/8" 2K,3K,5K
Operation Manualb Manualb Manualb Manualb Manualb Manualb
Valve Body Cast Cast Cast Forged Forged Forged
Bore Type Thru-Conduitc Thru-Conduitc Thru-Conduitc Thru-Conduitc Thru-Conduitc Thru-Conduitc
Body/Bonnet Connection Bolted Bolted Bolted Bolted Bolted Bolted
Gate Type Expandingd Slab Expandingd Expandingd Slab Expandingd
Sealing Action Mechanical Pressure-Energized Mechanical Mechanical Pressure-Energized Mechanical
Flow Direction Bidirectional Bidirectional Unidirectionale Bidirectional Bidirectional Unidirectionale
Gate/Seat Seal Metal to Metal Metal to Metal Metal to Metal Metal to Metal Metal to Metal Metal to Metal
Stem Type Non-rising Non-rising Non-rising Non-rising Non-rising Non-rising
Stem Packing Type Chevron-V Chevron-V Chevron-V Chevron-V Chevron-V Chevron-V
Repacking Yesf Yesf Yesf Yesf Yesf Yesf
Thrust Bearing 2g 2g 2g 2g 2g 2g
Body Lubrication Fittings 2 2 2 2 2 2
End Connections Flanged (RTJ) or Threaded Flanged (RTJ) or Threaded Flanged (RTJ) or Threaded Flanged (RTJ) or Threaded Flanged (RTJ) or Threaded Flanged (RTJ) or Threaded
Material Classes AA,BB,CC,DD,EE,FF AA,BB,CC,DD,EE,FF AA,BB,CC,DD,EE,FF AA,BB,CC,DD,EE,FF,HH AA,BB,CC,DD,EE,FF,HH AA,BB,CC,DD,EE,FF,HH
Temperature Range -75F (-60C) Thru 250F (121C) -75F (-60C) Thru 250F (121C) -75F (-60C) Thru 250F (121C) -75F (-60C) Thru 250F (121C) -75F (-60C) Thru 250F (121C) -75F (-60C) Thru 250F (121C)
Available PSLh 1,2 1,2 1,2 1,2,3,3G 1,2,3,3G 1,2,3,3G
  1. Equipped with a non-sealing seat on the upstream side. See engineering note titled "Model MDS" for details.
  2. 2-1/16" x 1-13/16", 3-1/8" x 3-3/16", 4-1/16" x 4-1/8", and 4-1/16" x 4-1/4" available upon request.
  3. Product Specification Level
  4. See engineering note titled "Expanding Gate Assembly Operation Explained" for details.
  5. Also referred to as "HANDWHEEL OPERATED"
  6. Also referred to as "FULL OPENING".
  7. Injectable packing can be energized into the valve bonnet stuffing box under pressure.
  8. Valve bonnet equipped with grease port and fitting for bearing lubrication.

Engineering Notes

Expanding Gate Assembly Operation Explained - The expanding gate assembly consists of two main components: the gate (major) and the segment (minor). These components are assembled together using precision machined pins and high-quality, precision formed and treated Nickel-Chromium alloy springs. When the valve is manually operated, the gate and segment act one against the other by means of a dual expanding wedge when the valve is either fully opened or fully closed. This expansion effect of the gate assembly against the valve seats, through parallel faces of the gate assembly, provides a strong and positive seal against pulsations and vibrations created by flow conditions. This is advantageous when attempting to accomplish a positive seal in both high and low pressure conditions.

Pressure-loading Explained - Pressure-loading is an event that occurs in a valve equipped with an expanding gate when the segment (minor) has a differential pressure and frictional drag from the valve body. This differential pressure across the gate assembly and seat sealing surfaces can make the valve inoperable and result in severe damage if valve operation is attempted during this event. Due to the advancements in sealing surface manufacturing processes, gate valves equipped with an expanding gate have exhibited the tendency to pressure-load. This tendency increases with an increase in bore size and pressure.

Model MDS - is a unidirectional gate valve equipped with an expanding gate assembly and a sealing seat in the downstream seat pocket. Where the MDS differs from the traditional Model M, is that the upstream seat pocket is equipped with a non-sealing seat assembly. This allows pressure to bypass the upstream seat, equalize throughout the valve body, and only seal against the downstream seat assembly, as the original Model M was intended. All model MDS valves are marked with a flow direction arrow for accurate installation.

Pressure Testing - M series gate valves are not intended to be tested through the body lubrication fittings. These fittings are designed for lubrication purposes only. Shell tests and gate/seat tests shall be conducted from the end/outlet connection by qualified personnel only.

Table 2 - Temperature Rating

TEMPERATURE CLASSIFICATION OPERATING RANGE
K -75°F (-60°C) TO 180°F (82°C)
L -50°F (-46°C) TO 180°F (82°C)
N -50°F (-46°C) TO 140°F (60°C)
P -20°F (-29°C) TO 180°F (82°C)
S 0°F (-18°C) TO 140°F (60°C)
T 0°F (-18°C) TO 180°F (82°C)
U 0°F (-18°C) TO 250°F (121°C)
V 35°F (2°C) TO 250°F (121°C)

Table 3 - Material Requirements

OPERATING RANGE
MATERIAL CLASS BODY, BONNET END & OUTLET CONNECTIONS PRESSURE-CONTROLLING PARTS & STEMS
AA General Service Carbon or Low-Alloy Steel Carbon or Low-Alloy Steel
BB General Service Carbon or Low-Alloy Steel Stainless Steel
CC General Service Stainless Steel Stainless Steel
DD Sour Servicea Carbon or Low-Alloy Steelb Carbon or Low-Alloy Steelb
EE Sour Servicea Carbon or Low-Alloy Steelb Stainless Steelb
FF Sour Servicea Stainless Steelb Stainless Steelb
HH Sour Servicea CRAacd CRAacd
  1. As defined by ISO 15156 (all parts) (NACE MR0175; See Clause 2).
  2. In accordance with ISO 15156 (NACE MR0175; See Clause 2).
  3. CRA required on retained-fluid wetted surfaces only.
  4. CRA as defined in Clause 3; ISO 15156 (all parts) (NACE MR0175; See Clause 2) definition of CRA does not apply.

Valveworks USA Description Key

GV, 6A, MOD M, EXP GATE, 2 1/16& 5M FE DD-NL- KU- 1- 2, HWO
GATE VALVE
API SPECIFICATION
VALVEWORKS USA MODEL
GATE TYPE
BORE SIZE (NOMINAL)
RATED WORKING PRESSURE
END CONNECTION
MATERIAL CLASS
TEMPERATURE RATING/CLASSIFICATION
PSL
PR
OPERATION TYPE

Abbreviation Key

  • M = Model M
  • MSG = Model M Slab Gate
  • MDS = Model M Unidirectional
  • MRC = Model M Round Cavity
  • MRC SG = Model M Round Cavity Slab Gate
  • MRC DS = Model M Round Cavity Unidirectional
  • HWO = Handwheel Operated (manual)
  • EXP = Expanding
  • SG = Slab Gate
  • FE = Flanged End
  • RTJ = Ring Type Joint
  • PSL = Product Specification Level
  • PR = Performance Requirement
  • LP = Line Pipe
  • STC = Casing Short Thead
  • LC = Casing Long Thead
  • EU = Tubing, Ecternal Upset
  • CRA = Corrosion-resistant Alloy
  • XYL = Xylan®
  • HF = Hardfaced

Dimension Table Key

Key Description
A Face to Face
B Valve Bore Size (Nominal)
C Bore Centerline to Bottom
D Bore Centerline to Top
E Handwheel Diameter
NT Number of Turns
RJ Ring Joint
TS Thread Size
BBS Bonnet Stud Size
N Number of Studs
WT Approximate Weight
HT Handwheel Operating Torque
M Series Gate Valve Dimensions

Flanged Gate Valves

SIZE WP (PSI) A B C D E NT RJ BSS N WT
(LBS)
HT
(FT-LBS)
2 1/16 2K 11 5/8 2 1/16 5 1/4 19 1/2 10 14 R-23 5/8 8 120 32
3K 14 5/8 2 1/16 5 1/2 19 5/8 13 14 R-24 7/8 8 180 40
5K 14 5/8 2 1/16 5 1/2 19 5/8 13 14 R-24 7/8 8 180 57
2 9/16 2K 13 1/8 2 9/16 6 3/8 20 1/2 13 16 1/2 R-26 5/8 8 180 37
3K 16 5/8 2 9/16 6 5/8 20 7/8 16 16 1/2 R-27 7/8 8 220 49
5K 16 5/8 2 9/16 6 5/8 20 7/8 16 16 1/2 R-27 7/8 8 220 66
3 1/8 2K 14 1/8 3 1/8 7 5/8 22 7/8 13 20 3/4 R-31 7/8 8 220 48
3K 17 1/8 3 1/8 7 5/8 23 16 20 3/4 R-31 1 8 300 65
5K 18 5/8 3 1/8 7 5/8 23 16 20 3/4 R-35 1 8 340 90*
4 1/16 2K 17 1/8 4 1/16 9 5/8 26 1/2 16 24 3/4 R-37 1 8 360 81
3K 20 1/8 4 1/16 9 5/8 26 5/8 20 24 3/4 R-37 1 3/8 8 520 67*
5K 21 5/8 4 1/16 9 5/8 26 5/8 20 24 3/4 R-39 1 3/8 8 560 130*
5 1/8 2K 22 1/2 5 1/8 11 3/4 30 24 30 1/4 R-41 1 3/8 8 770 150*
3K 24 1/8 5 1/8 11 3/4 30 24 30 1/4 R-41 1 3/8 8 810 210*
5K 28 5/8 5 1/8 11 3/4 30 24 30 1/4 R-41 1 3/8 8 940 366*
  All dimensions are in inches.
* Based on unidirectional function.

Threaded Gate Valves

SIZE WP (PSI) A B C D E NT RJ BSS N WT (LBS) HT (FT-LBS)
2 1/16 5K 9 5/8 2 1/16 5 1/2 19 5/8 13 14 2 LP
2 3/8 EU
7/8 8 125 57
2 9/16 3K 10 1/4 2 9/16 6 5/8 20 7/8 16 16 1/2 2 1/2 LP 7/8 8 160 49
5K 10 1/4 2 9/16 6 5/8 20 7/8 16 16 1/2 2 7/8 EU 7/8 8 160 66
3 1/8 3K 11 3/8 3 1/8 7 5/8 23 16 20 3/4 3 LP 1 8 230 65
5K 11 3/8 3 1/8 7 5/8 23 16 20 3/4 3 1/2 EU 1 8 230 90*
4 1/16 3K 13 4 1/16 9 5/8 26 5/8 20 24 3/4 4 LP 1 3/8 8 420 67*
5K 13 4 1/16 9 5/8 26 5/8 20 24 3/4 4 1/2 EU
4 1/2 LC
1 3/8 8 420 130*
  All dimensions are in inches.
* Based on unidirectional function.

Model M - Bidirectional, Expanding Gate, Cast Body

Model M - Bidirectional, Expanding Gate, Cast Body
d) See engineering note titled "Expanding Gate Assembly Operation Explained" for details.
g) Injectable packing can be energized into the valve bonnet stuffing box under pressure.
h) Valve bonnet equipped with grease port and fitting for bearing lubrication.

Model MSG - Bidirectional, Slab Gate, Cast Body

Model MSG - Bidirectional, Slab Gate, Cast Body
g) Injectable packing can be energized into the valve bonnet stuffing box under pressure.
h) Valve bonnet equipped with grease port and fitting for bearing lubrication.

Model MDS - Unidirectional, Expanding Gate, Cast Body

Model MDS - Unidirectional, Expanding Gate, Cast Body
a) Equipped with a non-sealing seat on the upstream side. See engineering note titled "Model MDS (Model M Directional Seal)" for details.
d) See engineering note titled "Expanding Gate Assembly Operation Explained" for details.
g) Injectable packing can be energized into the valve bonnet stuffing box under pressure.
h) Valve bonnet equipped with grease port and fitting for bearing lubrication.

Model MRC - Bidirectional, Expanding Gate, Forged Body

Model MRC - Bidirectional, Expanding Gate, Forged Body
d) See engineering note titled "Expanding Gate Assembly Operation Explained" for details.
g) Injectable packing can be energized into the valve bonnet stuffing box under pressure.
h) Valve bonnet equipped with grease port and fitting for bearing lubrication.

Model MRC SG - Bidirectional, Slab Gate, Forged Body

Model MRC SG - Bidirectional, Slab Gate, Forged Body
g) Injectable packing can be energized into the valve bonnet stuffing box under pressure.
h) Valve bonnet equipped with grease port and fitting for bearing lubrication.

Model MRC DS - Unidirectional, Expanding Gate, Forged Body

Model MRC DS - Unidirectional, Expanding Gate, Forged Body
a) Equipped with a non-sealing seat on the upstream side. See engineering note titled "Model MDS (Model M Directional Seal)" for details.
d) See engineering note titled "Expanding Gate Assembly Operation Explained" for details.
g) Injectable packing can be energized into the valve bonnet stuffing box under pressure.
h) Valve bonnet equipped with grease port and fitting for bearing lubrication.

Last Updated: 08/01/2017

DISCLAIMER: THE ACTUAL PRODUCT MAY VARY SLIGHTLY FROM SHOWN SCHEMATIC DUE TO ENGINEERING APPROVED VARIATION.

WARNING: L7M / B7M STUDS CANNOT BE SUBSTITUED FOR L7 / B7 STUDS.