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 offers the user several options depending on the specific application including achieving a positive seal at wellbore/flowline pressures ranging from zero to 5,000 PSI.

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, offering a high percentage of parts interchangeability, giving you an efficiency-driven advantage in the management and maintenance of your gate valve fleet and providing optimal lifecycle management integrity.

Below is 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 suits 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 & Model MRC DS" 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 MDS MSG MRC DS MRC SG
Flow Direction Unidirectionala Bidirectional Unidirectionala Bidirectional
Available
Bore Sizeb
& Rated Working Pressure (psi)
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,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
Available PSLc 1,2 1,2 1,2,3,3G 1,2,3,3G
Material Classes 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
Valve Body Cast Cast Forged Forged
Gate Type Expandingd Slab Expandingd Slab
Sealing Action Mechanical Pressure-Energized Mechanical Pressure-Energized
Operation Type Manuale Manuale Manuale Manuale
Bore Type Thru-Conduitf Thru-Conduitf Thru-Conduitf Thru-Conduitf
Gate/Seat Seal Metal to Metal Metal to Metal Metal to Metal Metal to Metal
Stem Type Non-rising Non-rising Non-rising Non-rising
Stem Packing Type Chevron-V Chevron-V Chevron-V Chevron-V
Repacking Yesg Yesg Yesg Yesg
Thrust Bearings 2h 2h 2h 2h
Body Lubrication Fittings 2 2 2 2
Body/Bonnet Connection Bolted Bolted Bolted Bolted
End Connections Flanged (RTJ) or Threaded Flanged (RTJ) or Threaded Flanged (RTJ) or Threaded Flanged (RTJ) or Threaded
Temperature Range -75F (-60C) Thru 250F (121C) -75F (-60C) Thru 250F (121C) -75F (-60C) Thru 250F (121C) -75F (-60C) Thru 250F (121C)
  1. Equipped with a non-sealing seat on the upstream side. See engineering note titled "Model MDS & Model MRC DS" 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.

Model MDS & Model MRC DS - These models are unidirectional gate valves equipped with an expanding gate assembly and a sealing seat in the downstream seat pocket. 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.

NOTE: When bidirectional operation is required, a slab gate valve is necessary. M Series expanding gate valves (Model MDS and Model MRC DS) are not designed for bidirectional operation.

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.

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

MINIMUM MATERIAL REQUIREMENTS
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 MDS, 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

  • MSG = Model M Slab Gate
  • MDS = Model M Unidirectional
  • 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.

Threaded Gate Valves

SIZE WP (PSI) A B C D E NT TS 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.

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 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 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.

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.

*The actual product may vary slightly from shown schematic due to engineering approved variation


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.