M SERIES GATE VALVES

 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.

MODEL MDS – UNIDIRECTIONAL, EXPANDING GATE, CAST BODY

MODEL MSG – BIDIRECTIONAL, SLAB GATE, CAST 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.
f) Stuffi ng box can be repacked via injectable packing while the valve is in service up to the rated working pressure.
g) Valve bonnet equipped with grease port(s) and fi tting(s) for bearing lubrication.

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.
f) Stuffing box can be repacked via injectable packing while the valve is in service up to the rated working pressure.
g) Valve bonnet equipped with grease port(s) and fitting(s) for bearing lubrication.

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

TABLE 1 – PRODUCT FEATURES

MODEL M GATE VALVE VARIATIONS
FEATURESMDSMSGMRC DSMRC SG
Flow DirectionUnidirectionalBidirectionalUnidirectionalBidirectional
AvailableBore 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 PSLc1,21,21,2,3,3G1,2,3,3G
Material ClassesAA,BB,CC,DD,EE,FFAA,BB,CC,DD,EE,FFAA,BB,CC,DD,EE,FF,HHAA,BB,CC,DD,EE,FF,HH
Valve BodyCastCastForgedForged
Gate TypeExpanding(d)SlabExpanding(d)Slab
Sealing ActionMechanicalPressure-EnergizedMechanicalPressure-Energized
Operation TypeManual(e)Manual(e)Manual(e)Manual(e)
Bore TypeFull-BoreFull-BoreFull-BoreFull-Bore
Gate/Seat SealMetal to MetalMetal to MetalMetal to MetalMetal to Metal
Stem TypeNon-risingNon-risingNon-risingNon-rising
Stem Packing TypeChevron-VChevron-VChevron-VChevron-V
RepackingYes(f)Yes(f)Yes(f)Yes(f)
Thrust Bearings2(g)2(g)2(g)2(g)
Body Lubrication Fittings2222
Body/Bonnet ConnectionBoltedBoltedBoltedBolted
End ConnectionsFlanged (RTJ) or ThreadedFlanged (RTJ) or ThreadedFlanged (RTJ) or ThreadedFlanged (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)

a. Equipped with a non-sealing seat on the upstream side. See engineering note titled “Model MDS & Model MRC DS” for details.
b. 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.
c. Product Specification Level
d. See engineering note titled “Expanding Gate Assembly Operation Explained” for details.
e. Also referred to as “HANDWHEEL OPERATED”
f. Also referred to as “FULL OPENING”.
g. Stuffing box can be repacked via in
h. Valve bonnet equipped with grease port(s) and fitting(s) 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 CLASSIFICATIONOPERATING 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)
S0°F (-18°C) TO 140°F (60°C)
T0°F (-18°C) TO 180°F (82°C)
U0°F (-18°C) TO 250°F (121°C)
V35°F (2°C) TO 250°F (121°C)

TABLE 3 – MATERIAL REQUIREMENTS

MINIMUM MATERIAL REQUIREMENTS
MATERIAL CLASSBODY, BONNET END & OUTLET CONNECTIONSPRESSURE-CONTROLLING PARTS & STEMS
AAGeneral ServiceCarbon or Low-Alloy SteelCarbon or Low-Alloy Steel
BBGeneral ServiceCarbon or Low-Alloy SteelStainless Steel
CCGeneral ServiceStainless SteelStainless Steel
DDSour Service(a)Carbon or Low-Alloy Steel(b)Carbon or Low-Alloy Steel(b)
EESour Service(a)Carbon or Low-Alloy Steel(b)Stainless Steel(b)
FFSour Service(a)Stainless Steel(b)Stainless Steel(b)
HHSour Service(a)CRA(acd)CRA(acd)
a. As defined by ISO 15156 (all parts) (NACE MR0175; See Clause 2).
b. In accordance with ISO 15156 (NACE MR0175; See Clause 2).
c. CRA required on retained-fluid wetted surfaces only.
d. 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"5MFEDD-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

KeyDescription
AFace to Face
BValve Bore Size (Nominal)
CBore Centerline to Bottom
DBore Centerline to Top
EHandwheel Diameter
NTNumber of Turns
RJRing Joint
TSThread Size
BBSBonnet Stud Size
NNumber of Studs
WTApproximate Weight
HTHandwheel Operating Torque

FLANGED GATE VALVES

SIZEWP (PSI)ABCDENTRJBSSNWT(LBS)HT(FT-LBS)
2
1/16
2K11 5/82 1/165 1/419 1/21014R-235/8812032
3K14 5/82 1/165 1/219 5/81314R-247/8818040
5K14 5/82 1/165 1/219 5/81314R-247/8818057
2
9/16
2K13 1/82 9/166 3/820 1/21316 1/2R-265/8818037
3K16 5/82 9/166 5/820 7/81616 1/2R-277/8822049
5K16 5/82 9/166 5/820 7/81616 1/2R-277/8822066
3
1/8
2K14 1/83 1/87 5/822 7/81320 3/4R-317/8822048
3K17 1/83 1/87 5/8231620 3/4R-311830065
5K18 5/83 1/87 5/8231620 3/4R-351834090
4
1/16
2K17 1/84 1/169 5/826 1/21624 3/4R-371836081
3K20 1/84 1/169 5/826 5/82024 3/4R-371 3/8852067
5K21 5/84 1/169 5/826 5/82024 3/4R-391 3/88560130
5
1/8
2K22 1/25 1/811 3/4302430 1/4R-411 3/88770150
3K24 1/85 1/811 3/4302430 1/4R-411 3/88810210
5K28 5/85 1/811 3/4302430 1/4R-411 3/88940366

All dimensions are in inches.

THREADED GATE VALVES

SIZEWP (PSI)ABCDENTTSBSSNWT (LBS)HT (FT-LBS)
2 1/165K9 5/82 1/165 1/219 5/813142 LP2 3/8 EU7/8812557
2 9/163K10 1/42 9/166 5/820 7/81616 1/22 1/2 LP7/8816049
5K10 1/42 9/166 5/820 7/81616 1/22 7/8 EU7/8816066
3 1/83K11 3/83 1/87 5/8231620 3/43 LP1823065
5K11 3/83 1/87 5/8231620 3/43 1/2 EU1823090
4 1/163K134 1/169 5/826 5/82024 3/44 LP1 3/8842067
5K134 1/169 5/826 5/82024 3/44 1/2 EU4 1/2 LC1 3/88420130

All dimensions are in inches.