NRS Metal Seated Gate Valve (HW)
NRS Metal Seated Gate Valve (HW) - Image 2

NRS Metal Seated Gate Valve (HW)

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Description

Technical Datasheet: Non-Rising Stem Gate Valve

(Cast Iron Body / Bronze Seated / Brass Stem / NPT Threaded / Handwheel)

Project Name: ____________________ Item No.: ____________________
Tag No.: ____________________ Quantity: ____________________

1. General Information

Item Standard Configuration User Specification / Remarks
Valve Type Non-Rising Stem Gate Valve (Inside Screw) Stem does not rise; ideal for limited space
Body Material Cast Iron (ASTM A126 Class B / EN-GJL-250)
Seat Material Bronze (Integral or renewable) Bronze-to-bronze sealing
Stem Material Brass (C36000 / C37700) Corrosion resistant
End Connection Threaded (Female NPT per ASME B1.20.1)
Operation Handwheel Malleable iron / Ductile iron handwheel
Design Standard MSS SP-70 / MSS SP-80 (Bronze trim) / ASME B16.34 (mod)
Face-to-Face Manufacturer standard per MSS SP-70 (Threaded ends)
Inspection & Test API 598 / MSS SP-70
Pressure Rating Class 125 / Class 150 (Optional) PN10 / PN16 available
Size Range ½” – 4″ (DN15 – DN100)
Temperature Range -20°C to +150°C (Limitation of brass stem and bronze seats)
Stem Type Non-rising stem (Inside screw)
Wedge Type Solid wedge / Double disc (Optional)

2. Design Features

Feature Description Benefit
Non-Rising Stem Stem rotates but does not move linearly; threads inside valve Suitable for tight spaces, buried service
Handwheel Operation Sturdy handwheel for manual operation Easy to operate, torque multiplication
Bronze Seated Seat rings and wedge faces are bronze Excellent corrosion resistance, long life, smooth operation
Full Port Design Straight-through full bore Low pressure drop, allows pigging
Inside Screw Stem threads are inside the valve, protected from environment Longer stem life, no external threads to corrode
Renewable Seat Rings Seat rings can be replaced (optional) Extended valve life
Cast Iron Body Robust, cost-effective Suitable for water and non-corrosive services

3. Bill of Materials (Main Components)

No. Part Name Material Remarks
1 Body Cast Iron (ASTM A126 Class B)
2 Bonnet Cast Iron (ASTM A126 Class B)
3 Wedge / Gate Bronze (ASTM B62 / B584) Solid wedge, bronze faces
4 Seat Ring (Body) Bronze (ASTM B62) Thread-in or pressed-in
5 Stem Brass (C36000 / C37700) Non-rising stem
6 Stem Nut / Thrust Washer Bronze / Brass
7 Packing Graphite / PTFE
8 Gland / Gland Follower Cast Iron / Brass
9 Bonnet Gasket Compressed Fiber / Graphite
10 Bonnet Bolts / Studs Steel (Zinc Plated) / Stainless Steel
11 Handwheel Malleable Iron / Ductile Iron
12 Handwheel Nut Steel / Brass
13 Nameplate Stainless Steel / Aluminum

4. Technical Parameters & Performance

Item Specification
Medium Water, Oil, Gas, Air, Steam, Non-corrosive Fluids
Operating Temperature -20°C to +150°C (Brass stem limit)
Max Working Pressure Class 125: 200 psi @ 100°F / 13.8 bar @ 38°C (Derate at higher temps)
Seat Material Bronze-to-Bronze
Sealing Performance API 598: Liquid – No visible leakage; Air – Class B permissible
Flow Direction Bidirectional
Flow Characteristic On-Off (Not for throttling)
Bore Type Full Bore (Standard)
Stem Design Inside Screw, Non-Rising
Handwheel Rotation Clockwise to Close
Installation Position Any position

5. Test Pressure (Reference: Per API 598 / MSS SP-70)

Pressure Rating Shell Test (Hydrostatic) Seat Test (Hydrostatic) Low Pressure Seat Test (Pneumatic)
Class 125 400 psi (2.8 MPa) 200 psi (1.4 MPa) 50-80 psi (0.34-0.55 MPa)
Class 150 425 psi (2.9 MPa) 315 psi (2.2 MPa) 50-80 psi (0.34-0.55 MPa)
*(Note: Tests performed per API 598 / MSS SP-70)*

6. Dimensions & Weight (Reference: Threaded End NPT / MSS SP-70)

NPS DN (mm) L (Face-to-Face) mm H (Closed) mm (approx) Handwheel Diameter (mm) Weight (kg) approx
½” 15 79 110 80 1.5
¾” 20 92 120 80 2.0
1″ 25 111 135 100 2.8
1¼” 32 120 150 100 3.6
1½” 40 152 170 125 5.0
2″ 50 172 195 125 7.0
2½” 65 195 225 160 11.0
3″ 80 210 255 160 15.5
4″ 100 254 300 200 23.5
(Note: Dimensions are for reference only. Refer to certified GA drawing for exact dimensions.)

7. Special Requirements / Options

  • Pressure Rating: Class 125 / Class 150

  • End Connection: NPT / BSP (Parallel or taper)

  • Seat Type: Integral / Renewable bronze seat rings

  • Wedge Material: Bronze (Standard) / Cast Iron with Bronze overlay / Stainless Steel

  • Stem Material: Brass (Standard) / Stainless Steel (304/316) / Bronze

  • Bonnet Type: Screwed-in bonnet / Bolted bonnet

  • Packing Material: Graphite / PTFE / Non-asbestos

  • Handwheel: Malleable iron / Ductile iron / Cast iron

  • Test Certificate: EN 10204 Type 2.2 / 3.1

  • Special Cleaning: For potable water / Oxygen service

  • NACE Compliance: MR0175 (Requires material upgrade)

  • Accessories: Locking device / Extension stem / Position indicator / Chainwheel

Design Notes:

  • Non-Rising Stem (NRS) : The stem rotates within the valve; the gate travels along the stem threads. This design is ideal where vertical space is limited.

  • Handwheel Operation: Provides mechanical advantage for easy operation. Standard rotation is clockwise to close.

  • Bronze Trim: Provides excellent corrosion resistance and long-term reliable sealing. Bronze-on-bronze seats are standard for water and low-pressure steam services.

  • Cast Iron Body: Suitable for non-shock applications; must be protected from rapid temperature changes and water hammer.

Application Notes:

  • Suitable for: Water distribution, wastewater, irrigation, fire protection, HVAC, and general industrial services.

  • Not suitable for: High-pressure steam, severe thermal cycling, or highly corrosive fluids (consult manufacturer for material upgrades).

  • Installation: Can be installed in any position. For buried service, consider stem extension and position indicator.

Note: This datasheet is prepared for a Non-Rising Stem Gate Valve with cast iron body, bronze seats, brass stem, NPT ends, and handwheel operation per MSS SP-70 / API 598. Ensure selected materials, pressure rating, and trim are compatible with the specific service conditions.

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