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NRS Metal Seated Gate Valve (HW)

NRS Metal Seated Gate Valve (HW)

Valve Type Non-Rising Stem Gate Valve (Inside Screw)
Body Material Cast Iron (ASTM A126 Class B / EN-GJL-250)
Seat Material Bronze (Integral or renewable)
Stem Material Brass (C36000 / C37700)
End Connection Threaded (Female NPT per ASME B1.20.1)
Operation Handwheel

Descripción

Technical Datasheet: Non-Rising Stem Gate Valve

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

  1. General Information

Item

Standard Configuration

User Specification / Remarks

Tipo de válvula

Non-Rising Stem Gate Valve (Inside Screw)

Stem does not rise; ideal for limited space

Material del cuerpo

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

Enhebrado (Female NPT per ASME B1.20.1)

 

Operación

Handwheel

Malleable iron / Ductile iron handwheel

Design Standard

MSS SP-70 / MSS SP-80 (Bronze trim) / ASME B16.34 (mod)

 

Cara a cara

Manufacturer standard per MSS SP-70 (Threaded ends)

 

Inspection & Test

API 598 / MSS SP-70

 

Clasificación de presión

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)

 
  1. Design Features

Feature

Descripción

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

  1. Bill of Materials (Main Components)

No.

Part Name

Material

Remarks

1

Cuerpo

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

Provenir

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

 
  1. Technical Parameters & Performance

Item

Especificación

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)

Tipo de orificio

Full Bore (Standard)

Stem Design

Inside Screw, Non-Rising

Handwheel Rotation

Clockwise to Close

Installation Position

Any position

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

Clasificación de presión

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)

Clase 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)*

     
  1. 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.)

         
  1. Special Requirements / Options
  • Clasificación de presión: Class 125 / Class 150
  • Conexión final: NPT / BSP (Parallel or taper)
  • Seat Type: Integral / Renewable bronze seat rings
  • Wedge Material: Bronze (Standard) / Cast Iron with Bronze overlay / Stainless Steel
  • Material del tallo: Brass (Standard) / Stainless Steel (304/316) / Bronze
  • Tipo de capó: 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)
  • Accesorios: 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.

GARANTÍA:

SAVVY VALVES se compromete a ofrecer una calidad de producto excepcional y un servicio posventa sin complicaciones. Nuestras válvulas tienen una vida útil mínima garantizada de 12 meses, durante los cuales suministraremos todos los repuestos necesarios e instrucciones detalladas de mantenimiento de forma gratuita. Durante el período de garantía, si se produce algún daño no provocado por el hombre, reemplazaremos los componentes sin coste alguno y ofreceremos soporte técnico profesional. Una vez vencida la garantía, los clientes solo deberán pagar el coste de los repuestos y seguirán beneficiándose de descuentos en los servicios de mantenimiento. Nuestro objetivo es ayudar a los clientes a reducir los costes operativos y mejorar la eficiencia de la producción mediante una calidad fiable y un soporte posventa integral. Ya sea para consultas técnicas o necesidades de mantenimiento, nuestro equipo de expertos responderá con prontitud para garantizar que su sistema de válvulas mantenga un rendimiento óptimo en todo momento.

 

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