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

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설명

Technical Datasheet: Non-Rising Stem Gate Valve

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

General Information

Item	Standard Configuration	User Specification / Remarks
밸브 유형	Non-Rising Stem Gate Valve (Inside Screw)	Stem does not rise; ideal for limited space
본체 재질	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	스레드 (Female NPT per ASME B1.20.1)
작업	Handwheel	Malleable iron / Ductile iron handwheel
Design Standard	MSS SP-70 / MSS SP-80 (Bronze trim) / ASME B16.34 (mod)
대면	Manufacturer standard per MSS SP-70 (Threaded ends)
Inspection & Test	API 598 / MSS SP-70
압력 등급	Class 125 / Class 150 (Optional)	PN10 / PN16 available
Size Range	½” – 4″ (DN15 – DN100)
온도 범위	-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)

Design Features

Feature	설명	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

Bill of Materials (Main Components)

No.	Part Name	재료	비고
1	몸	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	줄기	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

Technical Parameters & Performance

Item	사양
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)
보어 유형	Full Bore (Standard)
Stem Design	Inside Screw, Non-Rising
Handwheel Rotation	Clockwise to Close
Installation Position	Any position

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

압력 등급	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)
150학년	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)

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.)

Special Requirements / Options

압력 등급: Class 125 / Class 150
연결 종료: NPT / BSP (Parallel or taper)
Seat Type: Integral / Renewable bronze seat rings
Wedge Material: Bronze (Standard) / Cast Iron with Bronze overlay / Stainless Steel
줄기 재질: Brass (Standard) / Stainless Steel (304/316) / Bronze
보닛 유형: 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)
부속품: 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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