NRS Metal Seated Gate Valve(Key)

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 Square Head (For wrench operation)
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)

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Technical Datasheet: Non-Rising Stem Gate Valve

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

General Information

Item	Standard Configuration	User Specification / Remarks
Typ ventilu	Non-Rising Stem Gate Valve (Inside Screw)	Stem does not rise; ideal for limited space
Materiál těla	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	Závitové (Female NPT per ASME B1.20.1)
Operace	Square Head (For wrench operation)	No handwheel
Design Standard	MSS SP-70 / MSS SP-80 (Bronze trim) / ASME B16.34 (mod)
Osobní setkání	Manufacturer standard per MSS SP-70 (Threaded ends)
Inspection & Test	API 598 / MSS SP-70
Jmenovitý tlak	Class 125 / Class 150 (Optional)	PN10 / PN16 available
Size Range	½” – 4″ (DN15 – DN100)
Teplotní rozsah	-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	Popis	Benefit
Non-Rising Stem	Stem rotates but does not move linearly; threads inside valve	Suitable for tight spaces, buried service, and indicator not needed
Square Head Operation	Machined square on top of stem for wrench operation	Simple, robust, no handwheel to break
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	Materiál	Poznámky
1	Tělo	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	Zastavit	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	Square Head / Operating Nut	Cast Iron / Malleable Iron	Square drive
12	Nameplate	Stainless Steel / Aluminum

Technical Parameters & Performance

Item	Specifikace
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)
Typ otvoru	Full Bore (Standard)
Stem Design	Inside Screw, Non-Rising
Installation Position	Any position (but horizontal preferred for square head access)

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

Jmenovitý tlak	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)
Třída 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)

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

NPS	DN (mm)	L (Face-to-Face) mm	H (Closed) mm (approx)	Square Head Size (in)	Weight (kg) approx
½”	15	79	70	0.48 (12.2mm)	1.2
¾”	20	92	80	0.48 (12.2mm)	1.6
1″	25	111	95	0.60 (15.2mm)	2.3
1¼”	32	120	105	0.60 (15.2mm)	3.0
1½”	40	152	120	0.75 (19.1mm)	4.2
2″	50	172	140	0.75 (19.1mm)	6.0
2½”	65	195	165	0.88 (22.4mm)	9.5
3″	80	210	185	0.88 (22.4mm)	13.5
4″	100	254	225	1.00 (25.4mm)	21.0
(Note: Dimensions are for reference only. Refer to certified GA drawing for exact dimensions.)

Special Requirements / Options

Jmenovitý tlak: Class 125 / Class 150
Konec připojení: NPT / BSP (Parallel or taper)
Seat Type: Integral / Renewable bronze seat rings
Wedge Material: Bronze (Standard) / Cast Iron with Bronze overlay / Stainless Steel
Materiál představce: Brass (Standard) / Stainless Steel (304/316) / Bronze
Typ kapoty: Screwed-in bonnet / Bolted bonnet
Packing Material: Graphite / PTFE / Non-asbestos
Square Head Size: Standard as above / Custom
Test Certificate: EN 10204 Type 2.2 / 3.1
Special Cleaning: For potable water / Oxygen service
NACE Compliance: MR0175 (Requires material upgrade)
Příslušenství: Locking device / Extension stem / Position indicator

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.
Square Head Operation: Allows operation with a standard wrench or T-handle. No handwheel reduces overall height and cost.
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 square head 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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