DIN Rubber Seated NRS Gate Valve（Key)

Valve Type Non-Rising Stem (Dark Rod) Resilient Seated Gate Valve
Design Standard DIN 3352
Face-to-Face DIN 3202 F5 (Short pattern) / F4 (Long pattern)
Flange Standard EN 1092-2 / DIN 2501 / DIN 2533
Inspection & Test DIN 3230 / EN 12266-1
Pressure Rating PN10 / PN16 / PN25
Size Range DN40 – DN600 (1½” – 24″)
Temperature Range -10°C to +80°C (Standard EPDM) / Up to +120°C (Special compounds)
End Connection Flanged (Double flanged)

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Sự miêu tả

Technical Datasheet: German Standard Non-Rising Stem Resilient Seated Gate Valve

General Information

Item	Standard Configuration	User Specification / Remarks
Loại van	Non-Rising Stem (Dark Rod) Resilient Seated Gate Valve	Wedge type, soft seal
Design Standard	DIN 3352	Part 2 or Part 4
Đối mặt	DIN 3202 F5 (Short pattern) / F4 (Long pattern)
Flange Standard	EN 1092-2 / DIN 2501 / DIN 2533	PN6 / PN10 / PN16 / PN25
Inspection & Test	DIN 3230 / EN 12266-1
Xếp hạng áp suất	PN10 / PN16 / PN25
Size Range	DN40 – DN600 (1½” – 24″)	Larger sizes available upon request
Phạm vi nhiệt độ	-10°C to +80°C (Standard EPDM) / Up to +120°C (Special compounds)
End Connection	Flanged (Double flanged)
Hoạt động	Handwheel / Square nut / Bevel gear / Electric actuator
Ứng dụng	Water, Wastewater, Potable water, Irrigation, Fire protection

Design Features

Feature	Sự miêu tả	Benefit
Non-Rising Stem Design	Stem thread is inside the valve body; stem does not rise when opening/closing	Ideal for limited installation space, buried service
Fully Rubber Encapsulated Wedge	Ductile iron wedge fully covered with EPDM/NBR rubber	Excellent corrosion resistance, bubble-tight shut-off
Wedge-Type Design	Wedge shape provides self-centering and tight sealing	Reliable sealing even with debris or pipe misalignment
Full Bore / Straight Through	No pockets or recesses for debris accumulation	Low pressure drop, self-cleaning
Triple O-Ring Stem Sealing	Multiple O-rings on stem	Prevents external leakage, low operating torque
Blow-Out Proof Stem	Stem retained by internal shoulder	Enhanced safety under pressure
Epoxy Coating	Internal and external fusion bonded epoxy coating	Excellent corrosion protection, potable water approved
No Bolted Bonnet Exposed	Bonnet bolts are recessed and sealed	Prevents corrosion of bonnet fasteners

Bill of Materials (Main Components)

No.	Part Name	Standard Material	Optional Material	Nhận xét
1	Thân hình	Gang dẻo (GGG-50 / EN-GJS-500-7)	Cast Iron (GG-25)	Epoxy coated
2	Bonnet / Cover	Gang dẻo (GGG-50)	Cast Iron	Epoxy coated
3	Wedge / Gate	Ductile Iron + Fully EPDM/NBR Encapsulated	Fully rubber coated
4	Thân cây	Stainless Steel (AISI 420 / 2Cr13)	AISI 304 / AISI 316 / Monel	Blow-out proof
5	Stem Nut	Brass / Bronze	Ductile Iron + Bronze insert
6	Seal Ring (Bonnet)	EPDM / NBR O-Ring	Bonded / Loose type
7	Stem Seals	O-Rings (EPDM / NBR / Viton)	Triple sealing
8	Gland / Packing	EPDM / NBR / PTFE
9	Thrust Washer	PTFE / Bronze
10	Handwheel / Square Nut	Gang dẻo / Malleable Iron	Epoxy coated
11	Fasteners (Bonnet)	Stainless Steel (A2 / A4)	Recessed & sealed
12	Nameplate	Stainless Steel / Aluminum

Technical Parameters & Performance

Item	Đặc điểm kỹ thuật
Medium	Water, Potable Water, Wastewater, Seawater, Air, Mild Chemicals
Operating Temperature	EPDM: -10°C to +80°C (Peak +120°C intermittent) / NBR (Buna-N): -10°C to +70°C / Viton: -20°C to +150°C
Max Operating Pressure	PN10 (10 bar / 145 psi) / PN16 (16 bar / 232 psi) / PN25 (25 bar / 363 psi)
Seat Type	Resilient Soft Seat – Fully encapsulated wedge
Sealing Performance	Zero Leakage (Bubble tight) – EN 12266-1 Rate A
Flow Direction	Bidirectional
Flow Characteristic	On-Off (Not for throttling/regulation)
Wedge Type	Solid wedge / Flexible wedge
Stem Type	Non-rising stem (Inside screw)
Suitable for	Isolation service, buried installation

Test Pressure (Reference: Per DIN 3230 / EN 12266-1)

Xếp hạng áp suất	Shell Test (Hydrostatic)	Seat Test (Hydrostatic)	Low Pressure Seat Test (Pneumatic)
PN10	15 bar (1.5 MPa)	11 bar (1.1 MPa)	0.6 bar (60 kPa)
PN16	24 bar (2.4 MPa)	17.6 bar (1.76 MPa)	0.6 bar (60 kPa)
PN25	37.5 bar (3.75 MPa)	27.5 bar (2.75 MPa)	0.6 bar (60 kPa)
(Note: Tests performed per EN 12266-1 / DIN 3230)

Dimensions & Weight (Reference: DIN 3202 F5 Short Pattern / PN16)

DN (mm)	NPS (in)	L (Face-to-Face) mm	H (Closed) mm (approx)	Weight (kg) approx
40	1½”	140	160	6
50	2″	150	175	8
65	2½”	170	195	11
80	3″	180	215	14
100	4″	190	250	20
125	5″	200	285	28
150	6″	210	315	38
200	8″	230	380	60
250	10″	250	450	90
300	12″	270	525	125
350	14″	290	580	160
400	16″	310	640	210
450	18″	330	700	260
500	20″	350	760	320
600	24″	390	880	450
(Note: For F4 long pattern, add approximately 20-30mm to length. For exact dimensions, refer to certified GA drawing. Add actuator weight separately.)

Special Requirements / Options

Xếp hạng áp suất: PN10 / PN16 / PN25
Đối mặt trực tiếp: F4 (Long pattern) / F5 (Short pattern)
Seat Material: EPDM (Standard for water) / NBR (Buna-N) / Viton (FKM) / Silicone
Vật liệu thân máy: Ductile Iron GGG-50 (Standard) / Cast Iron GG-25 / WCB / Stainless Steel
Wedge Material: Ductile Iron + EPDM (Standard) / Ductile Iron + NBR / Stainless Steel
Vật liệu thân: Stainless Steel 420 (Standard) / 304 / 316 / 17-4PH / Monel
Hoạt động: Handwheel (Standard) / Square nut for buried service / Bevel gear / Electric actuator / Pneumatic actuator
Stem Extension: Yes / No (For buried service)
Position Indicator: Yes / No (For buried service)
Lớp phủ: Epoxy coating (Min. 250 microns) – Color: Blue RAL 5017 / RAL 5005 / Custom
Potable Water Approval: WRAS / ACS / NSF 61 / KTW / DVGW
Test Certificate: EN 10204 Type 2.2 / 3.1
Special Cleaning: For potable water / Food grade

Design Notes:

Non-Rising Stem (Dark Rod) Design: The stem rotates but does not move linearly. The threaded section is inside the valve body and protected from the environment. This design is ideal for installations with limited headroom and for buried service where a valve key (square nut) is used for operation.
Resilient Seated / Soft Seal: The wedge is fully encapsulated with rubber (EPDM or NBR). When closed, the rubber compresses against the body seat, providing bubble-tight shut-off and accommodating minor pipe misalignment or debris.
Full Bore: The straight-through full bore design offers minimal resistance to flow and allows for pigging and cleaning operations.
Triple O-Ring Stem Sealing: Multiple O-rings on the stem ensure positive sealing against external leakage and reduce operating torque.

Material Notes:

Ductile Iron GGG-50 (EN-GJS-500-7): High strength, excellent ductility and impact resistance. Standard material for European standard valves.
EPDM (Ethylene Propylene Diene Monomer): Excellent resistance to hot water, steam, ozone, UV, and mild chemicals. Ideal for potable water and wastewater. Not suitable for oils or hydrocarbons.
NBR (Nitrile / Buna-N): Good resistance to oils, fuels, and hydrocarbons. Suitable for oil-contaminated water.
Stainless Steel Stem: Provides corrosion resistance and long service life.

Application Notes:

Suitable for: Potable water distribution, wastewater treatment, irrigation, fire protection systems, industrial cooling water, and buried pipelines.
Not suitable for: Throttling or regulating service (use butterfly or globe valve instead). For high-temperature steam or aggressive chemicals, consult manufacturer.
Installation: Can be installed in any position. For buried installation, use square nut operation and stem extension if required.

Note: This datasheet is prepared for a German Standard (DIN) Non-Rising Stem Resilient Seated Gate Valve per DIN 3352 / DIN 3202 / EN 1092-2. Ensure selected materials, pressure rating, and seat elastomer are compatible with the specific service conditions (medium, temperature, pressure, and environmental requirements).

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