BS NRS Rubber Seated Gate Valve c/w Key Operator

Valve Type Resilient Seated Gate Valve
Stem Type Non-Rising Stem (NRS)
End Connection Flanged, Raised Face (RF) / Flat Face (FF)
Nominal Size DN50 – DN600 (2″ – 24″)
Pressure Rating PN10 / PN16 / PN25
Body Material Ductile Iron / Cast Iron
Operation Handwheel / T-Key / Bevel Gear
Service Medium Water / Oil / Gas / General Purpose

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설명

TECHNICAL DATA SHEET

British Standard Resilient Seated Non-Rising Stem Gate Valve

BASIC VALVE INFORMATION

Item	사양
밸브 유형	Resilient Seated Gate Valve
Stem Type	Non-Rising Stem (NRS)
End Connection	Flanged, Raised Face (RF) / Flat Face (FF)
공칭 크기	DN50 – DN600 (2″ – 24″)
압력 등급	PN10 / PN16 / PN25
본체 재질	Ductile Iron / Cast Iron
작업	Handwheel / T-Key / Bevel Gear
Service Medium	Water / Oil / Gas / General Purpose

APPLICABLE CODES & STANDARDS

기준	설명
BS 5163-1 / BS 5163-2	Specification for resilient-seated gate valves for waterworks purposes
BS 5150	Specification for cast iron gate valves (flanged and spindle operated)
EN 558-1	Face-to-face dimensions for metal valves for use in flanged pipe systems (PN designated)
BS EN 1092-2	Flanges and their joints – Circular flanges for pipes, valves, fittings and accessories, Part 2: Cast iron flanges
BS 4504	Circular flanges for pipes, valves and fittings (PN designated)
BS 10	Specification for flanges and bolting for pipes, valves and fittings (Tables D/E)
BS 6755 / ISO 5208	Testing of valves – Pressure test requirements
ISO 7259	Predominantly key-operated cast iron gate valves for underground use
WRAS / ACS	Potable water approval (if required)

MATERIALS OF CONSTRUCTION

요소	재료	Standard / Remarks
몸	Ductile Iron (GGG50) / Cast Iron (GG25)	EN-GJS-400 / EN-GJL-250
Bonnet / Cover	Ductile Iron / Cast Iron	Same as body
Gate / Wedge	Ductile Iron + Fully Encapsulated EPDM/NBR	100% rubber covered, fusion bonded
줄기	Stainless Steel (AISI 304 / 316) Brass / Bronze (Optional)	2Cr13 / SS304 / SS316
Stem Nut	Brass / Bronze / Ductile Iron	High strength, wear resistant
Seat (Body)	Integral / EPDM bonded	Rubber molded to body or gate
O-Rings / Seals	EPDM / NBR / Viton	3 O-rings on stem for blowout proof sealing
Bolting / Nuts	Stainless Steel / Zinc Plated Carbon Steel	A2 / A4 Stainless Steel (for corrosion resistance)
Gasket (Bonnet)	O-Ring type / Spiral Wound	Self-sealing design, pressure energized
Coating	Epoxy Coating (FBE)	Internal & external, RAL 5012 (blue) / RAL 5005, certified for potable water
Handwheel	연성 주철	With direction indicator (open/close)

DESIGN & PERFORMANCE CHARACTERISTICS

매개변수	사양
Pressure Class	PN10 / PN16 / PN25 (as specified)
Working Pressure	10 bar / 16 bar / 25 bar
Shell Test Pressure	1.5 x Rated Pressure (e.g., PN16 → 24 bar)
Seat Test Pressure	1.1 x Rated Pressure (e.g., PN16 → 17.6 bar)
Low Pressure Seat Test	5–6 bar – Zero leakage
Design Temperature Range	-10°C to +80°C (standard EPDM) -20°C to +120°C (special compounds)
Leakage Rate	Zero leakage (Rate A per ISO 5208 / BS 6755)
Flow Characteristic	Full bore, linear (on-off service only)
Operation Torque	Low torque design (≤80% of standard requirement)
Stem Sealing	3 O-rings + Wiper ring – blowout proof, no external leakage
Direction of Closing	Clockwise to close (handwheel)
Position Indication	Visual indicator on stem / handwheel (open/close)

DIMENSIONS & CONNECTIONS

Item	Dimension (mm / inch)
Flange Standard	BS EN 1092-2 / BS 4504 / BS 10 Table D/E
Flange Drilling	PN10 / PN16 / PN25 drilling (as per EN 1092-2)
Face-to-Face Length	EN 558-1 Series 14 (Basic Series 14 for resilient seated gate valves) Example: DN80 → 203 mm, DN100 → 229 mm, DN150 → 267 mm
Flange Face	Raised Face (RF) or Flat Face (FF)
Overall Height	Per BS 5163 / Manufacturer standard
Stem Diameter	Per BS 5163 Table 4 (minimum requirements)
Handwheel Diameter	As per torque requirements
Weight	Approx. _____ kg (depending on size)

TESTING & INSPECTION

Test	Standard / Requirement
Shell Test	BS 6755 / ISO 5208 – 1.5 x PN – No visible leakage
Seat Test (High Pressure)	1.1 x PN – Zero leakage
Seat Test (Low Pressure)	5–6 bar – Zero leakage
Stem Seal Test	Visual inspection during operation
Coating Test	Holiday detection, thickness measurement (250–300 microns)
Material Certification	EN 10204 3.1 / 2.2 (if required)
WRAS / ACS Approval	For potable water applications (optional)

SPECIAL REQUIREMENTS & REMARKS

Resilient Seated Design

Gate is fully encapsulated with EPDM/NBR rubber using injection molding process .
No exposed metal on gate – ensures 100% bubble-tight shut-off.
Rubber bonded to ductile iron – no delamination, long service life.

Non-Rising Stem (NRS)

Stem does not rise when valve opens/closes.
Suitable for buried service or limited space installations.
Stem threads isolated from line media.

Anti-Corrosion Coating

Fusion Bonded Epoxy (FBE) coating inside and out.
Certified for potable water (WRAS / ACS / KTW).
Color: Blue (RAL 5012) / Black / Custom.

Blowout-Proof Stem

Stem retained by shoulder inside body.
Triple O-ring sealing – no external leakage.

Zero Leakage Performance

Resilient seat design ensures tight shut-off even with debris.
Self-cleaning wedge action.

Optional Accessories

T-Key operation (for buried service).
Extension spindle for deep burial.
Position indicator / opening limiter.
Gearbox for larger sizes.

보증:

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