Non-Rising Stem (NRS) Resilient-Seated Gate Valve
Non-Rising Stem (NRS) Resilient-Seated Gate Valve - Image 2

Non-Rising Stem (NRS) Resilient-Seated Gate Valve

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Description

Technical Data Sheet

Non-Rising Stem (NRS) Resilient-Seated Gate Valve
(British Standard – BS 5163 / EN 1074)

1. General Description

  • Product Type: Flanged End, Non-Rising Stem (NRS), Resilient-Seated Gate Valve (Sluice Valve)

  • Seat Type: Soft Sealing (Rubber Encapsulated Wedge) – Zero Leakage

  • Operation: Handwheel / Square Nut for T-wrench (Optional)

  • Design Standard: BS 5163 Type A / EN 1074-1 & 2 / EN 1171

  • Ends: Flanged to BS 4504 / EN 1092-2 PN10/PN16

  • Face-to-Face: EN 558-1 Series 3 (DIN 3202 F4) / BS 5163

  • Test Standard: EN 12266-1 (ISO 5208) / BS 6755

  • Pressure Rating: PN10 / PN16

2. Application

  • Suitable Media: Potable water, wastewater, sewage, seawater, irrigation, and neutral liquids

  • Temperature Range: -10°C up to +80°C (EPDM)

  • Pressure Rating: PN10 (10 bar) / PN16 (16 bar)

  • Typical Installation: Water supply networks, treatment plants, buried service (with extension spindle), fire protection systems, HVAC

3. Technical Parameters

Parameter PN10 PN16
Nominal Diameter Range DN40 – DN600 DN40 – DN600
Working Pressure 10 bar (1.0 MPa) 16 bar (1.6 MPa)
Shell Test Pressure 15 bar (1.5 x PN) 24 bar (1.5 x PN)
Seat Test Pressure 11 bar (1.1 x PN) 17.6 bar (1.1 x PN)
Leakage Rate Zero Leakage (Rate A – Bubble Tight)
Operating Temperature -10°C to +80°C (EPDM) / -10°C to +110°C (EPDM high temp)
Flange Drilling EN 1092-2 PN10 / PN16 (dual drilling optional)
Face-to-Face EN 558-1 Series 3 (DIN 3202 F4)
Flow Design Full Bore (100% port) – Low pressure drop

4. Materials of Construction

Component Material Standard / Notes
Body Ductile Iron (GGG-50 / EN-GJS-500-7) EN 1563 standard
Wedge / Gate Ductile Iron + Full EPDM Encapsulation No iron exposed to medium – prevents corrosion
Stem Stainless Steel (AISI 410 / 420 / 304 / 1Cr17Ni2) Rolled threads for high strength
Stem Nut Brass / Bronze / ZCuAl10Fe3 High strength, low friction
Body Seat EPDM (integral with wedge encapsulation) Bonds to wedge, seals against body
Stem Seals EPDM O-Rings (3 pcs) + Dust Seal Triple O-ring design for reliability under pressure
Bonnet Gasket EPDM / NBR Compressed between body and bonnet
Bonnet Ductile Iron (GGG-50) EN-GJS-500-7
Bolting Stainless Steel / Zinc-Plated Steel Gr.8.8 + Wax Corrosion protected
Thrust Collar/Washer Brass + PTFE For low torque operation
Dust Cover NBR / EPDM Protects stem top
Handwheel / Operating Nut Ductile Iron Handwheel or square socket option
Coating Fusion Bonded Epoxy (DIN 3476-1 / EN 14901) Min. 250µm thickness, Blue RAL 5005 – potable water approved

5. Key Features

Feature Benefit
Non-Rising Stem (NRS) Stem does not rise during operation – ideal for buried or confined spaces where vertical clearance is limited
Resilient Seated (EPDM Encapsulated Wedge) Bubble-tight shut-off (zero leakage) – outperforms metal-seated valves
Full Bore Design Smooth bore prevents debris accumulation; minimal pressure drop
Triple O-Ring Stem Seals Allows replacement of stem seals under pressure(when valve fully open); ensures long-term leak-free operation
Fusion Bonded Epoxy Coating Excellent corrosion resistance inside and out; suitable for potable water (WRAS/ACS approved)
Bi-directional Sealing Seals effectively in both flow directions
Low Operating Torque Guides in wedge and body ensure smooth, uniform closure; prevents overloading of stem
Interchangeable Design Fully complies with BS 5163 / EN 558-1 for interchangeability with other manufacturers

6. Dimensions & Weights (Reference Values – PN16)

*Note: Dimensions based on EN 558-1 Series 3 and EN 1092-2 PN16. Flanges often have dual drilling for PN10/PN16. H = height to top of operating nut/handwheel (closed position). Request certified drawing for exact dimensions. *

DN (mm) L (Face-to-Face) mm D (Flange OD) mm PCD (Bolt Circle) mm No. Bolts – Ø H (approx.) mm Weight (approx.) kg
50 178 165 125 4 – 19 226 – 280 7 – 15
65 190 185 145 4 – 19 265 – 305 9 – 18
80 203 200 160 8 – 19 288 – 350 11 – 22
100 229 220 180 8 – 19 320 – 390 13.5 – 28
125 254 250 210 8 – 19 364 – 470 11 – 35
150 267 285 240 8 – 23 389 – 525 13 – 45
200 292 340 295 12 – 23 481 – 630 17 – 68
250 330 405 355 12 – 28 559 – 780 21 – 95
300 356 460 410 12 – 28 655 – 870 25 – 130
350 381 520 470 16 – 28 751 – 1100 29 – 170
400 406 580 525 16 – 31 905 – 1200 33 – 220
450 432 640 585 20 – 31 1008 – 1300 37.5 – 280
500 457 715 650 20 – 34 1114 – 1450 41.5 – 350
600 508 840 770 20 – 37 1251 – 1650 50 – 500

(Note: Weight varies significantly between manufacturers – light body and heavy body designs available . Height varies with operator type.)

7. Operation Options

Operation Type Description
Handwheel Standard for above-ground installations; ductile iron handwheel
Square Socket (T-wrench) For buried service or where handwheel is not required; square nut size varies by DN (typically 8mm – 27mm)
Extension Spindle For buried valves; includes floor box and operating key (specify length)
Gear Operation For larger sizes (DN350+) where operating torque is high

  • Direction to Close: Clockwise (standard)

  • Backseating: Allows packing replacement under pressure when valve fully open

8. Testing (Per EN 12266-1 / BS 6755)

Test Test Pressure (PN16) Acceptance Criteria
Shell Hydrostatic Test 24 bar (1.5 x PN) No visible leakage through pressure boundary
Seat Leakage Test 17.6 bar (1.1 x PN) Zero leakage (Rate A – Bubble Tight) for resilient seated valves
Backseat Test 17.6 bar No visible leakage when valve fully open

9. Coating Specification

  • Type: Fusion Bonded Epoxy (FBE)

  • Standard: DIN 3476-1 / EN 14901 / AWWA C550

  • Thickness: Min. 250 microns

  • Color: Blue RAL 5005 (standard) or as specified

  • Approvals: Suitable for potable water (WRAS, ACS, KTW upon request)

10. Installation & Operation Notes

  1. Non-Rising Stem: The stem does NOT rise during operation. Valve position cannot be visually determined from stem position – use position indicators on extension spindle or count turns .

  2. Resilient Seated: This valve provides bubble-tight shut-off (zero leakage) – suitable for isolation applications requiring tight sealing .

  3. Flow Direction: Suitable for bi-directional flow – no specific orientation required .

  4. Installation Position: Can be installed in any position; for vertical pipelines, flow direction upward is recommended.

  5. Buried Service: For buried installations, specify extension spindle length and floor box with operating square .

  6. Flange Gaskets: Standard gaskets suitable for PN16 flanges should be used.

  7. Maintenance: Stem seals can be replaced under pressure when valve is fully open (backseat feature) .

11. Options & Accessories

  • Stem Material: Stainless Steel 304 / 316

  • Seal Material: NBR (for oil applications) / Viton (for higher temperature)

  • Coating: Special colors / higher thickness / marine grade

  • Operation: Handwheel / Square nut / Gearbox / Electric actuator / Pneumatic actuator

  • Accessories: Extension spindles, floor boxes, T-keys, position indicators

  • Certification: Material certificates (EN 10204 3.1), WRAS, ACS, UL/FM (upon request)

12. Ordering Information

To ensure correct selection, please specify:

Item Specification
Valve Type NRS Resilient Seated Gate Valve – BS 5163
Size (DN) ______ mm
Pressure Rating PN10 / PN16
Flange Standard EN 1092-2 PN10/PN16
Operation Handwheel / Square Nut
Wedge Material EPDM encapsulated
Stem Material Stainless Steel
Coating Fusion bonded epoxy (blue RAL 5005)
Accessories T-wrench, extension spindle, floor box (if required)
Certification Material certs / WRAS / etc.

This data sheet is a guideline based on standard industry practice for British Standard Non-Rising Stem Resilient-Seated Gate Valves . Always refer to the manufacturer’s certified drawings for exact dimensions and ratings.

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