Resilient Seated Non-rising Stem Gate Valve c/w Key Operator

Description

Technical Data Sheet

Resilient-Seated Non-Rising Stem (NRS) Gate Valve
(T-wrench Operation with Square Socket)
Size: DN450 | Pressure: PN16

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1. General Description

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

• Seat Type: Soft Sealing (Rubber Encapsulated Wedge)

• Operation: Square Socket for T-wrench (Extension spindle compatible)

• Visual Indication: Not applicable (NRS design – valve position is not visually indicated by the stem)

• Design Standard: DIN 3352 / BS 5163 / EN 1074-1 & 2

• Ends: Flanged to EN 1092-2 PN16

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

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

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2. Application

• Suitable for: Potable water, wastewater, sewage, irrigation, and neutral liquids.

• Temperature Range: 0°C up to +80°C (EPDM)

• Pressure Rating: PN16 (16 bar)

• Typical Installation: Buried service (with extension spindle), valve pits, floor-mounted installations where space is limited.

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3. Technical Parameters (DN450 PN16)

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4. Materials of Construction

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5. Features

• Non-Rising Stem (NRS): Stem does not rise during operation – ideal for buried or confined spaces.

• Resilient Seated: Wedge fully encapsulated in EPDM rubber provides bubble-tight shut-off (zero leakage).

• T-Wrench Operation: Valve is fitted with a square socket (female) designed for operation by a T-wrench or extension spindle with matching square drive.

• Corrosion Protection: Full epoxy coating inside and out prevents corrosion and is suitable for potable water.

• No Pocket Design: Smooth bore prevents debris accumulation.

• Bi-directional Sealing: Seals effectively in both flow directions.

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6. Square Socket (T-Wrench Connection) Details – DN450

Note: The exact square drive size may vary slightly between manufacturers. Please confirm when ordering.

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7. Dimensions & Weight (DN450 PN16)

*(Dimensions based on EN 558-1 Series 3 and EN 1092-2 PN16 standards. Request certified drawing for exact values. )*

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8. Operation Details

• Type of Operation: Square socket for T-wrench.

• Operation Torque: Designed for manual operation using a standard T-key. Maximum recommended torque: approx. 400 Nm (consult manufacturer for exact value).

• Direction to Close: Clockwise (standard).

• Turns to Open: Approximately 45 – 50 turns (full open to full close).

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9. Testing

• Shell Test: 24 bar – No visible leakage.

• Seat Test: 17.6 bar – Rate A (Zero Leakage / Bubble Tight) for resilient seated valves.

• Optional Tests: Low-pressure air test, vacuum test.

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10. Notes & Selection Tips

1. Resilient Seated: This valve provides bubble-tight shut-off (zero leakage), unlike metal-seated valves.

2. Non-Rising Stem: Suitable where space is limited or for buried installations. Note: There is no visual indication of valve position – position must be determined by counting turns or using a position indicator on the operating key.

3. T-Wrench Operation: Standard supply includes the square socket only. The T-wrench operating key, extension spindles, and floor box must be ordered separately.

4. Epoxy Coating: Fusion-bonded epoxy coating meets potable water approvals (e.g., WRAS, ACS).

5. DN450 Note: This is a less common size than DN400 or DN500. Confirm availability and lead time with the manufacturer.

6. Operating Torque: Due to the large size (DN450), the operating torque is significant. Ensure the T-wrench and operator are adequately sized.

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11. Ordering Information

To ensure correct selection, please specify:

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This data sheet is a guideline based on standard industry practice. Always refer to the manufacturer’s certified drawings for exact dimensions and ratings.