Resilient Seated Gate Valve with Bubble-Tight Sealing Low Operating Torque and PN 16 Pressure Rating in Ductile Iron

Product Data Sheet: Resilient Seated Gate Valve (PN 16, F4) - Ductile Iron

1. Product Overview
The Resilient Seated Gate Valve (PN 16, F4) is a high-performance, bidirectional sealing valve designed for isolation service in a wide range of piping applications. Manufactured from ductile iron (GGG-40/50 per EN-GJS-500-7/EN 1563), it offers an optimal balance of strength, durability, and corrosion resistance. The key feature is its elastomer-encapsulated wedge, which ensures bubble-tight sealing, low operating torque, and reliable performance in water, wastewater, and other neutral media.

2. Key Features & Benefits

• Bubble-Tight Sealing: The fully encapsulated resilient wedge (seating face) compresses against the valve body seat, providing excellent sealing integrity in both flow directions, minimizing leakage risk.

• Low Operating Torque: The non-lubricated, resilient seal design significantly reduces friction, allowing for easier and smoother operation compared to metal-seated gates, even after prolonged periods of inactivity.

• Ductile Iron Construction: Offers superior tensile strength and impact resistance compared to grey cast iron, with good pressure-bearing capability and resistance to mechanical stress.

• Full Bore Design: Provides minimal pressure drop across the valve when fully open, ensuring efficient system flow and reducing pumping energy costs.

• PN 16 Pressure Rating: Suitable for a maximum working pressure of 16 bar (1.6 MPa / 232 psi) at 20°C (68°F). Pressure-temperature ratings adjust according to seal material.

• F4 Face-to-Face Dimension: Compliant with EN 558-1 Series 4 / ISO 5752, ensuring direct interchangeability and easy replacement in existing piping networks.

• Corrosion Protection: Standard epoxy coating (approx. 250 µm) per EN 14901, typically RAL 5012 or equivalent, provides excellent internal and external corrosion protection for both buried and above-ground service.

• Fire-Safe Option: Available with design compliant to API 607/API 6FA or ISO 10497 fire-test requirements upon request.

3. Technical Specifications

• Design & Manufacturing Standards: EN 1171, ISO 5208 (Leakage Rate A), EN 1074-1/-2, ISO 17292 (optional).

• Pressure Rating: PN 16 (Standard). Class 125 available as per customer requirement.

• Size Range: DN 50 (2") to DN 600 (24") (typical range, subject to manufacturer).

• Body & Bonnet Material: Ductile Iron, grade GGG-40/50 (EN-GJS-500-7).

• Wedge (Disc): Ductile Iron, fully encapsulated in EPDM or NBR elastomer (standard). Other elastomers (e.g., FKM/Viton, CR) available for specific fluids/temperatures.

• Stem: Stainless Steel (AISI 430 or equivalent), with anti-blowout design.

• Seat: Integral with body; the encapsulated wedge seals directly against the precision-machined body bore.

• Gasket & Packing: NBR or EPDM standard. Other materials available.

• Operators: Handwheel (fixed or portable) standard. Gear operator recommended for sizes ≥ DN 300. Electric, pneumatic, or hydraulic actuators can be fitted.

4. Sealing Elastomer Options

• EPDM (Ethylene Propylene Diene Monomer): Standard for water (potable & wastewater), steam (<120°C), weak acids/alkalis, alcohols. Excellent weathering and aging resistance.

• NBR (Nitrile Butadiene Rubber): Standard for oils, fuels, and hydrocarbons. Good abrasion resistance.

• FKM/FPM (Fluorocarbon Rubber - Viton®): For aggressive chemicals, high-temperature services (up to ~180°C), and aromatics. Fire-safe versions available.

• CR (Chloroprene - Neoprene): Good all-around resistance, often used for seawater and mild chemical services.

5. Applications

• Potable Water Distribution

• Wastewater & Sewage Treatment Plants

• Fire Protection Systems

• Irrigation & Water Management

• Industrial Process Water

• Cooling Water Systems

• General Service in Chemical, Petrochemical, and Power Industries (with compatible elastomer)

6. Installation & Operation Notes

• Designed for fully open or fully closed service. Not recommended for throttling or flow control.

• Install with stem orientation upwards (preferred) or horizontal. Vertical stem-down installation may be possible with specific design verification.

• Pipeline must be depressurized before operating the valve.

• Regular functional exercise is recommended for valves in standby service to maintain operational readiness.

7. Ordering Designation
Example: RSGV - DN300 - PN16 - DI - EPDM - F4 - HW
(Resilient Seated Gate Valve, Size DN300, Pressure PN16, Ductile Iron Body, EPDM Seal, Face-to-Face F4, Handwheel Operated)

Bubble-Tight Sealing Gate Valve

Low Operating Torque Gate Valve

PN 16 Pressure Rating Gate Valve

Resilient Seated Gate Valve with Bubble-Tight Sealing Low Operating Torque and PN 16 Pressure Rating in Ductile Iron Images