60" Class 150 Extended Bonnet Buried Double Offset Rubber Seated Butterfly Valve
60" Class 150 Extended Bonnet Buried Double Offset Rubber Seated Butterfly Valve - Image 2
60" Class 150 Extended Bonnet Buried Double Offset Rubber Seated Butterfly Valve - Image 3
60" Class 150 Extended Bonnet Buried Double Offset Rubber Seated Butterfly Valve - Image 4

60″ Class 150 Extended Bonnet Buried Double Offset Rubber Seated Butterfly Valve

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Description

TECHNICAL DATA SHEET

Product: 60″ Class 150 Extended Bonnet Buried Double Offset Rubber Seated Butterfly Valve
Document No.: TDS-BFV-DO-600-150-EXT-REV1
Date: 24-June-2026

1. VALVE DESCRIPTION

The valve is a double offset (double eccentric), rubber seated butterfly valve engineered for buried service in water and wastewater applications. The design features an extended bonnet and stem to place the operator above ground. The double offset geometry ensures low-torque operation and bubble-tight sealing with minimal seat wear. For underground corrosion resistance, the valve exterior is protected with a specialized coal tar paint system.

2. DESIGN STANDARDS

  • Valve Design: API 609 Category B (Double Flanged, Double Offset)

  • Pressure/Temperature Rating: ASME B16.34 Class 150

  • Flange Drilling: ASME B16.47 Series A (MSS SP-44) / ASME B16.5 compatible

  • Face-to-Face: Manufacturer’s standard for buried service, based on API 609

  • Testing & Inspection: API 598 (Zero Leakage)

  • Buried Service Extension: Designed per AWWA M44

3. TECHNICAL SPECIFICATIONS

Parameter Value
Nominal Diameter (NPS) 60 inch (DN 1500)
Pressure Class Class 150 (PN 20)
Valve Type Double Offset, Rubber Seated, Buried Service
Connection Type Double Flanged
Operation Manual Gear Operator with Extended Stem and Handwheel
Leakage Rate Zero Leakage (API 598, resilient seated)
Flow Direction Bi-directional, dead-end service capable
Max. Working Pressure (Water @ 38°C) 19.6 bar (285 psi)
Shell Test Pressure 29.3 bar (425 psi)
Seat Test Pressure 21.6 bar (313 psi)
Face-to-Face Dimension Per manufacturer’s standard for buried valves

4. MATERIALS OF CONSTRUCTION

Component Material Standard / Grade
Body Ductile Iron ASTM A536 Gr. 65-45-12 / EN-GJS-500-7
Disc Ductile Iron ASTM A536 Gr. 65-45-12, Coated
Seat EPDM Rubber Fully integrated, field replaceable
Stem (Shaft) Stainless Steel AISI 420 (1.4021) or AISI 316
Extension Stem Stainless Steel AISI 304 (1.4301)
Extension Tube (Bonnet) Carbon Steel ASTM A53 / S235, External Coal Tar Paint
Stem Bearings PTFE lined / Bronze Self-lubricating
Packing PTFE / Graphite Adjustable, located at top of extension tube
Gearbox Housing Ductile Iron / Cast Iron Fully enclosed, lubricated for life
Handwheel Ductile Iron / Steel Rising-non-rising indicator
Floor Plate Carbon Steel External Coal Tar Paint

5. CORROSION PROTECTION (CRITICAL FOR BURIED SERVICE)

Per client specification, the external surfaces of the buried valve are protected by a Coal Tar Paintsystem, a specialized coating highly resistant to soil corrosion, moisture, and microbiological attack.

  • External Coating System (Body, Bonnet, Extension Tube):

    • Material: Coal Tar Enamel Paint / Coal Tar Epoxy Paint

    • Application System: 1 coat of coal tar primer + 2 coats of coal tar finish.

    • Minimum Dry Film Thickness: 400 µm (16 mils).

    • Surface Preparation: Abrasive blast cleaning to Sa 2.5 (ISO 8501-1) / SSPC-SP10.

    • Properties: Excellent adhesion, high electrical resistivity, impervious to water and aggressive soils.

  • Internal Coating (Wetted Parts):

    • Material: Fusion Bonded Epoxy (FBE), min. 250 µm.

    • Certification: Suitable for potable water (WRAS / NSF 61 optional).

    • Color: Blue or black.

6. DOUBLE OFFSET DESIGN FEATURES

  • 1st Offset: Stem axis offset from the seat plane, allowing friction-free disengagement.

  • 2nd Offset: Stem axis offset from pipe centerline, ensuring a continuous uninterrupted sealing surface.

  • EPDM Seat: Excellent aging resistance, bubble-tight shutoff, and long service life in water.

7. EXTENDED BONNET / BURIED SERVICE DETAILS

  • Configuration: Flanged extension bonnet with anti-corrosion coating.

  • Extension Length: Customized to client’s depth of cover (ground to pipe crown).

  • Indicator: Visual position indicator integrated in the gearbox.

  • Optional Accessories: 2″ square operating nut, street box, floor stand.

8. TESTING & CERTIFICATION

  • Hydrostatic testing per API 598: Shell (1.5x) and Seat (1.1x) with zero leakage.

  • Material certificates to EN 10204-3.1 available on request.

  • Coating inspection: Holiday testing at 1000V to ensure pinhole-free application of coal tar paint.

9. APPLICATIONS

Ideal for underground on/off and throttling service in:

  • Raw water transmission mains

  • Potable water distribution

  • Wastewater treatment

  • Irrigation networks

Note: Final dimensions and weights provided in the certified general arrangement drawing after order placement.

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