Bray 36H Series is a large-diameter, fully flanged rubber-lined butterfly valve for NPS 24 to 60 (DN 600 to 1500). It features a ductile iron valve body and a bonded EPDM or BUNA-N seat, providing bidirectional bubble-tight shutoff. The maximum allowable operating pressure is 232 psi (16 bar), making it suitable for isolation in large HVAC main-line shutoff applications and large pipeline terminal services.
Series 36H resilient-seated valve
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Bray 36H Series Large-Diameter Fully Flanged Rubber-Lined Butterfly Valve
Large-diameter fully flanged rubber-lined butterfly valve for HVAC main lines and terminal isolation, providing bidirectional bubble-tight shutoff.
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Specifications
- Nominal Size Range
- NPS 24 to 60 / DN 600 to 1500
- Body Type
- Fully flanged
- Maximum Allowable Operating Pressure
- 232 psi (16 bar); dead-end service: 150 psi (10 bar)
- Operating Temperature Range
- -20°F to 250°F (-29°C to 121°C)
- Shutoff Rating
- Bidirectional bubble-tight shutoff
- Body Material
- Ductile iron
- Disc Material
- Nylon 11-coated ductile iron, 316 stainless steel
- Stem Material
- 17-4 PH stainless steel
- Seat Material
- Bonded EPDM, bonded BUNA-N
- Flange Drilling Standards
- ASME B16.1 Class 125, ASME B16.5 Class 150, ASME B16.47
- Face-to-Face Standards
- API 609 Category A, EN 558 Series 20
- Test Standards
- MSS SP-61, API 598, EN 12266-1
- Certifications
- ATEX, NSF 61/372, PED, PE(S)R, SIL
Application scenarios
Main Pipeline Shutoff in Large HVAC Systems
The Series 36H is suitable for large-diameter main pipelines in large HVAC systems, providing shutoff control. Product documentation explicitly lists HVAC applications. The valve is available in nominal sizes NPS 24 to 60, provides bidirectional bubble-tight shutoff, and has a maximum allowable operating pressure of 232 psi (16 bar).
Terminal Service Isolation for Large Pipelines
The Series 36H can be used for terminal service isolation in large pipelines. Product documentation explicitly states that this series is designed for terminal service, with a maximum allowable operating pressure of 150 psi (10 bar) for terminal service, a fully lugged body, and bidirectional bubble-tight shutoff.
Selection points
Dead-End Service Pressure Rating
This series is explicitly suitable for dead-end service, with a dead-end service pressure rating of 150 psi (10 bar), and can be selected for isolation service at the end of large-diameter pipelines.
Large-Diameter Double-Flanged Connection
This series features a double-flanged butterfly valve design, with nominal sizes ranging from NPS 24 to 60 (DN 600 to 1500). Flange drilling is compatible with ASME B16.1 Class 125, ASME B16.5 Class 150, and ASME B16.47 standards.
Bidirectional Bubble-Tight Sealing
This series is specified for bidirectional bubble-tight sealing and is suitable for applications requiring tight shutoff in both directions.
17-4 PH Stainless Steel Stem
The stem in this series is made of 17-4 PH stainless steel, providing a material selection reference for transmission components in large-diameter butterfly valves.
Installation & maintenance notes
Limit Dead-End Service Operating Pressure
When this Series 36H valve is used in dead-end service, the operating pressure must not exceed 150 psi (10 bar). The maximum allowable operating pressure of 232 psi (16 bar) must not be applied to dead-end service conditions.
FAQ
What is the operating principle of the Series 36H resilient-seated butterfly valve?
The Series 36H is a double-flanged, high-pressure manual resilient-seated butterfly valve that uses disc movement to open and close the flow path, providing dead-end service and bidirectional shutoff. The seal design between the disc and body provides bubble-tight shutoff under both forward and reverse flow, ensuring controlled media flow direction. The specific operating principle must be confirmed based on the sealing material and flange connection of the actual model.
What are the key selection considerations for this valve?
Selection should consider the size range (NPS 24-60 / DN 600-1500), ductile iron body, 17-4 PH stainless steel stem, bonded EPDM/bonded BUNA-N sealing materials, and temperature range (-29°C to 121°C). The maximum allowable operating pressure and flange class must also be confirmed to match system pressure and flange standards.
What pressure ratings and certifications are available for the Series 36H?
The maximum allowable operating pressure is 232 psi (16 bar), with 150 psi (10 bar) for dead-end service. Certifications include ATEX, NSF 61/372, PED, PE(S)R, and SIL, while applicable test standards are MSS SP-61, API 598, and EN 12266-1.
What applications is this valve suitable for?
It is suitable for high-pressure, HVAC, and dead-end service applications, and its large diameter range meets the requirements of large-bore piping. Actual application suitability must be confirmed based on the specific medium, temperature, and site installation conditions.
What should be considered for installation and maintenance, including supplies/repair?
Follow the specified flange drilling standards (ASME B16.1 125, ASME B16.5 150, ASME B16.47) and face-to-face dimensions (API 609 Category A, EN 558 Series 20). Ensure that sealing surfaces are clean, the stem is lubricated, and bolts are tightened to the specified torque. Specific maintenance procedures must be confirmed based on the actual model and application conditions.
Documents
Product Brochure - Resilient-Seated Butterfly ValvesProduct information · EnglishProduct Brochure - Soft-Seated Butterfly ValvesProduct information · EnglishBolting Guide - Typical Flange Bolting Guide (with Washers)Product information · EnglishBolting Guide - Typical Flange Bolting Guide (without Washers)Product information · EnglishIOM Manual - Resilient-Seated Butterfly ValvesManual · EnglishIOM Manual - Bray® Soft-Seated Butterfly ValvesManual · EnglishIOM Manual - Resilient-Seated Butterfly ValvesManual · EnglishSafety Manual - Resilient-Seated Butterfly ValvesManual · EnglishTechnical Sales Manual - Resilient-Seated Butterfly ValvesManual · EnglishTechnical Sales Manual - Soft-Seated Butterfly ValvesManual · EnglishTechnical Sales Manual - Resilient-Seated Butterfly ValvesManual · EnglishRecommended Specification - Series 36H Resilient-Seated Butterfly ValvesProduct information · English