Bray Series 22/23 PTFE-Lined Butterfly Valve

PTFE-lined butterfly valve for isolating pipelines carrying corrosive media, with optional PFA, UHMWPE, and other seat materials.

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Bray Series 22/23 PTFE-lined butterfly valves are designed for isolation in corrosive media piping. Available with wafer or lug-style bodies, they cover nominal sizes from NPS 2 to 24. Seat options include PTFE, conductive PTFE, or UHMWPE, providing bidirectional bubble-tight shutoff at -18°C to 200°C and pressures up to 10 bar for chemical and petrochemical installations.

Specifications

Nominal Size Range: NPS 2 to 24 / DN 50 to 600
Operating Temperature Range: 0°F to 392°F (-18°C to 200°C)
Maximum Allowable Operating Pressure: 150 psi (10 bar)
Body Style: Wafer, lug
Body Materials: Ductile iron, carbon steel, stainless steel
Stem Material: 17-4 PH stainless steel
Seat Materials: PTFE, conductive PTFE, UHMWPE
Disc Materials: Stainless steel, PTFE/SS, PFA/SS, UHMWPE/SS, UHMWPE/DI, Hastelloy®, titanium
Shutoff Class: Bidirectional bubble-tight shutoff
Flange Drilling Standards: ASME B16.1 Class 125, ASME B16.5 Class 150, EN 1092 PN 10, 16
Testing Standards: MSS SP-61, API 598, EN 12266-1
Face-to-Face Standards: MSS SP-67, API 609 Category A, EN 558 Series 20
Seat Energizer Materials: Silicone rubber, FKM
Pipeline Insulation Compatibility: 2 in (50 mm) pipe insulation
Certifications: ABS, ATEX, Bureau Veritas, DNV, PED, PE(S)R, SIL

Application scenarios

Isolation of corrosive media pipelines in chemical and petrochemical applications

Used for isolating corrosive media pipelines in chemical and petrochemical facilities. The product can be configured with corrosion-resistant materials such as PTFE and PFA and provides bidirectional bubble-tight sealing, suitable for operating conditions with temperatures from -18°C to 200°C and a maximum allowable operating pressure of 10 bar.

Selection points

Optional seat and disc material combinations

Seat options include PTFE, conductive PTFE, or UHMWPE; disc options include stainless steel, PTFE/SS, PFA/SS, UHMWPE/SS, UHMWPE/DI, Hastelloy, or titanium. Wetted material combinations can be selected according to process media conditions.

Bidirectional bubble-tight sealing

This series provides bidirectional bubble-tight sealing and specifies testing in accordance with MSS SP-61, API 598, and EN 12266-1.

Defined temperature and pressure operating ranges

This series has an operating temperature range of -18°C to 200°C, a maximum allowable operating pressure of 10 bar (150 psi), and a size range of NPS 2 to 24 or DN 50 to 600.

Multi-standard flange drilling compatibility

Valve flange drilling is compatible with ASME B16.1 Class 125, ASME B16.5 Class 150, and EN 1092 PN 10, 16 standards.

Installation & maintenance notes

Verify pipe inside diameter and prevent disc interference

Before installation, verify the inside diameter of adjacent piping against the actual valve dimensions. During installation and test operation, ensure that the disc does not contact or scrape against the pipe inner wall or flange bore to prevent damage to the disc, PTFE lining, or seat, and to avoid seal failure.

FAQ

How does a PTFE-lined butterfly valve work?

The 22/23 Series resilient-seated butterfly valve achieves bidirectional bubble-tight shutoff through an interference fit between the disc and seat. The seat geometry reduces wear and torque during opening and closing, ensuring reliable sealing and a long service life in corrosive media applications.

How should materials and temperature range be considered during selection?

Available materials include PTFE, conductive PTFE, and UHMWPE. Select the appropriate material based on process requirements and media corrosivity. The operating temperature range is 0°F to 392°F (-18°C to 200°C). The specific configuration must be confirmed based on the actual model and application conditions.

What are the key technical features of the shutoff design for this series?

The valve uses a bidirectional bubble-tight shutoff design with a seat energizer to provide uniform loading, improve sealing reliability, and reduce opening and closing torque.

What size and connection options are available for this series?

Sizes range from DN50 to DN600 (or NPS 2 to 24). The body is available in wafer or lug styles, with flange drilling that complies with multiple international standards, including ASME and EN, for compatibility with common piping systems.

What are the key installation and maintenance considerations for this valve?

The two-piece wafer/lug body design, polyester body coating, and upper stem bushing facilitate installation, alignment, and actuator connection. Routine maintenance should focus on stem seals, seat wear, and actuator alignment. Refer to actual operating conditions to determine the appropriate maintenance frequency.

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