Dwyer Instruments WE20 | Butterfly valve
The Dwyer WE20 is a 2-way wafer or lug butterfly valve designed for 2" to 12" line sizes, featuring a cartridge seat design with PTFE or EPDM seat options. Rated to 225 psi (15.5 bar), the WE20 is designed for reliable, low-torque operation and fully rated dead-end service.
Part Number: WE20
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Product Overview
The Dwyer Series WE20 Butterfly Valve is a general-purpose 2-way valve available in both wafer and lug body configurations. It uses a cartridge seat design with PTFE or EPDM seat materials, providing an alternative to conventional dove-tail seat designs.
The cartridge seat design keeps the seat dynamics independent of the valve's flange connection. This helps produce smaller and more consistent operating torques, while precision machining of the disc and body maintains a tighter disc-to-seat tolerance.
Each time the valve is cycled, the cartridge design helps produce a precise, low-torque seal. The seat-to-disc sealing arrangement can provide fully rated dead-end service without depending on flange support for proper sealing.
The WE20 is available for 2" to 12" line sizes and supports ANSI Class 125 (B16.1) and ANSI Class 150 (B16.5) lug and wafer flange patterns. Its extended neck provides clearance for insulation without requiring custom additions.
For monitoring and automation applications, manual WE20 valves can be fitted with limit switches for remote position monitoring. The valve is also available with a range of pneumatic and electric actuators for automated operation.
The wetted construction includes a ductile iron body, 316 stainless steel disc, EPDM or PTFE seat, EPDM O-ring and 410 stainless steel stem. A Nylatron bearing supports the valve mechanism.
Key Benefits
- Cartridge seat design avoids typical dove-tail seat installation issues
- Independent seat dynamics provide smaller and more consistent operating torques
- Fully rated dead-end service without relying on flange support
- Pin-free machined flats connect the disc to the stem for reliable operation
- Extended neck accommodates insulation without custom modifications
- Available in wafer and lug body configurations
- PTFE and EPDM seat options for different service conditions
- Compatible with limit switches for remote monitoring
- Supports pneumatic and electric actuator options for automation
- Rated to 225 psi (15.5 bar)
- Free UAE-wide shipping on genuine stock
Who This Product Is Best For
The Dwyer WE20 is suited for:
- HVAC and process piping contractors working with 2" to 12" lines
- Facilities requiring general-purpose butterfly valve isolation
- Applications requiring fully rated dead-end service
- Installations where consistent, low operating torque is important
- Facilities planning future valve position monitoring or automated operation
- Piping systems using ANSI Class 125 or Class 150 flange patterns
How to Specify & Commission It
- Confirm that the required 2" to 12" line size and ANSI flange class match the piping system.
- Select the appropriate PTFE or EPDM seat material based on the process media and operating temperature.
- Select the required wafer or lug body configuration.
- Install the valve between the appropriate flanges and follow the manufacturer's installation and torque requirements.
- Cycle the valve to verify smooth, low-torque operation before commissioning.
- Add a limit switch, pneumatic actuator or electric actuator if remote monitoring or automated control is required.
Frequently Asked Questions
What line sizes does the WE20 cover?
The WE20 is available for 2" to 12" line sizes with ANSI Class 125 (B16.1) and ANSI Class 150 (B16.5) lug and wafer flange patterns.
What makes the WE20 cartridge seat design different?
The cartridge seat design keeps seat dynamics independent of the flange connection, helping provide smaller and more consistent operating torques. It also supports fully rated dead-end service without relying on flange support.
What seat materials are available?
The WE20 is available with EPDM or PTFE seat materials.
What are the temperature limits for the seat options?
The EPDM configuration is rated from -50 to 250°F (-46 to 121°C), while the PTFE configuration is rated from 0 to 300°F (-18 to 149°C).
What is the maximum operating pressure?
The maximum operating pressure is 225 psi (15.5 bar).
Can the WE20 be automated?
Yes. The WE20 is available with a range of pneumatic and electric actuators. Manual versions can also be equipped with limit switches for remote monitoring.
What materials are used in the wetted construction?
The construction includes a ductile iron body, 316 SS disc, EPDM or PTFE seat, EPDM O-ring and 410 SS stem.
Is the WE20 suitable for dead-end service?
Yes. The cartridge seat design can provide fully rated dead-end service without depending on flange support for sealing.
Is genuine stock available with UAE shipping?
Genuine Dwyer stock with free UAE-wide shipping is available. Call +971 6 5436933 for current pricing and availability.
Request a Quote Today
For pricing, availability or technical assistance with the Dwyer WE20 butterfly valve, contact General Tech Services LLC.
Call: +971 6 5436933
Website: www.generaltechshop.ae
