SLV
Pneumatic Fluorine-Lined Butterfly Valve with Limit Switch
The SLV Pneumatic Fluorine-Lined Butterfly Valve is a PTFE-lined butterfly valve driven by a pneumatic actuator and fitted with a limit switch. It automates the isolation of highly corrosive media while feeding valve position back to the control room, so operators always know whether the line is open or closed.
Product Benefits
- Fully lined wetted parts: Both the disc and the seat are PTFE, so the metal body never touches the process fluid.
- Handles aggressive chemicals: A standard cast body can therefore carry chemicals that would rapidly attack an unlined valve.
- Cheaper than exotic alloy: The lining does that work at a much lower cost than an exotic-alloy alternative.
- Remote position feedback: The integrated limit switch confirms open and closed positions remotely, which supports interlocks, sequencing and alarm logic in automated plants.
- Actuator options: Double-acting and single-acting versions allow either powered operation in both directions or a spring-return fail-safe action.
Where It's Used
- Corrosive-service shutoff: It is intended for automated shutoff on lines carrying highly corrosive process media.
- Chemical processing: Typical settings are chemical plants and similar aggressive services where operators should not handle valves locally.
- Supervised and interlocked steps: Position feedback makes it a natural fit for remotely supervised or interlocked process steps.
- Standard connections: As with the rest of the family, wafer, lug and flanged connections are available, so it can be installed in most flanged piping arrangements.
Good to Know
- Body is not the barrier: Body materials range from cast iron and carbon steel to stainless steel grades, but with a lined valve the lining does the corrosion work, so body choice is driven mainly by the external environment and mechanical needs.
- Check lining compatibility: What matters most at selection is confirming the PTFE lining's chemical compatibility with the specific medium and operating conditions.
- Protect the lining: PTFE linings are resilient but can be damaged by abrasive solids or careless handling during installation, so protect the sealing faces when the valve is out of the line.
- Verify the switch: The limit switch should be checked during commissioning so that indicated and actual positions agree.
