Watts VST Series Diaphragm Safety Valve
INAIL approved, fixed calibration, for closed circuit systems
Ideal for boilers above 35 kW – increased exhaust
Description
The Watts VST safety valve is designed to protect closed-circuit heat generators and heating systems with a power output greater than 35 kW from dangerous overpressure. Made of CW617N brass, with EPDM gaskets and a shock-resistant technopolymer handle, it is suitable for systems with water or glycol mixtures up to 50%.
The valve activates automatically, without the need for external energy, when the pressure exceeds the set value, allowing for controlled fluid discharge. It features a certified fixed calibration and INAIL approval, compliant with PED Directive 2014/68/EU (safety accessory – Category IV).
Each valve is supplied with an individual calibration report and features the serial number stamped on the knob, for maximum traceability and reliability.
Datasheet
• VST Series
• Diaphragm safety valve with fixed setting
• Closed circuit heating systems ≥ 35 kW
• Body and cap: CW617N brass
• Membrane and gaskets: EPDM
• Spring: Zinc-plated C100 steel
• Shutter: CW617N brass
• Knob: Shockproof technopolymer
• Nominal pressure: PN10
• Permissible overpressure: +10%
• Closing waste: < 20%
• Temperature range: -10 ÷ 120 °C
• Connections: FF with increased output
• INAIL approval – Collection R Cap. R.2.A
• CE PED 2014/68/UE – Category IV (CE0425)
Properties
