VST Watts 4 BAR 1-1 1/4" Safety Valve 0214140

€134.76

Tax included

Diaphragm valve with fixed calibration at 4 bar, complying with PED Directive 2014/68/EU and certified by INAIL. Reliability and safety for thermal systems.

Calibrated pressure: 4 bar fixed calibration
DN (nominal diameter) 1 1/4 in.
FF (female-female) connections with increased output
INAIL former ISPESL qualification in accordance with the regulations
Brass body and cap CW617N
Operating temperature: -10 to 120 °C
Compatible fluids: water or water/glycol mixture up to 50%.
Complies with PED Directive 2014/68/EU CE0425

Available

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Certified VST Watts safety valve for fluid systems

The 1-1/4 VST Watts valve is designed to provide automatic protection of heat generators and plumbing systems from overpressure. Activation is fully mechanical, without external power supply, making it ideal for systems with high reliability and safety.

The diaphragm sealing element ensures a precise response to operating pressure, protecting the system when the pressure exceeds the preset limit of 4 bar. In addition, the valve is approved according to INAIL regulations and CE certified, making it also suitable for systems subject to technical testing and inspection.

Ideal applications:

Civil and industrial heating systems
Solid or liquid fuel boilers
Closed systems with thermal storage
Hydraulic systems with heat transfer fluid (water/glycol)

Use

VST Series safety valves are generally used in closed-circuit heating systems with a rated output of more than 35kW and using hot water with a temperature below 110°C. The function of the safety valve is to protect the generator and the system from sudden unanticipated pressure increases.

The causes of valve tripping can be of various types:

rise in operating fluid temperature above the preset maximum value resulting in uncompensated expansion;
insufficient sizing of the expansion tank;
excessive filling pressure of the circuit.

Therefore, the safety valve remains inactive when the system operation is normal.

Operation

The fluid contained in the system exerts pressure on the plug; this thrust is counteracted by the spring until the pressure exceeds the stated set value. The plug then slowly begins to open, allowing the influx of water to inflate the diaphragm. The valve opens and discharges to atmosphere, preventing the system pressure from reaching dangerous limits for the generator and system components. The plug completes its full stroke before the fluid pressure is 10 percent above the set pressure value (overpressure). The valve closes before the pressure drops by 20 percent below the set pressure (closing gap). The increased diameter of the outlet port compared to the inlet port gives the valve high discharge capacities. The characteristics of the materials used prevent seizure phenomena over time.