Spring full bore external thread type with lever safety valve

FREE-VALVE’s spring full bore external thread type with lever safety valves (A28 type) are used for the equipment and pipeline of the air ,N2,H2 mixed gas vapour etc . Medium that the working temperature are less than 200 °C.Take for extra pressure protection device .

Features

1.Simple structure, good sealing performance, accurate opening pressure, re-seating pressure difference is small, easy adjustment,etc.

2. The seat is a Valenozzle-type , the speed of sound is reached when steam flows through the seat outlet, discharge coefficient is large.The seat sealing surface weld tungsten carbide alloy, wear resistance, long life.

3. For the safety valve with a lever ,it can be opened manually with the lever when the medium’s pressure is up to over 75% of that at which the valve opens.

4.Adjusting the adjustment nut, adjust the spring compression, the valve can be very convenient, very quickly to obtain accurate adjustment pressure.

5.Full bore type safety valve ,the height of the lift is more thanthe 1/4time of flow diameter with large amount of discharge ,the height of opening for a low-lift safety valve 1/20-1/40 time the flow diameter.

Technical Specification

1) Size Range: DN15~DN25

2) Pressure Range: PN10

3) Connection Type:External thread

4) Body material:WCB

5) Pressure test:GB/T12243

6)Design standard: GB/T12241,GB/T12243

7) Service temperature:-20°C to 200°C

Application

FREE-VALVE’s spring full bore external thread type with lever safety valves

are used for steam boiler system ,such as high pressure supply watering heating and heater exchange.