A41H spring micro opening closed safety valve is suitable for equipment or pipelines with working temperature ≤ 300 ℃ for media such as petroleum gas, air, water, etc. A41Y type is suitable for equipment or pipelines with corrosive media working temperature ≤ 200 ℃, as an overpressure protection device. Suitable for equipment or pipelines with working temperatures ≤ 300 ℃ for media such as petroleum gas, air, water, etc.

1. Spring micro opening safety valves have the characteristics of simple structure, good sealing performance, accurate opening pressure, large discharge capacity, small reseating pressure difference, and easy adjustment.

2. Nozzle type valve seat: The valve seat is a displacement nozzle type valve seat. When steam flows through the outlet of the valve seat, it reaches the speed of sound and has a high emission coefficient. The sealing surface of the valve seat is welded with cobalt chromium tungsten hard alloy, which is wear-resistant and erosion resistant, and has a long service life.

3. Thermoelastic valve disc: The valve disc is designed as a thermoelastic structure, which utilizes its small deformation under medium pressure to improve sealing ability and overcome the forward leakage phenomenon of the safety valve near the set pressure under medium pressure. The sealing surface of the valve disc adopts advanced laser quenching technology, which improves hardness, wear resistance, and impact resistance.

4. Adjusting the nut: By adjusting the adjusting nut and adjusting the compression of the spring, the valve can easily and quickly obtain accurate set pressure.

5. Back pressure adjustment sleeve: an auxiliary mechanism for adjusting the back pressure of the valve disc. By adjusting the back pressure adjustment sleeve, a suitable reseating pressure difference can be obtained. When increasing, reduce the back pressure of the valve. When lowering, increase the back pressure of the valve.