1.the relief valve is an important component of wellhead production. When high pressure enters the drive, the bottom spring will open the valve. through console operation, the spring on the relief valve will automatically push the stem to close the valve, thus ensuring safety on the production.Assembled safety valve with consideration of optimal safety and economic. the available safety valve sizes from 1-13/16" through to 7-1/16",of pressure rating from 2000psi to 20000psi.
2.Hydraulic Surface Safety Valve feature:
A. Visual position indicator
B. Optional fire protection (fusible loop)
C. Separate stems can make them easy disassembling and maintaining.
D. Has a compoud-springs designing to improve its stability.