There are three basic sizes defined by the throat diameter and these are available with a variety of inlet and outlet connections the valves are designed and factory set to lift repeatedly within +/- 2% of the set pressure, and to re-seat above 92% of set pressure. Spring pre-compression and blow-down ring settings are lead sealed after test to inhibit unauthorised tampering, as these products are a category four-safety product. During testing pre-delivery, flow rates at 10% above set pressure are measured to ensure compliance with stated flow capacities.
The valves can be supplied with appropriate positioned drain holes to help prevent freezing caused by water ingress, though ideally the piping should be arranged to prevent this. Complete vessel protection assemblies can be supplied comprising of two relief valves, divertor valve, bursting discs and interconnecting pipe-work
Each valve is individually calibrated and stamped with the date of manufacture, and has it’s own unique serial number prior to dispatch.
提升止回阀尺寸包括DN6, DN10, DN15,DN20, DN25, DN40, DN50, DN 65, DN80,DN100 和 DN150；
可用于 O2, N2, Ar, CO2, He, Kr, Ne, H2,C2H4, N2O。
ISO 9001认证－设计和生产符合ASTM B31.3和BSEN 1626；
bestobell安全阀所有选材可以另行选择BSEN 10204 3.1 / 3.2材质来源证书；
阀体 ASTM A351 CF8M
阀帽 ASTM A276 316
阀盘 BSEN 12164 CW 721R
阀帽垫圈 SIGMA 511
阀帽法兰 ASTM A351 CF8M
紧固件 BS6105 A4 GR.80