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.

bestobell安全阀技术数据
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；  

bestobell安全阀材料

阀体                  ASTM A351 CF8M

阀帽                  ASTM A276 316

阀盘                  BSEN 12164 CW 721R

密封圈              聚四氟乙烯

阀帽垫圈           SIGMA 511

阀帽法兰           ASTM A351 CF8M

紧固件              BS6105 A4 GR.80

阀门选择数据

通过以下两步来确定提升止回阀的零件编号：

1.  首先从后面的产品规格表中选择零件代码，“CGT--+”

2.  再从下面的表格选择端口连接代码。

例子：25mm的提升止回阀，BW SCH.10连接，完整的零件编号＝CGT50B1B0C。