道达尔勘探开发 标准规范 GS_EP_SPS_004_EN.pdf,Exploration Production GENERAL SPECIFICATION SUBSEA SYSTEMS GS EP SPS 004 Subsea Manifold System Gate Valves 07 01/2011 General revision 06 10/2009 General revision 05 10/2008 General revision 04 10/2007 Gener
The actuator shall be either double acting hydraulic operated with “fail as is mode” or single acting with spring return “fail safe close” mode. The required mode is defined in GS EP SPS 002. 2. The actuator piston seals shall be of bi-directional design. 3. The actuator type is ...