1) Standards: 
a) Design & Manufacture: BS 5155,API 609,MSS SP-67,MSS SP-68 
b) Face to Face Dimension: BS 5155,API 609,MSS SP-67,MSS SP-68 
c) End Connection: ASME B16.5,    DIN2543-2545
d) Test and Inspection: ISO5208,BS 6755 
2) Sizes: 2" - 48" or DN50 - DN1200
3) Pressure Rating: Class150 - Class900 or PN16 - PN160
4) Material: WCB, LCB, WC6, WC9, C12, C5, CF8, CF3, CF8M, CF3M, etc. 
5) Operated by: Lever, Gear, Pneumatic, hydraulic and Electric actuator