Size: 2â-16â Pressure Rating: 150-300 LB End: BW, RF Material: Carbon Steel, Stainless Steel, Alloy Steel, Duplex Steel Operation: Manual, Pneumatic, Electric Design & Manufacture Standard: ASME16.34, DIN 3356 Face to Face: ASME B16.10, DIN 3202 End Connection: ASME B16.5, DIN 2543-2545 Test Standard: API598, DIN 3230 Bolted bonnet OS&Y Double seal design(bellows+packing) Multiply bellow with long service life Effective for energy savings