Tested according to API 598 and marked as per MSS SP-25
2) Three bonnet designs
a) Bolted
b) Welded
c) Pressure seal
3) Construction:
a) Full port or reduced port
b) Outside screw and yoke (OS & Y)
c) Two piece self-aligning packing gland
d) Bolted bonnet with spiral wound gasket, threaded and seal welded bonnet
or threaded and pressure seal bonnet
e) Integral backseat f) Loose solid disc
g) Socket weld ends to ASME B16.11
h) Screwed ends (NPT) to ANSI/ASME B1.20.1
4) Material: WCB, SS 316, SS 304 etc
5) Size: 3/8" ~ 2"
6) Thread: NPT, BSPT, BSP, DIN259/2999c
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