Different types of valves -Ship equipment/Shipping machine
Retention valve, non-return valve, check valve
1) when the disc is not attached to the spindle, the globe valve is considered to be a screw-down nonreturn valve (SDNR).
3 gland flange
5A disc (stop type),
5B disc (piston SDNR),
6 disc stem nut,
7A stem (stop type),
7B stem (piston SDNR),
8 bonnet gasket,
9 gland packing,
10 bonnet studs,
11 bonnet stud nuts,
12 yoke bush,
14 handwheel nut, tack weld, stellite,
2) without a stem to screw down the flow interrupting component, the non-return valve is of the freelifting type.
Note : the flow-interrupting component may be a disc (see figure) or may be a bail (ball check valve),
flap check valve, flap valve, swing check valve,
plug valve, ball plug valve, ball valve,cylindrical plug valve,
cock, bib, bib-cock, faucet, tap,
3 guides cast integral with body,
sleeve-packed cylindrical plug cock
valve classification according to…
full way valve, full bore valve (e.g. gate valve, butterfly valve)
throttle valve (e.g. globe valve, needle valve, piston valve)
straight-through valve, in-line valve, angle valve
flow diversion valve,
relief valve, safety valve, sea suction valve etc.
in the gate valve,
closing by interposing a flat or tapered element (gate or wedge) transversely across the axis of the opening.
in the globe valve,
closing by pressing a disc or plug axially against the opening.