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2. Plug valve - Wikipedia

   en.wikipedia.org/wiki/Plug_valve

   The plugs in plug valves have one or more hollow passageways going sideways through the plug, so that fluid can flow through the plug when the valve is open. Plug valves are simple and often economical. When the plug is conically tapered, the stem/handle is typically attached to the larger diameter end of the plug. Plug valves usually do not ...

3. Stopcock - Wikipedia

   en.wikipedia.org/wiki/Stopcock

   The stopcock is held together with the female joint with a metal spring, plastic plug retainer, a washer and nut system, or in some cases vacuum. Stopcocks plugs are generally made out of ground glass or an inert plastic like PTFE. The ground glass stopcocks are greased to create an airtight seal and prevent the glass from fusing.

4. Fusible plug - Wikipedia

   en.wikipedia.org/wiki/Fusible_plug

   A fusible plug operates as a safety valve when dangerous temperatures, rather than dangerous pressures, are reached in a closed vessel. In steam boilers the fusible plug is screwed into the crown sheet (the top plate) of the firebox, typically extending about 1 in (25 mm) into the water space above it. Its purpose is to act as a last-resort ...

5. Piping and plumbing fitting - Wikipedia

   en.wikipedia.org/wiki/Piping_and_plumbing_fitting

   Non-return or check valves allow the free flow of a fluid in one direction but prevent its flow in a reverse direction. They are often seen in drainage or sewage systems but may also be used in pressurized systems. Valves are available in several types, based on design and purpose: Gate, plug, or ball valves – Isolation; Globe valve ...

6. List of valves - Wikipedia

   en.wikipedia.org/wiki/List_of_valves

   Foot valve: a check valve on the foot of a suction line to prevent backflow; Four-way valve: was used to control the flow of steam to the cylinder of early double-acting steam engines; Freeze seal or Freeze plug: in which freezing and melting the fluid creates and removes a plug of frozen material acting as the valve

7. Valve - Wikipedia

   en.wikipedia.org/wiki/Valve

   Plastic pipework – Tubular section or hollow cylinder made of plastic; Poppet valve – Type of valve; Rotary valve – Valve where rotation of passages in a plug controls flow direction; Tap (valve) – Valve controlling the release of a liquid or gas; Tubing – fluid conveyance