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2. Pressure switch - Wikipedia

   en.wikipedia.org/wiki/Pressure_switch

   A pressure switch is a form of switch that operates an electrical contact when a certain set fluid pressure has been reached on its input. The switch may be designed to make contact either on pressure rise or on pressure fall. Pressure switches are widely used in industry to automatically supervise and control systems that use pressurized ...

3. Fisher-Porter tube - Wikipedia

   en.wikipedia.org/wiki/Fisher-Porter_tube

   Fisher-Porter tube. A Fisher-Porter tube or Fisher-Porter vessel is a glass pressure vessel used in the chemical laboratory. The reaction vessel consists of a lipped heavy-wall borosilicate glass tube and a lid made from stainless steel. The lid is sealed with an o-ring and held in place with a coupling. The advantage over steel autoclaves is ...

4. Harry Potter: Quidditch Champions - Wikipedia

   en.wikipedia.org/wiki/Harry_Potter:_Quidditch...

   Harry Potter: Quidditch Champions is a sports video game developed by Unbroken Studios and published by Warner Bros. Games under its Portkey Games label. The game focuses on the Harry Potter -related sport Quidditch. The player controls a character that holds a specific position in Quidditch and engages in broomstick adventures and competitive ...

5. Severus Snape - Wikipedia

   en.wikipedia.org/wiki/Severus_Snape

   Severus Snape is a fictional character in the Harry Potter series of novels by J. K. Rowling. In the first five novels, he is the professor of Potions at Hogwarts School of Witchcraft and Wizardry. In the sixth book, he teaches Defence Against the Dark Arts, and in the seventh book he ascends to the position of headmaster before his death.

6. Mercury switch - Wikipedia

   en.wikipedia.org/wiki/Mercury_switch

   A mercury switch is an electrical switch that opens and closes a circuit when a small amount of the liquid metal mercury connects metal electrodes to close the circuit. There are several different basic designs (tilt, displacement, radial, etc.) but they all share the common design strength of non-eroding switch contacts.

7. Pilot-operated relief valve - Wikipedia

   en.wikipedia.org/wiki/Pilot-operated_relief_valve

   PORV are also called pilot-operated safety valve (POSV), pilot-operated pressure relief valve (POPRV), or pilot-operated safety relief valve (POSRV), depending on the manufacturer and the application. Technically POPRV is the most generic term, but PORV is often used generically (as in this article) even though it should refer to valves in ...