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2. List of valves - Wikipedia

   en.wikipedia.org/wiki/List_of_valves

   Valves can be categorized into the following types, based on their operating mechanism: Ball valve, for on–off control without pressure drop. Ideal for quick shut-off, since a 90° turn completely shuts off, compared to multiple 360° turns for other manual valves; Butterfly valve, for on–off flow control in large diameter pipes

3. Thermal expansion valve - Wikipedia

   en.wikipedia.org/wiki/Thermal_expansion_valve

   A thermal expansion valve or thermostatic expansion valve (often abbreviated as TEV, TXV, or TX valve) is a component in vapor-compression refrigeration and air conditioning systems that controls the amount of refrigerant released into the evaporator and is intended to regulate the superheat of the refrigerant that flows out of the evaporator ...

4. Isolation valve - Wikipedia

   en.wikipedia.org/wiki/Isolation_valve

   Isolation valves must effectively stop the passage of fluids. [4] Gate valves, ball valves and plug valves are generally considered to provide tight and effective shut-off. Globe valves and Butterfly valves may not be tight shut-off due to wear on the plug or the seat, or due to their design, and may not be appropriate to provide effective ...

5. What's The Difference Between A Heat Pump And A Furnace ...

   www.aol.com/whats-difference-between-heat-pump...

   Ben Baca is an HVAC expert and ... shut-off valves and pressure regulators to prevent explosions, while electric heat pumps have safety features such as automatic shut-off switches and refrigerant ...

6. Home inspection checklist for buyers: What to know - AOL

   www.aol.com/finance/home-inspection-checklist...

   Shut-off valves Built-in appliances. Visible plumbing under sink Any and all fixtures Tub ... HVAC (heating, ventilation and air conditioning), including thermostats, vents, distribution systems ...

7. Rotolock valve - Wikipedia

   en.wikipedia.org/wiki/Rotolock_valve

   Specialized versions are made for specific purposes, such as the Rotolock valve (a stem-type valve also called a Rotalock valve [3]), which is a special refrigeration valve with a teflon ring seated against a machined surface enclosed by a threaded fitting; this valve allows the technician to remove all refrigerant from the compressor without ...