Valves for Heat Pump Water Heating Systems: Features & Applications


mmexport1446082309008 150x150 Valves for Heat Pump Water Heating Systems: Features & Applications

gate valve

There are various of valves in a heat pump water heating system. The features and functions of different valves are not same. So it’s important to know them clearly.

1. Gate Valve

Features: Also known as a sluice valve, is a valve that opens by lifting a round or rectangular gate/wedge out of the path of the fluid. The distinct feature of a gate valve is the sealing surfaces between the gate and seats are planar, so gate valves are often used when a straight-line flow of fluid and minimum restriction is desired.

Applications: Often for pipes of DN>=50mm, and for where the valves do not need to be turned on/off frequently.

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butterfly valve

2. Butterfly valve

Features: A butterfly valve is a valve which can be used for isolating or regulating flow. The closing mechanism takes the form of a disk. Operation is similar to that of a ball valve, which allows for quick shut off. Butterfly valves are generally favored because they are lower in cost to other valve designs as well as being lighter in weight, meaning less support is required.

Applications: Often for pipes of DN>=50mm. Be used for isolating or regulating flow.

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Y-type strainer

3. Y-type strainer

Features: Y-type strainer is designed for remove foreign matter from pipe lines and provides protection for pumps, meters, valves, and other similar mechanical equipment, which is called as Strainer. “Y” Type Strainers are named after their shape and normally used for course filtration. But with large filtration area can be used with fine mesh also. The Strainer improves the clearance in the medium, and prolongs the life of valves; protect expensive pumps, meters and other equipment.

Applications: A Y-strainer can be installed in either a horizontal or vertical position (Downward flow) with the screen element-pointing downward. This allows the strainer screen to collect material in the strainer at the lowest point of the screen. It is suitable for water, Air, Gas, petroleum, steam and other fluids.

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relief valve

4. Relief valve

Features: The relief valve (RV) is a type of valve used to control or limit the pressure in a system or vessel which can build up for a process upset, instrument or equipment failure, or fire.

Applications: The pressure is relieved by allowing the pressurised fluid to flow from an auxiliary passage out of the system. The relief valve is designed or set to open at a predetermined set pressure to protect pressure vessels and other equipment from being subjected to pressures that exceed their design limits.

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pressure regulator

5. Pressure regulator

Features: A pressure regulator is a valve that automatically cuts off the flow of a liquid or gas at a certain pressure.

Applications: Pressure regulators are used to allow high-pressure fluid supply lines or tanks to be reduced to safe and/or usable pressures for various applications.

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6. Check valve

Features: A check valve, clack valve, non-return valve or one-way valve is a valve that normally allows fluid (liquid or gas) to flow through it in only one direction.

Applications: Used as a backflow prevention device.

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7. Ball valve

Features: A ball valve is a form of quarter-turn valve which uses a hollow, perforated and pivoting ball (called a “floating ball”) to control flow through it. It is open when the ball’s hole is in line with the flow and closed when it is pivoted 90-degrees by the valve handle.

Applications: Often for pipes of DN>=50mm. Be used for isolating or regulating flow.

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air release valve

8. Air release valve

Features: The air release valve, also known as air vent valve or air evacuation valve, has a float to sense the presence of air and a linkage mechanism that gives the float mechanical advantage in opening the orifice under full pipeline pressures.

Applications: To evacuate air in water pipes.

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flexible joint

9. Flexible joint

Features: Rubber/elastomer flexible joints (expansion joints) provide efficient but economic ways to accommodate pressure loads, relieve movement stress, reduce noise, isolate vibration, compensate for misalignment after plants go on stream, and prolong life of motive equipment.

Applications: They are installed to accommodate movement in piping runs, protect piping from expansion and contraction.

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sail valve

10. Sail switch

Features: A sail switch, vane switch or flow switch is a mechanical switch that is switched on or off in response to the flow or non-flow of a fluid such as air or water. A sail switch typically operates through the use of a paddle which gets displaced due to the force of fluid moving past it. Sail switches find application in the detection of fluid flow and measurement of fan speeds.

Applications: A sail switch might be used to protect a central heating system electric heating element from being energized before the air flow from the blower is established. Sail switches might also be used to alarm if a ventilation fan in a hazardous location fails and air flow has stopped. For some HVAC systems, a sail switch can activate an electronic air cleaner, a humidifier, or other equipment in response to airflow from the system fan.

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