What is an Auto Air Vent Valve?

Auto Air Vent Valve is designed for use on heating systems.

How does an Auto Air Vent Valve work?

Auto Air vent valve is a device for bleeding air from the pipeline system. It is based on the principle of a float. The float floats, pressing the needle or plug against the outlet. The air from the heating or water supply system rises up, the float drops, opening the outlet. As soon as the air was out, the float floated up again and blocked the exit. From this, these products are called automatic air vents or air valves. True, there are also air valves in the sewer system, but they perform a different function there.

Applications of Auto Air Vent Valves

Auto Air Vent Valves are used for hot or cold water distribution systems and models with a manual vent feature for fast venting of residential and commercial systems.

Features of Auto Air Vent Valves:

• Body in nickel-plated brass.
• Float in polyethilenic resin.
• Maximum working temperature: 110°C.
• Maximum discharge pressure: 6 bar.
• Threads: ISO 228 (equivalent to DIN EN ISO 228 and BS EN ISO 228).
• Available with NPT thread in the sizes 1/2″ – 3/4″ – 1″

Material of Auto Air Vent Valves:

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What is an Automatic Air Vent Valve?

Automatic Air Vent Valve is designed for use on heating systems.

How does an Automatic Air Vent Valve work?

Automatic Air Vent Valve is installed on the heating system, typically within cylinder cupboards, to automatically bleed air from the heating system. The device consists of a polypropylene float connected to a simple valve. When the build-up of air within the float chamber exceeds a certain level the float drops, opening the valve and releasing the air trapped within the chamber. As the air is released, water replaces it, and moves the float back into the up position, which closes the valve.

What are Automatic Air Vent Valves used for?

When air becomes trapped in a sealed heating system it can cause a wide variety of problems including excessive noise, corrosion and increased maintenance costs related to air locks that can prevent the system from operating effectively and efficiently. The Automatic Air Vent is installed on the heating system, typically within cylinder cupboards, to automatically bleed air from the heating system.

Applications of Automatic Air Vent Valves

Automatic air vent valves are most suited for heating systems and other closed circuit hot water systems which require an efficient and automatic removal of air whilst the system fills with water. A vacuum break is fitted onto the bottom of the valve in order to prevent an air lock forming and encourages air to be released from the water within the system.

Features of Automatic Air Vent Valves:

• Automatically vents trapped air from within sealed heating systems
• Robust solid brass construction and heat resistant polypropylene float
• Available with a variety of connection ends

Material of Automatic Air Vent Valves:

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What is an Air Vent Valve?

An air vent valve is a safety device that discharges air at the water supply piping in order to avoid air related problems in the water piping systems.

How does an Air Vent Valve work?

When liquid is pumped through the system at startup, the initial air inside the piping is pushed into the air vent by the pressure of the flow. The float remains in the lower part of the air vent, allowing the valve to remain open and continuously discharge air.

After the initial air venting, liquid flows into the air vent. The float rises with the rising liquid and closes the valve.

If air enters the air vent while it is closed, the liquid level drops and the float lowers, allowing the valve to open and discharge air once more.

What are Air Vent Valves used for?

• For protecting piping materials and systems from corrosion due to air (oxygen).
• For preventing water splashing at faucet due to the existence of air.
• For preventing noise resulted from the ingress of air into cold/hot water supply systems, air conditioning systems, and other systems.
• For the smooth startup and stable operation of water supply and other systems/devices through air discharge at the time of initial water conveyance.

Applications of Air Vent Valve

• Cold and hot water supply system
• Hot water boiler
• Solar hot water system
• Other various devices
• Air conditioning system
• Hot water heater appliance
• Pressure tank

Features of Air Vent Valves:

• High Quality: The exhaust mechanism is very reliable and is cast from high-precision components
• Good Feature: This valve features high temperature resistance, rust protection, reliably sealing.
• Exquisite Design: The steam and water separation tray is designed with special structure to ensure that the water will not be discharged during exhaust. As long as the system has pressure, the exhaust valve will continue to vent.
• Convenient: It is convenient to demount and maintenance, while the water in the system will not flow out, so there is no need to empty the system.
• The steam and water separation tray is designed with special structure to ensure that the water will not be discharged during exhaust.

Material of Air Vent Valves:

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Double Orifice Air Release Valve

Festures of Double Orifice Air Release Valve

• Body is provided with a shock-proof inner tube to protect the float；
• Lower water pressure can be closed to prevent drainage；
• When there is negative pressure, the piston quickly opens to breathe；
• Stainless steel floating ball, long life.

Double Orifice Air Release Valve Working Principle

This valve exhaust, buoy, by gravity pull down one end of the lever, the lever in the tilt state at this moment, in the leverage and vent contact appeared gap, air through the vent through the gap, with the air discharge, water level rise, buoy under the effect of the buoyancy of water float upwards, the lever on the seal face pressure on the porosity, gradually until the vent is completely blocked. The exhaust valve is now completely closed.

Double Orifice Air Release Valve Installation and Commissioning

When installing the double orifice air release valve, always install a protective valve on the front end to avoid stopping water from being tested. For specific use, please consult ZECO Valve Group.

Double Orifice Air Release Valve Material and Standard

Size Range: 2″~12″

Pressure Rating: 10bar ~ 25bar

Face to Face Dimensions: AMSE B16.10, EN558-1

Flange End Dimension: AMSE B16.1/16.42, AS4087, EN1092-2

Coating: Fusion Bonded Epoxy Coating

Inspection and Test: ISO 5208 / EN 12226-2

Part	Material	Standard
Body	Ductile Iron	EN 1563/DIN 1693
Bonnet	Ductile Iron	EN 1563/DIN 1693
Exhaust Hood	Ductile Iron	EN 1563/DIN 1693
Float Ball	Stainless Steel 431	EN10088-1/ASTM A959
Strainer	Stainless Steel 431	EN10088-1/ASTM A959
Tank	EPDM / NBR	ISO 4633
For the materials options not listed, consult factory. ZECO manufactures valves in more than 50 different alloys.

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Combination Air Valve

Festures of Combination Air Valve

  

• Suction at negative pressure；
• Fast exhaust；
• Exhaust only does not drain；
• Slight exhaust and large.

Combination Air Valve Working Principle

When tube began to water injection, the disc in the open position, a large number of exhaust, when the air line up, the full of water in the valve, floating ball up and drive the valve closed, stop the exhaust, when water tube is normal transportation, if there is a small amount of air within the valve to a degree, water levels fall in the valve, floating ball drops, the air is being exhausted from the holes. When the pump stops, the water flow in the pipe is empty or negative pressure is generated in the pipe. At this time, the plug is opened quickly and the air is inhaled to ensure the safety of the pipe.

Combination Air Valve Installation and Commissioning

This valve is usually installed at the highest point of the system, such as tightening the bonnet on the valve body, the air valve stops the exhaust, normally, the bonnet should be open. Air valve can also be used with the block valve, convenient exhaust valve maintenance. For specific use, please consult ZECO Valve Group.

Combination Air Valve Material and Standard

Size Range: 2″~8″

Pressure Rating: 10bar ~ 25bar

Face to Face Dimensions: AMSE B16.10, EN558-1

Flange End Dimension: AMSE B16.1/16.42, AS4087, EN1092-2

Coating: Fusion Bonded Epoxy Coating

Inspection and Test: ISO 5208 / EN 12226-2

Part	Material	Standard
Body	Ductile Iron	EN 1563/DIN 1693
Bonnet	Ductile Iron	EN 1563/DIN 1693
Exhaust Hood	Ductile Iron	EN 1563/DIN 1693
Float Ball	Stainless Steel 431	EN10088-1/ASTM A959
Strainer	Stainless Steel 431	EN10088-1/ASTM A959
Seal	EPDM / NBR	ISO 4633
For the materials options not listed, consult factory. ZECO manufactures valves in more than 50 different alloys.

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What Causes Air in Water Pipes?

Air and vacuum formed in water mains may lead to serious operating problems and even some dramatic consequences. Air can enter piping systems in several ways:

• • Empty Pipelines
    • • Pipelines not in operation are occupied with air. Most of it is evacuated during startup, but some air pockets can remain in the system.

• • Air in The Fluid
    • • Depending on the temperature and pressure, liquids like water can contain trapped or dissolved air. During fluid flow, it separates from the liquid and can become trapped at the system’s high points. Also, in pipelines conveying sewage, the liquid waste can undergo chemical reactions and evolve into gases that can get trapped in the wastewater system.

• • Mechanical Equipment
    • • Air can also get into the pipeline through mechanical systems like pumps, pipe joints, valves, etc. Leaks or faulty seals in these components can lead to air infiltrating the piping system

How does a Vacuum Form in a Pipe?

Vacuums in pipelines occur when the pressure in the pipeline drops below the atmospheric pressure. Vacuums can appear due to sudden changes in the velocity of the flowing fluid. For example:

• • When the pumps are switched off too fast

• • When the valves are suddenly closed

• • Emptying line sections of the pipeline in a wrong way

What is a Single Orifice Air Release Valve?

A Single Orifice Air Valve sometimes referred to as a “small orifice” valve, will continuously release accumulated air during system operation. As air from the pipeline enters the valve, it displaces the water, allowing the float to drop. The air is then released into the atmosphere through a small orifice. As the air is vented it is replaced. An added benefit of an Air/Vacuum Valve is its ability to provide pipeline vacuum protection. If a negative pressure develops, the air release valve will open, admitting air into the line, and reducing the potential for surges related to column separation and possible pipeline collapse.

Main Components of Single Orifice Air Release Valves

• • Valve body
    • • The unique ductile Iron valve body is compact and houses the inner floats and upper mechanism. The body is designed so that the inlet is completely free of float guides, therefore enabling butterfly valves to be used directly under the air valve without impacting performance. Each valve body has a lower 316SS grade tamper-proof drain valve enabling the valve to be drained and tested quickly and safely.

• • Inner float assemblies
    • • The inner floats are all manufactured from bar-stock polypropylene which ensures they cannot ever change their mass or shape. The floats are all guided and kept square to the body by the four guide ribs on the valve body ensuring they cannot get blown offset to the side.

Three Floats Assist in Producing the Three-General Functions

• • Large orifice float
    • • This enables air inflow and discharges during filling and drainage.

• • Small orifice float
    • • The small orifice float houses the nozzle subset, ensuring that the valve automatically releases any entrapped air when the pipe is full, and an air pocket presents itself into the valve.

• • RFP upper float
    • • During pipe filling, this float will remain open to fill the pipe at a controlled rate. If the exit flow rate exceeds a safe working rate, it immediately rises and chokes the air discharge to a safe operating rate, avoiding the water hammer.

• • Upper seat
    • • The 316S grade stainless steel seat cleverly houses the O rings that make the seal between the seat float.

• • Mesh outlet and cover
    • • The valve has a stainless-steel mesh that prevents any possibility of external contaminates fowling the inner floats and keeps vermin and spiders away from the underside of the cover. The ductile cover is robust and keeps any direct sunlight away from the floats and is strong enough to be stood on if fitted inside a valve pit.

Features of Single Orifice Air Release Valve

While Air/Vacuum Valves will exhaust large quantities of air upon start-up, it should be remembered that they will not continuously release air during system operation. For this function, a single orifice air valve is also required.

The function of a Single orifice air valve is to allow air to be expelled from the system during filling and to admit air into the system whenever sub-atmospheric pressure occurs. When water enters the valve body the float buoyancy lifts it onto the seat and the resultant rise in system pressure ensures a tight seal, with line pressure holding the float on the seat. In the event of air entering the valve while the line is still positively charged, the valve remains shut. In the event of sub-atmospheric pressure in the system, water is drawn from the body and the float drops from the seat to admit air into the system.

Single Orifice Air Release Valve Working Principle

Automatic air release valves are installed at the highest points in a pipeline where air naturally collects. Air bubbles enter the valve and displace the liquid inside, lowering the liquid level. When the level drops to where it no longer buoys the float, the float drops. This motion pulls the seat away from the orifice, triggering the valve to open and vent the accumulated air into the atmosphere.

As the air is vented, liquid re-enters the valve, once again buoying the float, lifting it until the seat presses against the orifice, closing the valve. This cycle automatically repeats as often as necessary to maintain an air-free system.

Proper installation is critical to the operation of air release valves. Because these valves are designed to release air from the piping system, they should be placed where the air is most likely to collect. Install them at system high points in the vertical position with the inlet down. Remember to add a shut-off valve below the valve in the event servicing is required.

Single Orifice Air Release Valve Installation and Commissioning

Choosing the right location for the installation of an air valve is very important. To obtain maximum efficiency, the air valves are placed at strategic locations on the pipeline’s run. For proper aeration and ventilation of water and wastewater systems, air valves are required at the following points:

• • Maximum High Points
    • • Air bubbles accumulate and form air pockets that get stuck at the highest points in the system. Placing air valves here helps ventilate the air pockets out to the atmosphere. Valve Required: Air release valve/combination valve.

• • Temporary High Points
    • • Local high points can also serve as an accumulation spot for air bubbles. An air valve here vents the bubbles out to the atmosphere. Valve Required: Air release valve/combination valve.

• • Long Rising or Falling Pipe Sections
    • • Dislodged air pockets can flow downstream and form larger air pockets at the top section of the pipe. Also, rapid flow in downward sloping pipe sections can form a vacuum. As a rule of thumb, air release valves and air vacuum valves should be installed every 800m on long pipe runs to properly vent and draw air into the system.

• • Long Rising or Falling Pipe Sections
    • • Dislodged air pockets can flow downstream and form larger air pockets at the top section of the pipe. Also, rapid flow in downward sloping pipe sections can form a vacuum. As a rule of thumb, air release valves and air vacuum valves should be installed every 800m on long pipe runs to properly vent and draw air into the system.

• • After Fast Closing Valves
    • • When valves are suddenly shut off, vacuums can form downstream from the valve due to the momentum of the flow. For the proper functioning of the pipe, the negative pressure needs to be relieved by admitting air into the pipe.

• • After Flow Throttling / Boosting Devices
    • • After flow throttling devices like turbines or control valves, the pressure and velocity differences can lead to the formation of a vacuum. Air vacuum valves are needed close to these devices to draw air into the system Flow boosting devices like pumps and reduced pipe sections also draw air bubbles into the flow. Air release valves need to be installed after these devices to vent these air pockets.

Finally, always install your air valves at accessible, well-ventilated locations. This ensures they always have enough air to draw into the systems, and the air expelled has a route out. Also, it makes it easier to reach the valves for maintenance.

Single Orifice Air Release Valve Material and Standard

• • Size Range: 3/4″~2″

• • Pressure Rating: 10bar ~ 25bar

• • Face to Face Dimensions: EN 558-1, ASME B 16.10

• • Flange End Dimension: BS 21

• • Coating: Fusion Bonded Epoxy Coating

• • Inspection and Test: ISO 5208 / EN 12226-2

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Wastewater Air Release Valve

Festures of Wastewater Air Release Valve

This valve principle is the same as the clean water air release valve, but the structure is slightly changed, valve body lengthened, the lever structure slightly changed. This will reduce the control part, so that the dirt only in the lower part of the body, will not wind the upper exhaust part of the structure, will not affect the exhaust, will not leak water.

Wastewater Air Release Valve Working Principle

• Dirt can only be on the lower part of the body without winding the upper vent；
• Can remove the gas in the pipe, reduce the resistance and save energy；
• When the tube is under negative pressure, it can inhale quickly and automatically；
• Float ball is stainless steel, long service life, safe and reliable.

Wastewater Air Release Valve Installation and Commissioning

If the discharge valve is not installed, the pipe will be blocked at any time, resulting in the outlet water capacity of the pipe is not up to the design requirements. For specific use, please consult ZECO Valve Group.

Wastewater Air Release Valve Material and Standard

Size Range: 2″~10″

Pressure Rating: 10bar ~ 25bar

Face to Face Dimensions: AMSE B16.10, EN558-1

Flange End Dimension: AMSE B16.1/16.42, AS4087, EN1092-2

Coating: Fusion Bonded Epoxy Coating

Inspection and Test: ISO 5208 / EN 12226-2

 

art	Material	Standard
Body	Ductile Iron	EN 1563/DIN 1693
Bonnet	Ductile Iron	EN 1563/DIN 1693
Exhaust Hood	Ductile Iron	EN 1563/DIN 1693
Float Ball	Stainless Steel 431	EN10088-1/ASTM A959
Strainer	Stainless Steel 431	EN10088-1/ASTM A959
Seal	EPDM / NBR	ISO 4633
For the materials options not listed, consult factory. ZECO manufactures valves in more than 50 different alloys.

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