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Pneumatic Solenoid Valves
5/3-way (center closed) pneumatic solenoid valve with G1/4 inch ports (female thread), G 1/8 inch exhaust ports and 220 V AC coil. Indirect operated (internally piloted).

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Pneumatic Hand Valve
For applications requiring two simultaneous actions, choose a 5/3-way with a pressure center valve. An example is extending two cylinders at once so that material can be secured between them.

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Pneumatic Air Control Valve
Choose a 3/2-way valve for a single acting cylinder with a spring return, which requires a single action to extend. After the spring retracts the valve rod, the valve returns to its normal,

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Pneumatic Mechanical Valve
Choose a 3/2way valve for a single acting cylinder with a spring return, which requires a single action to extend.

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Pneumatic 2w Valves
The valve is suitable for pressures of 0 - 0.7MPA and a maximum temperature of 80° C . For simple applications it is often enough to select a valve based on the thread size and orifice diameter.

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Pneumatic Foot Valve
Use a 5/2-way valve in applications that move continuously between two positions, such as extending and retracting double-acting cylinders, where it is not necessary to stop air pressure.

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What is Pneumatic Valves

Pneumatics is the technology that makes use of gas or pressurized air. A pneumatic system utilizes a compressor to reduce the air volume to increase its pressure. The air (or gas) is filtered and passed through pneumatic hoses, pipes, or tubes. During this transit, the air is controlled by valves, after which it reaches an actuator like a cylinder or a device that performs a function, for example, moving, lifting, or gripping.

Advantages of Pneumatic Valves

Easy maintenance
Also known as air operated valves and air piloted pneumatic valves, these devices have fewer moving parts than their solenoid and manual counterparts. The simple, robust design requires less maintenance, allowing efficiency without constant upkeep. These valves have a high shifting force and tight seal, aren’t easily damaged and don’t require frequent replacement.

Cost effective
Air operated valves are smaller and more efficient than solenoid and manually operated valves. They use less compressed air and the durable design demands fewer upgrades and repairs. They provide long-term cost savings, especially because they don’t need excess maintenance. Air piloted valves last several years when properly maintained, so you won’t have to purchase replacements frequently.

Safety
These valves can handle volatile environments where electricity could result in combustion. They can be employed in operations that aren’t safe for manual valves and mounted in remote locations.

Versatility in applications
Air piloted valves can be easily integrated into automated systems. They’re available in 2-, 3- and 4-way normally opened or closed designs, making them suitable for on-off functions, pressure regulation and directional control. They function as slave and lockout valves to complete simultaneous and interlocking functions.

Reliable in harsh conditions
Air operated valves are designed for hazardous, wet and dirty applications. For example, an air piloted valve would work well in an application where you must transition from contaminated to clean air.

Classification of Pneumatic Valves

Pneumatic pressure relief valves: Pressure relief valves keep the system pressure below a preset maximum value.

Pneumatic flow control valves: Flow control valves are used in pneumatic systems to govern the rate at which a media (liquid or gas) is allowed to flow. Flow control valves can typically be unidirectional or bidirectional.

Pneumatic directional control valves: Directional control valves like solenoid valves are used to start, stop, or direct airflow in a pneumatic system. By directing the flow of air, these valves control the action of other pneumatic devices like motors, cylinders, pumps, or other valves.

Know Pneumatic Valves Process Media

Pneumatic valves have two distinct contexts of use in general:
• A pneumatic valve is a device used to control the flow of air or other gasses in a pneumatic system. The valve can be actuated manually, electrically through a solenoid, motorized, or pneumatically. In this case, the media being controlled is air or gas, and hence the materials chosen for the valve body and seal should be compliant with these media. Possible options include aluminum, stainless steel, brass, and industrial-grade plastics.

• Air can be used as a control mechanism for the valve, but in this case, the media flowing through the valve may be something other than air like oil, water, or other fluids. Here it is necessary to check how compliant the valve housing material is with respect to the various media. Read our article on the chemical resistance of materials to check the compatibility of various housing and seal materials with the media and environment used.

1. Driving pneumatic media or gas
The pneumatic media or gas (like an inert gas or CDA air) used in an automation control process is high conditioned, dried, and filtered. Therefore the valve design need not consider the aggressive media nature or account for the high purity level of the media. Industrial grade plastics (like PVC) can be used for these highly conditioned media.

2. Process fluids
Pneumatic valves for process fluids deal with highly acidic, corrosive, alkaline, or high purity media. Therefore, it is mandatory to select the construction materials suitable for protecting the media and the valve. Stainless steel is a great option for the valve housing material for aggressive and corrosive media. For neutral and non-corrosive media, brass is commonly used as the housing material.

Pneumatic Valves Housing Materials

Always select the housing material suitable for the medium and the working environment. The housings of pneumatic valves for automation control are typically manufactured with a mix of different materials discussed below:
Industrial grade plastics (like PVC and nylon)
Plastic valves are lightweight, durable, and cost-effective. The material is suitable for pneumatic applications involving air and corrosive chemicals. But plastic valves have a low pressure and temperature rating compared to brass and stainless steel valves.

Brass
Brass is an alloy of copper and zinc, and it is an excellent forgeable and robust material. Brass is used in pneumatic applications involving non-corrosive gases. The material can withstand more heat compared to PVC but comes at a higher price. Brass can be easily welded, and it is more versatile when compared to stainless steel. Brass is commonly used to construct pneumatic valve bodies and end pieces.

Stainless steel (304/316)
Stainless steel is a very durable and resilient material, but it is more expensive than brass. Valves made out of stainless steel effectively resist leaks, and these valves can be operated at very high temperatures when compared to brass. Stainless steel is corrosion-resistant and lasts much longer compared to brass, and it is an ideal choice for high temperature and high-pressure pneumatic applications. Stainless steel is commonly used in the pneumatic valve bodies and trim materials like seats, discs, and wedges.

Aluminum
Aluminum is a lightweight metal that has approximately one-third the weight of steel. Aluminum is corrosion-resistant to atmospheric gases and hence suitable for pneumatic valve applications. The material is mainly used to construct the exterior components of the pneumatic valve, like the identification tags or handwheels.

Pneumatic Valves Seal Materials

Seals in pneumatic valves help prevent the escape of volatile and hazardous gasses into the atmosphere. The various types of seal materials used in pneumatic valves are the following:
NBR (Nitrile-butadiene rubber)
NBR has good resistance to compression and general wear and tear but is highly sensitive to weather changes. NBR is suitable for air and inert gasses but has poor resistance to ozone, ammonia, and steam. NBR seals can provide continuous sealing for gaseous media only at low temperatures compared to the sealing properties of FKM.

FKM (Viton)
FKM is typically used to manufacture O rings, gaskets, and seals for pneumatic valves. FKM seals have excellent resistance to the media, aging, and ozone. FKM is suitable for medium-high temperature pneumatic applications and has higher thermal resistance than PTFE. Also, FKM has superior strength, sealing capabilities, and flexibility when compared to PTFE. The material has excellent overall chemical resistance making it suitable for gaseous fuels, and the material shows more chemical resistance universally compared to NBR.

PTFE (Teflon)
PTFE is suitable for high temperature and pressure pneumatic applications. The material is non-elastic and has good resistance to wear and tear abrasion and most chemicals. PTFE offers superior resistance to gaseous chemicals as compared to FKM.

Pneumatic Valve Specifications

Knowing the valve materials is only one part of selecting a pneumatic valve. Some other factors to consider are discussed below.”

01/

Operating medium: The media types that the pneumatic valve can effectively control (compressed air in most cases).

02/

Flow capacity (Cv): Cv gives a measure of the valve capacity to move air through it.

03/

Operating pressure: The range of pressure (in Pa, bars, or psi) that the valve is rated to handle.

04/

Port size: The physical dimensional parameters that define the port sizes on the valve and the thread style.

05/

Rated voltage of coil: For electrically actuated valves, the required voltage rating may be given in AC or DC volts.

06/

Response time: The amount of time required for the valve to switch states or positions once actuated.

Materials for specific pneumatic valves

Directional control valves
Directional control valves are used in pneumatic systems to stop or direct the flow of compressed air or oil to their connected appliances. However, it is not recommended to use these valves for media other than air for most applications. Many pneumatic solenoid valves are piloted internally, and these valves vent a minimal amount of air required to actuate the valve. A small loss of air into the surroundings is acceptable in most applications but not in the case of oil, water, or other types of media. A few examples of materials for these valves that are compatible with the media and environment are:
• Valve body: Aluminium, Plastic, Brass, Stainless steel
• Seal: NBR, FKM, EPDM

Flow control valves
Pneumatic flow control valves are used to control the flow of media like a liquid or gas. These valves consist of a pneumatic actuator part and the valve part like a ball valve or butterfly valve. The actuator is mounted to the valve using a standard flange, allowing both the actuator and the valve portions to be swapped out with another one using the same flange size. Always choose the valve housing and seal materials to be compatible with the media used. A few options are:
• Valve body: Cast iron, Stainless steel
• Seal: EPDM

Pressure control valves
Pressure control valves reduce the pressure of incoming air to a set value at the output port. Brass is a viable choice for the valve’s body material, with a surface coating of nickel for added protection.
The material chosen for the connection cables and plugs used for transmitting the media to and from the valves should be compatible with the media chosen. Example:
• Valve body: Polyurethane (for media like air, carbon dioxide, nitrogen, fuels, and oils)
• Seal: EPDM

Pneumatic Valve Maintenance and Maintenance Methods

Cleaning valves: Cleaning of general media, as long as the water can be washed, but the cleaning of harmful media, first of all, to understand its characteristics, and then choose the appropriate cleaning methods.

Valve disassembly: The exposed surface of the rusty parts first rust, but before rust, to protect the valve seat. Valve spool. Valve stem and other precision parts of the processing surface. Disassemble the valve seat should use special tools.

Spool. Valve seat: Two sealing surfaces have small rust spots and wear and tear can be repaired by machining methods, if the damage is serious must be replaced, but no matter whether the repair or replacement of the hard sealing surface must be ground.

Valve stem: Surface damage, only new.

Push rod . Damage to guides and sealing surfaces: For reverse acting actuators must be replaced with new ones, while for positive acting actuators, they can be used after appropriate repairs.

Compression springs: If there are cracks or other defects that affect the strength, they must be replaced.

Wear parts: Packing. Sealing gaskets and O-rings should be replaced every time the actuator is serviced. Diaphragms should be inspected for signs of cracks, aging and corrosion. Aging and corrosion traces, according to the results of the inspection, decide whether to replace, but the diaphragm use period is generally 2-3 years.

Pneumatic valve assembly should pay attention to centering, bolts should be tightened diagonally, the sliding part should be lubricated, after assembly should be debugged according to the product factory test items and methods, and in the meantime, can be more accurately adjusted to filler compression force, spool closure position in line with the valve positioner.

The Role of Pneumatic Valve

Pneumatic valves can be widely used in a variety of industrial fluid control, such as water, oil, gas and so on. The following are the common roles of pneumatic valves:
Switching control: Pneumatic valves can control a variety of industrial fluids and play a very important role in industrial production. For example, when conveying water and other fluids, pneumatic valves can control the opening and closing of the valve in order to control the flow and flow rate in time.

Flow Control: Pneumatic valves can also regulate the flow rate and velocity as needed. Flow control is usually used in situations where precise control of fluid flow is required, such as batching and processing in chemical production.

Pressure control: In some fluid transportation systems where pressure control is required, pneumatic valves are used to control the pressure value.

Direction control: Pneumatic valves can also change the direction of flow of liquids or gases. Pneumatic valves can play an important role in some occasions that need to change the direction of fluid flow, such as in the production line to control the direction of liquid flow.

Our Factory

AKS Pneumatic Components Co,Ltd.established in 2006 is a professional manufacturer engaged in the research,development,production,sale and service of pneumatic fitting,cylinder,solenoid valve,air source treatment,muffler.We located in Xinguang Industry Zone Liushi,Yueqing,adjacent to the beautiful scenery of the yandang mountain,a few kilomters away from Wenzhou airport,the geographical position is superior,the traffic is very convenient.We dedicated to strict quality control and thoughtful customer service,our experienced staff members are always available to discuss your requirements and ensure full customer satisfaction.In recent years our company has introduced a series of advanced equipment including the injection molding machine,automatic instrument machine and automatic assembly machine.AKS company has strong technical force,advanced production equipment to provide customers with high performance products,in addition we have obtained the products test report and certificate from the goverment,our products sell well in all cities and provinces around China,our products are also exported to clients in such countries and regions as Italy,Germany,Turkey,India,Iran,Vietnam,Bangladesh,Dubai etc.the customers prefer our products very much.Whether selecting a current product from our catalog or seeking engineering assistance for your application,you can talk to our customer service center about your sourcing requirement,we sincerely hope you will cooperate with us.

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FAQ

Q: What are the basics of pneumatic valves?

A: Pneumatic valves are typically created with three port numbers: 3, 4, and 5. 3-port valves are considered 3-way valves that can control a single cylinder port. Valves with 4 ports can control two-cylinder ports with the help of a single common exhaust port. 5-port variants allow for individual exhaust ports.

Q: How much pressure does a pneumatic valve need?

A: Pressure at this main header could be 120 psi or more, but a branch circuit could be regulated at 90 psi, for example. Most regulators are capable of relieving downstream pressure, which prevents that downstream pressure from elevating as a result of load-induced pressure or thermal expansion.

Q: What is the most common pneumatic valve?

A: The most commonly used valves are the 3/2, 5/2 and 5/3 valves. With the various valves, different functions can be realised in a pneumatic system. A 3/2 valve has three ports for supply (1), output (2) and exhausting (3) respectively, combined with two switching positions.

Q: What is the theory of pneumatic valve?

A: What is pneumatic valve? Pneumatics is a system that uses a difference in pressure of compressed gas or air for its operation. Such schemes contain a number of different mechanisms through which compressed gas is distributed. All together, they act as a centralized system.

Q: What is the failure of pneumatic valve?

A: There are three common failures for diaphragm pneumatic globe control valves, loss of air supply, loss of electric power, and loss of signal.

Q: What is another name for a pneumatic valve?

A: A pneumatic valve, commonly referred to as a directional control valve blocks or diverts the flow of compressed air or other gases within a system.

Q: What is the pressure in a pneumatic valve?

A: This valve is an air close, spring open, globe valve. Air pressure at approximately 6 bar (87 psi) is applied to the top of the diaphragm to close the valve. Air is then bled from the pneumatic line to open the valve.

Q: How do you classify pneumatic valves?

A: Two-way Directional Valve: Air passes in one direction, through two ports. These ports can be closed or open.
Three-way Directional Valve: This valve has three ports, which each serve a different purpose. ...
Four-way Directional Valve: This valve has four or five ports.

Q: How are pneumatic valves controlled?

A: Pneumatic control valves divert the flow of control air from one port to another, which feeds other pneumatic valves with signals, or openss and closess pneumatic actuators. In a 3/2 normally closed valve, compressed air enters the valve at port 1 and is held there until the valve receives a command to change position.

Q: How do you troubleshoot a pneumatic valve?

A: Check the pressure regulator valve to make sure there's sufficient pressure, and the flow control valve in case you've got too much choke. You might need to replace the filter if it's clogged up, and clean out contaminants. You should also look for pinches in the hoses, and check for air or fluid leaks.

Q: What is the major cause of valve failure?

A: Incorrect assembly and installation are some of the leading causes of valve failure. It is imperative to follow best practices, with this in mind, to prevent problems, down the line. In the same vein, maintenance procedures should be carried out according to strict guidelines specific to your valve.

Q: What is the most reliable valve type?

A: Ball valves may be the most reliable valve and are commonly used for main water shut offs. Similar to gate valves, ball valves should be all the way open to allow the full flow of water or all the way closed to restrict all water from flowing. The valve is controlled by moving it between 0 and 90 degrees.

Q: How to size pneumatic valves?

A: Valves are typically sized based on how much air they can move. The flow coefficient or 'Cv of the valve' is critical to determining if a cylinder or other actuator can move with sufficient speed for the application. A valve with a higher Cv can move more air.

Q: What is the failure rate of pneumatic valves?

A: It helps to smoothly regulate the flow of gas and liquid within a system. Solenoid valves VOFC and VOFD in compliance with the latest SIL classification guarantee a failure probability rate of 2.41 E-4 and a safe failure fraction of 75%.

Q: What are the basics of pneumatic valves?

Q: How do you lock out a pneumatic valve?

A: Lockout Operation - With the handle pushed inward, inlet port 1 is blocked. Outlet port 2 is open to exhaust port 3.

Q: Why do pneumatic valves fail?

A: Reasons: there is no signal pressure or diaphragm cracks, diaphragm leakage, diaphragm thrust reduction, valve core and valve seat or bushing jam, valve stem bending and other reasons make the control valve unable Action, solution: connect the signal line and the air supply connector firmly or replace the diaphragm.

Q: What is the theory of pneumatic valve?

Q: How are pneumatic valves controlled?

Q: How do you close a pneumatic valve?

A: The valve closes or opens by moving the spool or poppet. Mono-stable valves return to their default position, which is accomplished by spring force. In case of indirect operation, the spool is not directly actuated by the solenoid. The valve uses the system pressure to move the spool.

As one of the leading pneumatic valves manufacturers in China, we warmly welcome you to wholesale high-grade pneumatic valves made in China here from our factory. All our products are with high quality and low price. For more cheap products, contact us now.