Professional Onoff Valve Manufacturer in China

BCST your Expert On-Off Valves Supplier in China

What is the working principle of the on/off valve?

The functions of the on/off valve are to manage the flowing of the fluid or gas. When there is no pressure of air, then the valve opens automatically. In the body of the valve, you will see the rubber tube. The tube shrinks when you apply the pressure to close the valve. You can complete the larger valves with one or more pistons. The on/off valve also opens through the force applied. The piston in the rubber tube is pulled and helps the fluid to flow easily. When the pressure gets revert, it comes back to its Cloe normal state.

What is the difference between the on/off valve and control valve?

Whenever you are setting fluid controlling system, and there are various kinds of valves available. It depends on your own choice. The control valve helps in controlling the flow of the liquid that exists in the system. You can maintain the variables like pressure, temperature, rate of flow, and liquid level at some particular points. Whereas, on/off valve is the less accurate Instrument as compared to the control valve. The on/off valve will also help flow the fluids without any hurdle or shut. Mainly, it makes the route of the fluid to process.

What is the symbol of the on/off valve?

The International Standard ISO 1219-1 has created the pneumatic symbols. It also comprises the symbols, which are also the graphical representation. They are the symbols of the systems where the fluid is flowing along with its components. But, the marking of the valves are the references from the CETOP RP 68 P. It is the community of fluid power that exists in Europe.  The representation of the functionalities of the on/off valve is in numerals. It is in pairs and separated by strokes; for example, 3/2, the first number shows the ports present. The second number indicates the state’s number that the valve will achieve.

What are the parts of the on/off valve?

The following are the parts of the on/off valve:

• A-jet on/off valve repairing kit
• Oil-free actuator
• Dual on/off valve rebuilding kit integrated
• Dual on/off valve rebuilding kit not integrated
• Dump valve jewel integrated on/off valve
• Dump valve jewel not integrated on/off valve
• Retained screw on/off valve
• Inlet body on/off valve
• Repairing Taj and pulling to open
• Screw for retaining on/off valve
• Actuator free from oil
• Fixing kit of on/off valve
• Body of on/off valve (integrated)
• Body of on/off valve (non-integrated)
• Tilting the jet and on/off the valve body
• Set of the screw
• Sealing the on/off valve

For details regarding the price, you can contact our team of BCST.

ما هي أنواع on/off valves?

Butterfly valves: Those on/off valves that turn quarterly make the fluids flow in and out. Most power plants, processing plants, and wastewater plants use a butterfly on/off valve to regulate and process the flow. It handles the pipelines whose diameter is large. Most butterfly valves are smaller in size. But it is cheaper as compared to the ball valve. Sometimes, it is difficult to handle the butterfly valves wherever the pressure is high. But, still, it is among the preferred choices due to its simple design.

The main components butterfly on/off valve is the valve’s body, disk, seat, and steam.

Structure & Features of Butterfly Valve:

International Compatibility:

• ISO 5211 mounting flange
• Enables direct mounting of various actuators

Anti-Blow Out:

• Retaining ring preventing the blow out of stem on pressure

Precision Splined Shaft:

• Pinless connection with a disc to avoid leakage from the disc and convenient replacement of valve parts

Manually Polished Disc Edge:

• Disc machined by CNC and polished manually ensures long life and low torque and bubble tightness.

Rubber Seat Design:

• Replaceable rubber seats designed with rib and groove, preventing movement against valve body ensure the strong sealing and stability.

Wafer or Lug Connection:

The body could be wafer or lug type suitable for various flange standard

من هي الشركات المصنعة لـ on/off valves?

There are manufacturers of on/off valves around the world. Most of them belong to China, Japan

, France and UK. BCST is among the manufacturers who are based in China.  For 30 years, we are manufacturing and delivering high-quality products to different parts of the world. Our specialties are in the research area and dealing with several instruments. It also includes an on/off valve. While manufacturing on/off valves, the material we use is stainless steel, cast iron, and steel. It also deals with specific requirements. A range of valves are available on/off valves, instrumentation valves, and control valves included.

ما هو on/off valve actuator?

As the industries are progressing, they need new equipment for receiving efficient outcomes. It is also the solution to the problems that technicians, designers, and engineers have faced. The actuator is one of them. The actuator is a black box in which input, output, and circuit make the valve work. In the control mode, there are two kinds of valve actuators found. One is modulating valve actuator, and the other one is the on/off valve actuator. The on/off valve actuator is also called an open-loop actuator. In this kind of actuator, two essential functions are performed, and operations of the valve are dependent on it.  Its primary purpose is to entirely open or close the valve.

ما هي مواصفات on/off valve?

For listing the specifications of the on/off valve, the data-sheet is provided to the customer. In this sheet, the following things are included and collected to complete the requirements.

• Place of the installation
• Type of the connection in need
• The total diameter of the pipe
• How much will be the maximum temperature and pressure
• The type of actuator to use
• The kind of applications require
• Any additional requirements
• The type of on/off valve to use
• Which size of the valve is necessary?
• What should be the temperature of the surroundings
• How many ports and connections do you need

ما هي تطبيقات on/off valves?

The applications of industries commonly use on/off valves. Like:

• Cement industry
• In the handling of granulate and pigments
• In the sectors of ceramics, glass, and plastic
• For treating the wastewater
• By pharmaceutical companies and in foodstuffs
• In the making of wine
• In weighing and metering systems
• For coating with the powder
• In the methods of toiletry and vacuum
• Controlling the units of compressed air

The industrial valves are with a rubber hose. It controls the flow and has become popular in different sectors. No employees need training while using it.

Is there any example of an on/off valve?

The most common example of an on/off valve is a water on/off valve.

These valves are available in your own house. The main valve is the most important one as you can shut off your home’s water supply through it. The location of this valve is either in the basement, or the box is placed underground out of your house. In addition, different fixtures like sinks, heaters, and toilets have an on/off valve put nearby.

During repairs, you can shut off the on/off valve without any hindrance. Mostly, it is available in two types: opened one and closed one. Both of them are used individually according to the need.

What is the purpose of using an on/off valve?

Mainly the on/off valve act as the part in the units of gas preparation. It saves money and time. It is the best approach for consideration. The equipment present in the on/off valve is easy to maintain without impacting the remaining system. It avoids the air reaching the point where the application is working. The operations of the on/off valve are simple so that it can handle the risks. Even, there is some maintenance going on or any equipment fails. While closing, some of them on/off valves are locked. For this reason, you can use it in many industries.

What are the uses of an on/off valve?

On/off valves work precisely as the name shows that is it gets turned on and off. You can use the on/off valve in emergencies. It also helps in aligning the channel of the whole system. So that’s it doesn’t get shut. You can also open or close the channel without facing any difficulty. There are different types of on/off valves that facilitate differently and behave according to the situation. But it would help if you controlled some factors.

What is the difference between gate on/off valve والكرة on/off valve?

Although both gate and ball on/off valve functions are the same, their structure and working are different. There is a ball and stem which turn in the horizontal direction. Therefore, it is best suitable for the applications on and off control, and no pressure drop is required.

Gate valves can be open by lifting the rectangular gate. All the gate on/off valve characteristics is the same as the shut on/off valve. However, the rate of failure is less in ball valves as compared to gate valves. You can use the gate valves wherever the flow of the fluid is in a straight-line direction.

Is an on/off valve same as a control valve?

A control valve is a device used for regulating and manipulating the flow of fluids. The fluids can be steam, oil, gas, or water. It is among the commonly used elements for controlling that are used in the industries. The response to the signals is given and sent from the controllers.  It is designed so that the essential variables can process like flow, level, and temperature. The on/off valves and control valves are similar, but their controlling way is different. Control valves are very accurate, and on/off valves do turn on and off.

How to shut water on/off valve?

The water that comes to your house from the fixture. It has a valve that you can control. The on/off valve is the main valve that might shut the whole water supply of your house. First, you need to look at and recognize the meter box.  Make sure it is covered with plastic or cement. It must be near your place or in the walking area of the street. After looking for it, do digging. You will see the pipe, and this is the location of the pipe. Turn it off in the correct position. It is a little bit tricky. A proper tool is required to shut off the water on/off valve. 

What is the role of pneumatic on/off valves in industrial systems?

Several industries are using pneumatic on/off valves. Conclusion: There help control the flow of the gases and liquids and at the high-level pressure. Or according to the industries dealing with compression of the atmospheric pressure. A manual or electrical system is available to operate these on/off valves. The pneumatic on/off valves are now an essential asset of all the industries, and they are using it widely in making paper, pharmaceutical productions, and colouring applications. The usage of pneumatic on/off valves is extremely useful in hazardous areas or even if there is any occurrence of leakages. You need to use the pneumatic on/off valves during the manufacturing processes because of their safety protocols at high-level. Install the pneumatic on/off valves for protection purposes and proper working methodologies.

Why and which industries prefer the pneumatic on/off valves?

Many industrial applications use pneumatic on/off valves along with the rubber seat in soft texture. These on/off valves are useful at high-extend because of facilitating in terms of support, functionalities, and reliability in all the controlling methods.

Reasons for replacing other control methods and preference of pneumatic on/off valves:

Below are the reasons for preferring pneumatic on/off valves nowadays in the industries:

• The cost is pneumatic on/off valves منخفضة نسبيًّا
• Even the pneumatic on/off valves are smaller in size
• The availability of pneumatic on/off valves are in lightweight
• The pneumatic on/off valves are highly accurate and precise
• There are no damages and blockages inside the pneumatic on/off valves

Industrial sectors using the pneumatic on/off valves:

Following industries that are using pneumatic on/off valves in their pneumatic systems:

• Cement or silo
• Controlling units of compressed air and vacuum
• Handling of granulate and pigments
• Vacuum toiletries systems
• Coating with the powder
• Plastics/glass/ceramics industries
• Systems of weighing and metering
• In the making of wine
• Treatment of water waste
• Foodstuff
• الصناعات الدوائية

Why is it better to use the tight on/off valves and the squeeze-closing sleeve?

Designs and functionality of tight on/off valves:

The rubber hose and the tight on/off valves that squeeze close are designed to tightly close or open completely to make sure that there are no leakages. The design of these on/off valves is relatively simpler in terms of working and design compared to the ball valve. For instance, to bring repeatability and reliability in the operation of tight on/off valves. The usage of these on/off valves is essential where there is an immediately cutting of the flowing medium is the priority.

Features of tight on/off valves:

• High-level actuating force
• Exact geometry for the sealing
• Longer lifespan of the material for the seating purposes
• Always bring assurance regarding the repetition in terms of performance of tight on/off valves along with elevation in integration

Reasons for the selection of the tight on/off valves and consideration as the best choice:

You must know that squeezing tight on/off valves continuously offers the flowing medium continuous on/off operation. It is among the reasons for the preference of tight on/off valves on the other kinds of valves. A rubber sleeve is also available in the housing to provide 100% assurance for the tight closing. The tight on/off valves reaction is fast and quick enough, not more than a second. These are the reasons that point towards selecting tight on/off valves.

Advantages of using tight on/off valves:

• There are no blockages in the tight on/off valves without considering the kind of flowing medium
• Completely shut off without any leakages
• There are no requirements for the maintenance of tight on/off valves

Why can’t you use the on/off valves as the control valves?

Conceptual study of on/off valves:

Despite tuning the positioner and diagnostics, there is no possibility of using the on/off valves as the control valves because the friction present on the sealing surfaces and pin connections can be the reason for the backlash and windup the shaft. Therefore, there is a usage of positioners and piston actuators.

Detail description of on/off valves:

The use of on/off valves is to meet the specifications for leakage purposes. Some industries use the control valves to control the processes, not the piping. You need to mention some percentage for the dead band and stick-slip according to the particular range of the throttle. On the tight on/off leakage class, there needs to be the specification of the on/off valves. According to its features, you can even use the ball valves and butterfly valves for the flowing medium. Also, check the table in the catalogue for the coefficients of the flow at high and low levels to select the particular valve according to it. You need to test the control valve regarding the flow element at an internal level. Its position is moving according to the readback of the positioner for the changes of small signals. The repetition of the tests is very important whenever the valve is servicing and the flowing measurement of the low noise sensitivity.

Exceptional:

To control the width of the pulse and to avoid the plugging issues, on/off valves are the right choice than the control valves because of the design of the fast and large size strokes.

Insights:

 For throttling, never use on/off valves as the control valves. In isolation circumstances, you can’t use the control valves as the on/off valves.

What are the function of on/off valves and the insertion of a rubber tube?

Functionality and working of the on/off valves:

There are two kinds of air operating on/off valves. It usually opens on/off valves whenever there is no air pressure and no opening of the on/off valves. There is a rubber tube present in the body of the on/off valves that you can name the bladder, sleeve, or membrane. These start squeezing the altogether single time when they’re the pressure starts applying on the on/off valves. According to the dependency on the rubber tube of the on/off valves that are fit in the on/off valves, there is a requirement of the air pressure for closing the on/off valves. The usage of a typical rubber tube needs 2.5 bar of pressure for closing the on/off valves. The other membranes of the rubber tube are of silicon need 3 bar of pressure for closing the on/off valves. After applying the air pressure in the on/off valves, the rubber hose is 100% closing. Therefore, it is the closing of the flowing medium inside the pipeline. The functionality of on/off valves and the second kind of actuation is usually a version of closing. These on/off valves are in the closing position with the help of single or multiple pistons for the large size on/off valves. One more time, whenever the pressure applies, the rubber bladder inside the on/off valves starts opening with the help of pistons whose attachment is with the rubber hose. The rubber hose permits the medium to flow freely. When the air pressure starts taking off the functions of on/off valves, it starts opening again to its 100% normally closing condition.

The function of manual on/off valves:

You can operate the manual on/off valves manually or along with the handwheel for opening and closing of the valves. These are unique on/off valves with a rubber bladder whose connection is direct with the piston controlled by the handwheel. If you turn the wheel clockwise, it will manually close the on/off valves or vice versa.

Benefits and functions of on/off valves

• The function of on/off valves ensures to stop the flowing medium whenever the on/off valves are in an entirely close position.
• إن on/off valves surrounding any product always ensure sealing of 100% level.
• There is a completely 100% bore offering by the on/off valves whenever the on/off valves are in the opening position
• It is straightforward to maintain the on/off valves, and the only wearable component in the on/off valves is a rubber hose.

How can you maintain the on/off valves?

Usually, the on/off valves keep undergoing multiple tasks on a daily basis. The materials of the on/off valves from which the medium starts flowing can cause damage to the safety of the on/off valves. It is due to most of the materials being corrosive. To increase the life of on/off valves, you need to maintain the on/off valves properly. The maintenance of the on/off valves is dependent on the kind, brand, and material because the manufacturing of the on/off valves is different from one another.

Steps for maintaining the on/off valves:

• The best option for maintaining the on/off valves is to follow the manufacturers’ instructions. These instructions are available with the manual while purchasing the on/off valves. All the steps are present inside the manual.
• While checking the on/off valves regularly, there are some points that you need to follow. Firstly, make sure that the on/off valves are working correctly even there is no flowing of the media. You need to be careful while increasing the pressure that it can cause damage to the pipelines. Regular checking of the on/off valves means inspection of the on/off valves is every 6 months. Also, check the on/off valves in particular situations like there can be excess water from the heavy rainfall or flooding. The extra water inside the on/off valves can also damage the pipes.

• The cleaning of the on/off valves is part of maintaining the on/off valves. Any kind of dirt particle inside the on/off valves can affect the working of the on/off valves. Also, checking the wearing of the parts of on/off valves like the ball can stop the flow of the medium present in the on/off valves. There can be defects in the material, so the best option is to contact the manufacturers to replace the parts. You can even call professional assistance to replace on/off valves.

How to select the on/off valves?

إن on/off valves are the kind of safety valves whose purpose is to stop the flowing of the materials such as water, air, or gas. Sometimes, it is very important to avoid the flow of some specific materials to prevent any mishaps. Mainly when there is an involvement of flowing of the flammable gases. There are two main kinds of on/off valves that are automatic and manual.

Manual on/off valves:

The manual on/off valves shut down automatically, while the automatic on/off valves shut down with the help of electronic systems. It is your own choice which one you want to choose. The installation of manual on/off valves are at home, and there is a lever available for the shutdown of the flowing fluid inside the pipeline. The working of the compression types is through the turning of the knob that starts moving the shaft in an upward and downward direction. Their installation is most probably in the toiletries and water pipelines of the houses. When selecting safety on/off valves, the best choice is to choose the on/off valves according to the compatibility with the construction material. So, no issue rises during the flow of the medium in the on/off valves. 

Automatic on/off valves:

The automatic on/off valves are particularly for industrial applications. In the industrial processes, there can be the involvement of hazardous liquids like gasoline and others. These on/off valves are not suitable for the home because they are expensive and available along with the complex systems.

After going through the types of on/off valves, you need to check the actual reasons for using the on/off valves. If you want the on/off valves for the kitchen sink, then select the on/off valves of stainless steel. The selection of this material is to provide assurance and avoid rusting whenever the water starts flowing from the pipes. The correct method to select the on/off valves is according to the pipelines’ usage and kind of material. After knowing about the particular type, you must all go through the reviews regarding the on/off valves. This helps save your money and time when selecting the right and safe on/off valves for your place. There are different types of on/off valves available to select accordingly to make your system start working efficiently.

أفكار أخيرة:

BCST is skilled in manufacturing different kinds of valves and uses high-quality materials in the valves. You can mention your requirements if a customized solution is required. Directly call us on your number for any query related to the on/off valve. Or you also send an email to our team members: info@bcstgroup.com.