Valve testing bench is used for reliable sealing quality of valves and valves after inspection and maintenance. The last step after valve production and valve disassembly inspection and maintenance is pressure test. The detection method used should be based on national or international standards. American standards (ANSI / ASME, API), German standards (DIN), European standards (EN), and international standards (ISO) are the most commonly used standards. Pressure test bench tests on valve sealing performance can be divided into the following types: Shut-off valves (gate valves, globe valves, ball valves, check valves, etc.) Control valve safety valves Although the standards for valve pressure test are different, but for each The detection method is roughly the same for each type of valve. The most important ones are: testing the strength of the valve body; testing the tightness of the valve body, stem and shaft joint; testing the tightness of the seat or base (if possible); determining the take-off pressure of the safety valve. Achieving maximum benefits and lasting and stable maximum benefits are the operating goals of every healthy enterprise.
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2 disadvantages
The cost of valve testing machine imported from abroad is too high, the sales and after-sales service channels are not perfect, and the domestic valve test bench needs to be perfected at a late start.
Valve Testing Bench
3 working principle
Valve testing bed adopts the clamping method of positioning on the valve flange end face and the movable anti-jaw to clamp the back of the flange. There is no external force that affects the test results of the valve under test, and it meets the valve test requirements specified by national standards.
The structure of this machine can be roughly divided into hydraulic system, electrical control system, movable jaws of left and right table, hydraulic pressure supply device and media circulation system. The right table is provided with a clamping mechanism and a 90-degree turning mechanism. The clamping mechanism is composed of a clamping device of a clamping jaw and a radial movement device. The clamping device of the clamping jaw is directly driven by each oil cylinder to make each claw receive. Uniform force and reliable clamping. The radial movement device of the clamping jaw adopts a lever type structure, and realizes the radial synchronous movement of each jaw. The left workbench can advance and retreat automatically. And has the characteristics of good performance, simple and compact structure. The hydraulic electrical control system is installed in the bottom fixed frame and is the control part of the test bench. Under the joint control with the electrical equipment, the various agencies can coordinate their actions to meet the requirements of the test procedure.
4 Features
The valve test bench integrates electromechanical, hydraulic, pressure testing, and storage and recycling of liquid media into one, and has the characteristics of complete functions, stable performance, and high degree of automation. It is widely used for strength, sealing and leakage of various high, medium and low pressure valves with straight-through flanges with nominal diameters DNl 5-mm and various performance tests. Test medium: water, gas, oil. The maximum sealing test pressure is 32.0 MPa, and the strength is 48 0 MPa.
Gate valves are usually used to shut off fluid flow completely or provide full flow. Gate valves generally operate in either fully closed or fully open positions. Gate valves only have a few parts, which makes them easy to install. The components of gate valves are a valve body, seat and disc, a spindle, gland, and a wheel for operating the valve.
Thank you for reading our article and we hope it can help you better understand the advantages and disadvantages of gate valves. If you want to learn more about sanitary valves, we would like to advise you to visit the Adamant Valves homepage for more information.
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This article will explain the advantages and disadvantages of gate valves and the scope of application. A gate valve is a valve in which the opening and closing part moves along the vertical direction of the pipeline channel axis. The
opening and closing part is called a gate, which is mainly used to cut off the flowing medium in the pipeline and can only be used fully open or fully closed. Therefore, the gate valve cannot be used as a regulating valve to regulate flow. Gate valves of different materials are adapted to different environments and temperatures, but gate valves are generally not used in pipelines that transport mud and other media, because these media contain impurities, which will affect the sealing effect of the gate.
Advantages of gate valve:
1. It can only be fully open and fully closed. When the gate is fully open, the resistance of the fluid through the valve is small;
2. The torque required for opening and closing is small and labor-saving;
3. It can be used in pipelines where the medium flows in both directions, and the flow direction of the medium is not restricted;
4. Compared with the shut-off valve, when the gate valve is fully opened, the degree of erosion and erosion of the sealing surface by the fluid medium is low;
5. Simple structure, convenient installation and use, and good manufacturing technology;
6. The overall structure length of the valve is relatively short.
Disadvantages of gate valve:
1. The overall dimensions and opening height are relatively large, which requires a large installation space;
2. When the gate is opened and closed, the friction with the sealing surface of the valve seat is large, causing certain wear on the sealing surface;
3. Usually the gate valve has two sealing surfaces, which is difficult to process and grind, and it is quite troublesome to maintain;
4. It takes a long time to open and close.
Gate valves usually have more applications in the following areas:
1. Oil and natural gas pipelines.
2. Transportation pipeline and storage equipment of refined oil.
3. Wellhead Equipment for oil and natural gas exploitation.
4. City gas transmission pipeline.
5. Tap water and sewage treatment projects.
Right now, there are over 3,000 facilities on the Outer Continental Shelf involved in the collection and treatment of oil and gas. These oils and gases are collected from wells -- a process that's performed using certain types of high pressure valves. Of course, different types of American ball valves offer different results and it's crucial that the right projects are executed with the right types of valves. Quite often, the types of valves being used are ball valves, sometimes referred to as pig ball valves or pig vales (as they are used in conjunction with pipeline pigging systems). Before sourcing and investing in valves, it is important to understand the degree to which these valves may differ from one another. Let's delve into some of the defining characteristics of ball valve types.
Ball Valve Body Styles Before getting into the exact types of ball valves that are available at the moment, it's important to remember that there are actually four separate types of body styles. These include the single body, split body, top entry, and welded styles. The styles of ball valves available differ from the types of ball valves available. This means that there are number of potential variations that you can see in ball valves. The great thing about this variety is that it means that there is more potential applicability in ball valves than there would be otherwise. Full Port Ball Valves: Turning to the different body types of ball valves, we can first look at the full port ball valve.
A full port ball valve is defined by the fact that it has an oversized ball. The oversized ball has a purpose -- it is the same size as the pipeline. This means that there will be less potential friction less than there would be if the ball wasn't the same size as the pipeline, and the flow involved is unrestricted. The valve is larger as well. Standard Port Valves: As their name suggests, standard port valve are quite usual. This means they're less expensive than some alternatives. This type of valve has a smaller ball, and therefore the valve itself is smaller as well.
The flow going through the pipe will in turn be smaller and will typically be about one pipe size smaller than the valve's pipe size. This makes it more restricted. The V Port Ball Valve: The V port ball valve is named after its V-shaped seat. What this means is that the orifice through which the product flows can be more easily opened and closed to change its direction. While many like this idea, the construction of this type of valve means that it can't be used just anywhere. It typically needs to be utilized in a more secure site. When the valve is opened, it is usually opened at the "small end" first, which helps stabilize the flow control. Trunnion Ball Valve: Then there is the trunnion ball valve, which doesn't exactly give much away through its name. This type of valve will actually anchor the valve at the top and the bottom through a particular mechanism. This would be applied on larger and more high pressure valves.
While this type of valve isn't going to fit everyone's needs, it can definitely be used for particularly high pressure projects. Manually Operated Valves: Finally, these types of valves can be closed more quickly than their counterparts. Though this is an advantage in some cases, it also means that there can be a risk of a water hammer. These can include an actuator, which can be pneumatically or motor operated, which will in turn be used for on/off flow control. The valve will also have a positioner, which transforms the control signal into an actuator position. The flexibility of this type of valve is certainly an advantage to most projects. Now that you're more familiar with the styles and types of ball valves, you'll be in a better position to make decisions that will support Your Needs. For more information, please contact us today.
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