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Use the valve test bed to test the valve pressure and leakage

Valve test medium, generally normal temperature water, important valves can use kerosene. Safety valve constant pressure test, can use nitrogen more stable gas, also can use steam or air instead. For diaphragm valves, test with air. Pressure and leakage tests must be conducted by valve test bed before installation, whether new or repaired valves are used.

Valve pressure test means body strength test. Valve leakage test, refers to the sealing surface tightness test, these two tests are to check the main performance of the valve.

Following picturer is Xinjiang a valve maintenance unit inverted double pressure valve test bed debugging site

image.png

Field debugging of valve test bed

Use the valve test bench to test the valve pressure and leakage three steps:

1, open the valve access, fill the valve cavity with water (or kerosene), and increase the pressure to the pressure required by the strength test, check whether the valve body, valve cover, gasket, packing has leakage.

2, close the valve road, pressurize one side of the valve to nominal pressure, check whether there is leakage from the other side.

3, turn valve upside down and test on opposite side.

(1) Nominal test pressure of valve is from 0.4mpa to 32Mpa. For these commonly used pressure valves, the test pressure of valve strength is 1.5 times of its nominal pressure. Valve seal test pressure, equal to 1.1 times of nominal pressure.

(2)Valve test method valve pressure test leakage, in the valve test bench. The structure of the valve grinder, which has a pressing part above and a pipeline connecting with the pressure test pump below. After the valve is pressed tight, the pressure test pump works. From the pressure gauge of the pressure test pump, you can read the pressure of the valve. Valve test pressure filled with water, to the valve air exhaust. Test table upper pressure plate, with vent, with small valve open and close. A sign of clean air is that all that comes out of the vent is water. After the vent is closed, the pressure increases. The boost process should be slow, not sharp. After reaching the specified pressure, hold it for 3 minutes, the pressure will not become qualified.


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    Slika od Paul Liang
    od Paul Liang - četrtek, 9. julij 2020, 08:59
    vidno vsem

    Advertising signboards are not just for advertising, but also represent the image of the store brand. Therefore, merchants pay special attention to the design of advertising signboards. Their design style directly reflects the nature, cultural heritage, and strength of a store.

    So what are the types of the bottom plate of door head advertisement sign? Red PVC foam board supplier shares with you.

    1. Three-dimensional gusset

    The three-dimensional buckle board is a three-dimensional decorative board with full personality. Its shape is stylish and simple, and the three-dimensional sense and layering coexist. The three-dimensional buckle board can produce a variety of graphics and texture buckle plates according to different molds. Various types of boards can be freely combined. There are dozens of colors for you to choose from to meet various personalities. The three-dimensional gusset is fire-retardant, washable, and easy to install. The three-dimensional effect presented by different monoblock combinations is extremely eye-catching.

    2. Color steel buckle board

    The color steel buckle board is rich in color, bright and not easy to fade, strong, and various types of fonts can be installed on it; the production and installation are fast and convenient, the layout effect is simple and outstanding, giving people a bright feeling.

    Color steel gussets are divided into three categories: rounded corners, right angles, and square shapes. The length can be arbitrarily customized according to requirements and can be installed horizontally and vertically. The formed galvanized color-coated plate and the corresponding keel will splice the color steel buckle plate into one. Using different keels can assemble the effect of the buckle plate gap from 0-60mm. The high-cost performance makes it occupy a certain market.

    PVC Foam Board

    3. Signboard

    The signature version is exquisite in appearance and fast in installation. It is made of galvanized steel sheet as a raw material, which is strong and impact resistant. The installation structure is highly sealed, the plates can be seamlessly connected, and the safety and performance are of high quality.

    4. Painted glass

    Painted glass has water resistance, strong adhesion, color selectivity, and stain resistance, and is easy to clean. It can be applied to glass countertops, glass image walls, glass background walls, glass fences, store interior, and exterior space design, etc. At present, the market is widely used.

    Fifth, aluminum composite board

    There are many types of aluminum-plastic panels to meet your selection needs to the maximum. The material is easy to process, has good flexibility, and does not damage the topcoat. It also has super fire protection, impact resistance, and sun resistance.

    6. PVC Foam Board

    The carved patterns of PVC boards are diverse, and customers can choose different styles. The color of the material is mainly black and white, which can be painted, and there are different color options. It can be used on different occasions to achieve different visual effects. The overall effect is generous, eye-catching, and novel.

    And PVC foam board has certain weather resistance, not easy to deform, not easy to fade.



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      How to buy a cabinet board? Polystyrene foam board supplier shares with you.

      1. Environmental protection

      Whether the cabinet board is environmentally friendly, the most intuitive feature is the small smell. Usually, when you first enter the kitchen, you can feel it. In addition, the manufacturer can be allowed to issue a test certificate for the environmental protection standards of the plate.

      2. Moisture resistance

      The kitchen is generally damp, so it is best to choose a board with better moisture resistance.

      3. See the thickness

      If the kitchen has high water vapor, or the temperature is high for a long time, it is best to choose 18mm thick plates; in this way, the life of the cabinet will be doubled.

      4. Backplane

      In order to save costs, some manufacturers will use a single-sided backplane. After the backboard is installed, the side against the wall is exposed. The harmful gas in the board is easy to evaporate and deformed by moisture.

      WPC Board

      Advantages of cabinet board

      1. Fire, moisture, corrosion, and penetration resistance.

      2. It is resistant to oil, dirt, acid, and alkali, easy to clean, and easy to take care of daily.

      3. Wear-resistant, scratch-resistant, impact-resistant, durable, no deformation, no fading, no cracking.

      Our company also provides a WPC board. WPC boards show good performance, but monolithic composite boards are relatively heavy (usually heavier than pure plastic), which limits their use in applications that do not require lightweight. WPCs in the form of sandwich structural composites can combine the advantages of traditional wood polymer composites with the lightness of sandwich panel technology. WPC sandwich panel is composed of wood polymer composite skin and usually low-density polymer core, which can effectively improve the rigidity of the panel. WPC sandwich panels are mainly used in automotive, transportation, and construction applications, but furniture applications are also being developed. Compared with the traditional plastic sheet or integral WPC panel, the new efficient and often online integrated production process can produce a stronger and stronger WPC sandwich panel at a lower cost.


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        Slika od Paul Liang
        od Paul Liang - četrtek, 9. julij 2020, 08:58
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        Bathroom cabinets are indispensable in the bathroom. Of course, there are many materials for bathroom cabinets. If you want to choose a suitable bathroom cabinet, some problems cannot be ignored. You must master certain skills and methods. You want to buy a satisfactory bathroom cabinet. KT board supplier teaches you how to choose. 1. Material When choosing a bathroom cabinet, be sure to check the material of the bathroom cabinet, pay attention to whether the material is scratch-resistant, high temperature resistant, and most importantly waterproof, after all, the bathroom cabinet is a humid place all year round. 2. Style There are two types of bathroom cabinets, floor-standing and wall-mounted. The floor-standing bathroom cabinet is suitable for a modern bathroom with a large space and separated by wet and dry. The wall-mounted design saves space and is easy to take care of. Bathroom Cabinet PVC Foam Board 3. Area and design The traditional bathroom has a small space. You can choose a single cabinet combined with a mirror or a hanging cabinet suitable for the corner, which does not affect the original space and does not need to replace the basic equipment. 4. Color The colors of the bathroom cabinets are various, and the purchase should be consistent with the overall design of the bathroom. Light colors can make the bathroom look neat and elegant, dark bathroom cabinets are more resistant to dirt, and the use of translucent mirror texture colors can make the bathroom look clear and cool. 5. Style match Bathroom cabinets are mainly in four styles: fashion, nostalgia, freshness, and simplicity. Fashionable bathroom cabinets use bold colors and designs, which are suitable for young owners' home decoration; while nostalgic and classic style bathroom cabinets are elegant and generous, which can enhance the taste of the bathroom; natural and refreshing bathroom cabinets are the mainstream of fashionable bathroom cabinets. First, the design is not too exaggerated, suitable for a variety of styles of bathroom design; and the simple style is more used by people. Although the simple design has fewer surprises, it is more practical and not ingenious. Our company provides a bathroom cabinet PVC foam board.
        [ Spremenjeno: četrtek, 9. julij 2020, 08:58 ]

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          vidno vsem

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              Slika od Royan Luo
              od Royan Luo - četrtek, 9. julij 2020, 08:02
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              High Reflectivity Optical Mirrors

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                Slika od maggie zhang
                od maggie zhang - četrtek, 9. julij 2020, 08:00
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                Our company is major in lockout, the valve lockout and custom valve lockout. But also they are high in quality and poor in price. In our company, you can find the best goods. Because of our perfect products, we win a lot of customers. Now we are looking forward you can place orders with us, we will try our best to make your satisfaction.

                              Something of our lockout, do you know?cid=3

                The custom valve lockout can stop the operation of the controllable valve by stopping the control pulse of the valve. Our valve lockout has divided into custom valve lockout and universal valve lockout,the character of them as follow: The characteristic description of valve lockout, Our universal valve lockouts are effective for all types of standard valves. Can also be used to lock out large levers, T-handles and hard-to-secure mechanical devices. This series butterfly valve has reasonable and reliable mechanical structure, strong compression resistance, reliable opening and closing, and positive and negative bidirectional sealing function. The installation is not limited by the flow direction of the medium or affected by the space position, and can be installed on the pipeline at will. The valve shaft of this series butterfly valve adopts semi-axle structure, the valve plate adopts pile frame structure, the shaft and valve plate are tightly assembled and mechanically fastened by pins, the valve has high compressive strength, small flow resistance, large flow area and energy conservation, the shaft sleeve adopts self-lubricating tin bronze, the friction coefficient is small, and the opening and closing are flexible. This series of butterfly valves adopt a double eccentric spherical sealing structure.

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                  vidno vsem

                  Refrigeration solenoid valve is industrial equipment controlled by electromagnetic. It is used in industrial control system to adjust the direction, flow rate, speed and other parameters of medium. What should I do if the cooling solenoid valve fails? Solenoid valve manufacturers share with you.

                  Fault phenomenon 1: The solenoid valve does not work after being energized

                  elimination method:

                  Whether the power wiring is bad → rewire and connect the connector;

                  Whether the power supply voltage is within ± working range -→ adjusted to the normal position range;

                  Whether the coil is de-soldered → re-welded coil short circuit → replace the coil

                  Whether the working pressure difference is inappropriate → adjust the pressure difference → or replace the proportional solenoid valve;

                  Fluid temperature is too high → replace the proportional solenoid valve;

                  There are impurities that make the main valve core and moving iron core of the solenoid valve stuck → perform cleaning,

                  The viscosity of the liquid is too high, the frequency is too high and the service life has reached → replace the product.

                  Solenoid Valve

                  Fault phenomenon 2: Solenoid valve cannot be closed

                  elimination method:

                  The seal of the main valve core or iron moving core is damaged → replace the seal;

                  Whether the fluid temperature and viscosity are too high → replace the solenoid valve on the opposite port;

                  There are impurities entering the valve core or moving iron core of the solenoid valve → cleaning;

                  Spring life has reached or deformed → replace;

                  Throttle balance hole clogging → timely cleaning;

                  The working frequency is too high or the service life is over → change the product or update the product.

                  Other failure conditions:

                  Internal leakage → Check whether the seal is damaged and the spring is poorly assembled

                  External leakage → the connection is loose or the seal is broken → tighten the screw or replace the seal

                  There is noise when power is applied → The firm parts on the head are loose and tightened.

                  If the voltage fluctuation is not within the allowable range, adjust the voltage.

                  The impurities or unevenness of the iron core suction surface should be cleaned or replaced in time.

                  Failure phenomenon 3: solenoid valve does not change direction

                  If the solenoid valve core or the slider cannot be moved and is fixed in one position, the cooling or heating of the air conditioner cannot be converted to each other. Generally, the most common faults are only cooling, not heating, and at the same time, the air conditioner is protected against cold wind protection, the outdoor unit is running, and the indoor unit is not blowing hot air, and it stops after displaying the fault light.

                  Fault phenomenon 4: short circuit of solenoid valve coil

                  When the air conditioner is switched to heating operation, the solenoid valve coil is over-current due to a short circuit. In severe cases, the fuse on the main control board is burned out or tripped, causing the whole machine to not work properly.



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                    Slika od Yunyin Ding
                    od Yunyin Ding - četrtek, 9. julij 2020, 07:45
                    vidno vsem

                    The role of the valve is to control and guide the flow and direction of refrigerant in the system, cut off and conduct the connection between the equipment and the equipment or the equipment and the outside world. Improper operation of the valve can cause unsafe factors or cause accidents, so the operation of the valve must strictly abide by the operating rules to avoid accidents. Cold storage valves mainly include globe valves, expansion valves, and safety valves according to their uses. There are two types of globe valves: straight-through valves and angle valves. The safe operation of the valve should do the following work:

                    1) The operator must be sure about the operation of the valve and do not accidentally open other valves to cause human accidents.

                    2) When opening the suction valve of the compressor, the discharge valve of the condenser or the accumulator, it must be carried out slowly, and sometimes it should be started and stopped alternately, so as to avoid the wet stroke accident of the compressor due to too fast opening speed.

                    3) During the opening of each valve, especially when it is close to the maximum opening, you must slowly pull the handwheel without excessive force, so as to avoid the phenomenon that the valve core is caught by the valve body and the valve is pulled off. When the valve is at the maximum opening (limited to the handwheel can not move), the handwheel should be rotated one or two times.

                    Cold Storage Valve

                    4) The operator should pay attention to the proper force during the closing of each valve, and not use too much force, so as not to damage the valve.

                    5) For pipes and equipment with liquid refrigerant, it is strictly forbidden to close the valves at both ends at the same time, so as to avoid the expansion of the liquid due to the absorption of external heat and the explosion of the pipeline or equipment caused by ammonia leakage. Under normal circumstances, most liquid bursts crack at the valve. The correct way to prevent a liquid explosion is to evacuate the liquid in the tube when closing the valve of the liquid tube. Under special circumstances, when the liquid pipe cannot be evacuated, only the valve at one end of the liquid pipe should be closed, so that the valve connected to the equipment at the other end is in the open state. If the compressor is completely stopped, the supply of the liquid reservoir should be closed first. Liquid valve, wait for the system and liquid pipe to evacuate, then close the main liquid supply valve to the regulating station.

                    Particular attention should be paid to the parts where liquid explosion may occur in the refrigeration system. These parts are the liquid pipeline between the condenser and the reservoir, the pipeline from the high-pressure reservoir to the expansion valve, the liquid pipeline with shut-off valves at both ends, the liquid level gauge of the high-pressure equipment, and the liquid between the ammonia container Balance pipe, liquid distribution station, the pipeline below the outlet valve of the circulating liquid reservoir to the double suction end of ammonia, the liquid supply pipeline of the ammonia pump, the pipeline from the liquid reservoir to the emergency ammonia drain, and all pipelines that may cause a liquid explosion.

                    6) Valves that do not open and close for a long time should be regularly checked for opening and closing flexibility.

                    7) The safety valve in the refrigeration system must be corrected once a year, and the safety valve in question should be repaired or replaced in time.

                    8) Add the red and yellow opening and closing plates made of color steel plate to the handwheel of the valve to avoid misoperation as much as possible.

                    The above information is provided by the overflow valve factory.



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