Shanghai

Commonly used steel grades at home and abroad are here

Commonly used steel grades at home and abroad are here

Shanghai Brilliant tells you twenty valve installation precautions

 What should I pay attention to when installing valves? Let's explain the precautions for valve installation below. 1. When installing the valve, it is necessary to clean the inner cavity and sealing surface, whether the connecting bolts are evenly tightened, and check whether the packing is pressed. 2. The valve is closed during installation. 3. Large-specification gate valves and pneumatic control valves should be installed vertically, so as not to be biased to one side due to the large self-weight of the valve core, which will cause leakage. 4. There is a correct set of installation process standards. 5. The valve should be installed in accordance with the permitted working position, but attention must be paid to the convenience of maintenance and operation. 6. The installation of the globe valve should make the medium flow direction consistent with the arrow marked on the valve body, and the valve that is not often opened and closed but needs to be strictly guaranteed not leaking in the closed state can be installed in reverse to close it with the help of medium pressure. 7. When tightening the pressing screw, the valve should be in a slightly open state to avoid crushing the sealing surface of the top of the valve. 8. The cryogenic valve should be opened and closed in a cold state as much as possible before positioning, and it is required to be flexible and free of jamming. 9. The liquid valve should be configured with a 10° inclination angle between the stem and the horizontal to avoid the liquid flowing out along the stem, and more seriously, to avoid leakage. 10. After the large air separation tower is bare cold, the connecting valve flange is preloaded once in the cold state to prevent leakage at room temperature and at low temperature. 11. It is strictly forbidden to climb the valve stem as scaffolding during installation. 12. After all valves are in place, they should be opened and closed again, and the flexible and no jamming phenomenon is qualified. 13. The valve should generally be positioned before the pipeline is installed. The piping should be natural, and the position is not right, so as not to leave prestress. 14. Non-metallic valves, some are hard and brittle, some have low strength, and when operating, the opening and closing force cannot be too large, especially not violently. Also pay attention to avoid bumping objects. 15. When handling and installing valves, beware of bumps and scratches. 16. When the new valve is used, the packing should not be pressed too tightly, so as not to leak, so as to avoid too much pressure on the valve stem, accelerate wear, and open and close with difficulty. 17. Before the valve is installed, it is necessary to confirm that the valve meets the design requirements and relevant standards. 18. Before installing the valve, the inside of the pipeline should be cleaned to remove impurities such as iron filings and prevent foreign matter from being included in the valve sealing seat. 19. The high temperature valve is installed at room temperature, after use, the temperature rises, the bolt expands by heating, and the gap increases, so it must be tightened again, this problem needs to be paid attention to, otherwise it is easy to leak. 20. The installation of the valve should confirm whether the flow direction of the medium, the installation form and the position of the handwheel meet the regulations. The above is the precautions when installing the valve, I hope to bring some help to friends in need

Brilliant introduces you to what is a throttle valve? What is an overflow valve

(1) Throttle valve is a valve that controls the flow of fluid by changing the throttle section or throttle length. A flow control valve and a check valve can be combined in parallel to form a check flow control valve. Throttle valve and one-way throttle valve is a simple flow control valve, in the quantitative pump hydraulic system, the throttle valve and the relief valve are coordinated, which can form three throttle speed regulation systems, namely the inlet throttle speed regulation system, the return circuit throttle speed regulation system and the bypass throttle speed regulation system.

Valve material selection table for various media, valve material selection encyclopedia!

Symbol: A - Can or is being successfully applied   B - The application process should be noted   C - Cannot be applied   LL - Lack of data

Hoto Instalt Presur hot-plated Valveco Rektlí

Points for installing a pressure reducing valve (1) The installation of the pressure reducing valve should be carried out after the pressure test and flushing of the water supply pipe network are qualified, and the pipeline pressure test and flushing records should be checked. (2) Before the installation of the pressure reducing valve, check that its specifications and models should be consistent with the design, the external control pipeline and the connecting parts of the guide valve should not be loose, the appearance should be without mechanical damage, and the foreign matter in the valve should be cleaned. (3) For convenient operation and maintenance, the pressure reducing valve is generally installed upright on the horizontal pipeline. The proportional pressure reducing valve should be installed vertically, and when installed horizontally, the orifice of the single breathing hole pressure reducing valve should be downward, and the orifice of the double breathing hole pressure reducing valve should be in a horizontal position; Adjustable pressure reducing valves should be installed horizontally and the bonnet should be up. (4) The installation of the pressure reducing valve must be in strict accordance with the direction of the arrow on the valve body to keep the same as the direction of fluid flow. If the water quality is not clean and contains some impurities, a filter must be installed at the upstream inlet of the pressure reducing valve (we recommend a filtration accuracy of not less than 0.5mm)

Solenoid valve use failure analysis

1. The solenoid valve does not work normally after being energized Check the power supply wiring for bad links→ rewiring and connector connections, Check whether the power supply voltage is within the ± operating range - → adjust to the normal position range, whether the coil is desoldered → re-welded, Coil short circuit → replacement coil, whether the working differential pressure is not suitable→ adjust the differential pressure → or replace the corresponding solenoid valve, If the fluid temperature is too high→ replace the appropriate solenoid valve, Impurities make the main valve core and moving iron core of the solenoid valve stuck→ clean, if there is seal damage, the seal should be replaced and the filter should be installed, The viscosity of the liquid is too high and the frequency is too high and the life has reached → replace the product. 2. The solenoid valve cannot be closed The seal of the main spool or iron core is damaged→ replace the seal, Whether the fluid temperature and viscosity are too high→ replace the corresponding solenoid valve, Impurities enter the solenoid valve core or moving iron core → for cleaning, Spring life has reached the end of → or deformation replaced, The throttle balance hole is blocked→ cleaned in time, The working frequency is too high or the life has reached → to change the product or update the product. 3. Other situations of solenoid valves Internal leakage→ check whether the seal is damaged, whether the spring is poorly assembled, External leakage→ loose connection or broken seal→ tighten the screw or replace the seal, There is noise when the power is on→ the sturdy parts on the head are loose and tightened. Voltage fluctuations are not within the allowable range, adjust the voltage. Impurities or unevenness of the iron core suction surface, clean in time.