The Preparation of Ball Valve before Installation 1. Ensure that the pipeline at the installation position of the ball valve is in the coaxial position. The two flanges on the pipeline should be parallel, and confirm that the pipeline can bear the weight of the ball valve. 2. Check whether there are impurities and welding slag in the pipeline, and the regulating valve must purge the pipeline. 3. Check the nameplate of the ball valve, and fully open and close the ball valve for several times to confirm that the valve can work normally, and thoroughly check all the details of the valve to ensure that the valve is intact. 4. Remove the protective cover at both ends of the valve, check whether the body is clean, clean the body cavity, because the sealing surface of the ball valve is ball shape, even small debris may cause damage to the sealing surface. Installation of Ball Valve 1. Any section of the ball valve can be installed in the upstream end, Shanghai nimei ball valve handle ball valve can be installed in any position of the pipeline, if equipped with actuator (such as gear box, electric-pneumatic actuator) ball valve, it must be installed vertically, valve inlet and outlet in a horizontal position. 2. Between the ball valve flange and the pipeline flange according to the design requirements of the pipeline with sealing gasket. 3. Bolts on the flange shall be tightened symmetrically, successively and uniformly. 4. If the ball valve with pneumatic, electric and other actuators, according to the manual to complete the installation of air source, power supply. Inspection After Installation Of Ball Valve 1.After installation, start the ball valve open and close several times, should be flexible, uniform force, ball valve work normally. 2. According to the design requirements of pipeline pressure, test the sealing performance of the joint surface of ball valve and pipeline flange after passing through pressure. Ball Valve Maintenance 1. Only by removing the pressure before and after the ball valve can the ball valve be disassembled and decomposed. 2. In the decomposition and reassembly process of the ball valve, it is necessary to protect the sealed parts, especially non-metallic parts, such as o-ring and other parts, with special tools. 3. Bolts must be tightened symmetrically, step by step and evenly when the ball valve body is reassembled. 4. Cleaning agent should be compatible with rubber parts, plastic parts, metal parts and working medium (such as gas) in the ball valve.When the working medium is gas, gasoline (gb484-89) can be used to clean the metal parts.Clean nonmetallic parts with purified water or alcohol. 5. The decomposed individual parts can be cleaned by immersion washing.The metal parts that have not been decomposed can be cleaned by a clean and fine dip silk cloth with cleaning agent (to avoid fiber falling off and sticking to the parts).When cleaning, remove all the grease, dirt, glue, dust etc. 6, non-metallic parts should be imm...

Hydrogen service is a condition in which the medium contains hydrogen. Hydrogen-dependent equipment refers to the equipment containing hydrogen in the medium, including the hydrogenation reactor, the hydrogenation heat exchanger and the hydrogenation separator. Under high temperature and high pressure conditions, hydrogen is easy to produce hydrogen and hydrogen sulfide corrosion with steel equipment, resulting in steel strength reduction, or even damage to equipment It can be divided into hydrogen-dependent process and non-hydrogen-dependent process. Due to the particularity of hydrogen medium (small molecule, easy penetration, hydrogen embrittlement, explosive, etc.), high quality requirements are required for the valve body and valve cover: Forgings are preferred for body & bonnet material. Casting can be selected for large-caliber valves, but RT secondary sheet standard is required. Valve design and manufacturing can not have sharp chamfering, all chamfering needs to be smooth, parts processing accuracy and surface are very high requirements; Valves need to be cleaned strictly; During the pressure test, the strength test should be done for gas strength test, not just for water strength test. In the case of hydrogen valve, the requirements will be higher. The material of valve shall control the content of C, S and P, and conduct crystal phase test, etc. Valves with hydrogen media can also be tested with hydrogen according to SHELL 77/308 specifications. Must pay attention to fire safe, blow-out proof, and anti - static.

The jacket valve has good heat preservation and cold preservation characteristics, and the diameter of the valve is consistent with the diameter of the pipe, and at the same time, the heat loss of the medium in the pipeline can be effectively reduced. It has good thermal insulation properties and can effectively reduce the heat loss of the medium in the pipeline. Insulation valves are widely used in various systems such as petroleum, chemical, metallurgy, and pharmaceuticals, effectively reducing the loss of heat in the pipeline and preventing the appearance of crystals and solidification of the medium. The function of the heat preservation valve is that when the valve passes through the valve at a high or low temperature, the material in the heat preservation valve has a heat insulation effect on the medium, so that the medium does not condense or stick to the inside of the valve body, so that the opening and closing of the valve can operate normally.

Plug valves are commonly applied in different areas, but how to choose the right type of it?  In this article, we will introduce briefly about it. 1. Lubricated Plug Valves This type of plug valves uses a lubricant injected under pressure between plug face and body seat, in this way, it can reduce friction and seal ports. And they perform well for the fluids including abrasive particles like dirty upstream applications, gas pipeline system with bypass valves. 2. Non-Lubricated Plug Valves Non-lubricated plug valves are equipped by a sleeve for the seat part, which can reduce friction between the plug and body, it is more commonly used in applications that don’t need much maintenance like sulphur, hydrogen fluoride. However, it has limitations on temperature and pressure due to the non-metallic material of sleeve. 3. Eccentric Plug Valves There is only a half plug in eccentric plug valves, when you are needing a higher seating force with minimal friction from open to close position, you could consider eccentric plug valves.

How to maintain the valve to make it better service for us? 1. The valve should be stored in a dry and ventilated room and blocked at both ends of the access. 2. The valve installed and in use should be inspected regularly to ensure its normal operation. 3. Check whether the sealing surface of valve is worn, and repair or replace it according to the situation. 4. Check the valve stem and stem nut. If the packing is outdated, and replacement should be carried out. 5. The sealing performance of the valve shall be tested to ensure its performance. 6. The valve in operation should be in good condition, flange and bracket bolts are complete, threads are not damaged, no loosening phenomenon. 7. If the valve is used in a poor environment, vulnerable to rain, snow, dust, sand and other contaminants, it should be installed for the valve stem protective cover.

Floating ball valve The sphere of the ball valve is floating, under the action of medium pressure, the sphere can produce a certain displacement and press on the seal surface at the exit end, ensuring that the outlet seal. The structure of the floating ball valve is simple and sealed well, but the load of the ball under the working medium is passed to the outlet seal ring, so it is necessary to consider whether the sealing ring material can withstand the working load of the sphere medium, and the sphere may be offset when it is affected by higher pressure. This structure is commonly used for medium and low pressure ball valves. Trunnion Ball Valve The sphere of the ball valve is fixed and does not move after pressure. Fixed ball valves are equipped with floating seat, subject to media pressure and the seat is generated to move, so that the seal ring is pressed on the sphere to ensure the seal. Bearings are usually installed on the upper and lower shafts with spheres. Small torque for operation leads to its suitability for high pressure and large size valves. Elastic Ball Valve The sphere of the ball valve is elastic. The sphere and seat seal ring are made of metal material. This valve is suitable for high-temperature and high-pressure media. An elastic sphere is an elastic slot at the lower end of the wall inside the sphere, which obtains elasticity. When closing the channel, use the wedge head of the stem to make the sphere rise and hold to tighten to seal. Release the wedge head before turning the sphere, and the sphere reverts to its original shape, allowing for a small gap between the sphere and the seat, reducing friction and operating torque of the sealing surface. V Type Ball Valve The V-shaped regulating ball valve has a shear effect on the seat because the core has a V-shaped structure. Therefore, it is suitable for paper, chemical, metallurgy and other industrial enterprises containing fiber or tiny solid particles in the suspension fluid medium of the relevant process parameters control. V-ball valve belongs to the fixed ball valve and has a single seat. Its adjustment performance is the best ball valve. Plus, its flow characteristics are equal percentage, adjustable ratio of up to 100:1. Three-way Ball Valve The tee ball valves are T-type and L-type. The T-type can connect three orthogonal pipes to each other and cut off the third channel, which acts as a diversion and convection. The L-type can only connect two orthogonal pipes to each other, and cannot maintain the interconnection of the third pipe at the same time, only for distribution.