A swing check valve is a check valve in which the valve disc rotates around the rocker shaft in the body cavity. The opening and closing principle of a swing check valve is the same as that of a lift check valve, which also relies on the action of fluid pressure and the self weight of the valve disc to act on its own. The difference is that the opening and closing method of the valve disc is rotational motion rather than upward and downward movement, and the inlet direction of the fluid should be on the side that can impact the rotation of the valve disc. The closing component of a swing check valve is a valve disc or disc that is equivalent to the diameter of the pipeline, suspended inside the valve chamber. When the fluid flows forward, the valve disc opens under the action of fluid pressure, and when the pressure drops, the valve disc closes under the action of its own weight and the pressure of the countercurrent fluid. A swing check valve consists of a valve body, valve cover, valve disc, and rocker. The valve disc is in a circular shape and rotates around the pin axis outside the valve seat channel. The internal channel of the valve is streamlined, and the flow resistance is smaller than that of the straight through lifting check valve, making it suitable for large-diameter pipelines. But at low pressure, its sealing performance is not as good as the lift check valve. To improve sealing performance, auxiliary springs or heavy hammer structures can be used to assist sealing. Due to the weight of the valve disc, when a swing check valve opens, there is relatively greater resistance to the fluid. In addition, due to the valve disc being suspended in the fluid, it can cause turbulence in the fluid. This also indicates that the fluid pressure drop through swing check valves is greater than that through other forms of check valves. When the flow direction suddenly changes, the valve disc will fiercely close on the valve seat, causing significant wear on the valve seat and generating water hammer along the pipeline. To overcome this problem, a damping device can be installed on the valve disc and a metal seat can be used to reduce seat wear. According to the number of valve discs, swing check valves can be divided into three types: single disc, double disc, and multi disc. 1. Single disc type has only one seat channel and one disc, suitable for medium caliber swing check valves. 2. The double disc type has two valve discs and two seat channels, suitable for larger diameter swing check valves. 3. For large-diameter check valves, if a single disc structure is used, significant hydraulic impact will inevitably occur when the medium flows in the opposite direction, and even damage to the sealing surfaces of the valve disc and valve seat will be caused. Therefore, a multi disc structure is adopted. Its opening and closing components are composed of many small diameter valve discs. When the medium stops flowing or flows back, these small valve discs wil...

As a component used to achieve on/off and flow control in pipeline systems, electric butterfly valves are becoming increasingly popular in practical applications due to their excellent quality and performance! Electric butterfly valves can generally be divided into the most common types of electric clamp butterfly valves and electric flange butterfly valves according to their different connection methods. There are two types of sealing materials: soft sealing (normal temperature and pressure) and hard sealing (high temperature and high pressure). Working Principle Electric butterfly valves use electricity as the driving force. After adjusting the connection between the electric actuator and the valve stem and adjusting the electric butterfly valve, the electric seal is used as the driving force to drive the 0-90 ° rotation movement of the hard sealed butterfly valve plate. The electric butterfly valve receives 4-20mA industrial automation control system signals to accurately control the valve opening, thereby achieving the adjustment and control of different process parameters such as flow rate, temperature, and pressure. Installation Precautions (1) Electric butterfly valves should be installed vertically on horizontal pipelines. If there is a need for horizontally inclined equipment in special circumstances, support should generally be added. (2) The equipment location should have good environmental conditions, and the ambient temperature should be between -25 to +55 ℃. (3) Try to prevent equipment from being exposed to vibration sources, otherwise necessary anti vibration reinforcement measures should be taken. (4) When installing equipment, it is necessary to point the arrow direction on the valve body or flange towards the direction of the medium. (5) Before installing the equipment, it is necessary to carefully remove welding slag and other debris inside the pipeline. After installing the equipment, the valve core should be at a larger opening and the pipeline and butterfly valve should be cleaned again to prevent debris from getting stuck and damaging the saving parts. (6) Electric butterfly valves should be located in a position that is easy to maintain and repair. (7) The straight pipe section in front of the valve should be as long as possible. (8) Export piping should use straight pipe sections with a diameter of 3-5 times the pipeline diameter.

1. Leakage at the packing of butterfly valve Faults: (1) The filler has exceeded its usage period and has aged. (2) Excessive force during operation. (3) The live bolt is not tightened. Solutions: (1) Aging or damaged fillers should be replaced in a timely manner. (2) It should be operated uniformly with normal force, and no casing or other methods should be added. (3) Evenly tighten the bolts that hold down the packing. 2. Leakage at sealing surface of butterfly valve Faults: (1) The installation direction of the valve does not match the flow direction of the medium. (2) The butterfly valve does not close properly. (3) The butterfly valve that has been closed for a long time has accumulated scale on the sealing surface. (4) The sealing surface is severely damaged. Solutions: (1) Pay attention to installation inspection and ensure that it is tightly closed in place. (2) Open a gap in the valve and allow the high-speed fluid to flush away any dirt on the seal. (3) Re grind and thicken the adjusting gasket for compensation. 3. Leakage at the flange connection of butterfly valve Faults: (1) Uneven tightening force of bolts. (2) Aging and damage of gaskets. (3) The material used for the gasket does not meet the requirements of the working medium. Solutions: (1) Tighten the bolts evenly again. (2) Replace the gasket in a timely manner. (3) Select gasket materials and forms correctly according to the requirements of the working conditions. 4. Damaged at handle and handwheel of butterfly valve Faults: (1) Incorrect use. (2) Loose fasteners. (3) Damage to the connection between the handle, handwheel, and valve stem. Solutions: (1) Prohibit the use of pipe pliers, long levers, impact tools, etc. (2) Repair and repair at any time. 5. Jamming at worm gear drive of butterfly valve Faults: (1) Unclean embedded dirt, affecting lubrication. (2) Poor operation. Solutions: (1) Please keep it clean and refuel regularly. (2) If a bite is found during operation and there is significant resistance, the operation cannot continue, otherwise the damage will worsen. 6. Electric installation fault of butterfly valve Faults: (1) Poor lubrication, foreign objects stuck inside the valve causing excessive torque. (2) Motor malfunction. Solutions: (1) Oil should be added and kept clean to ensure that the oil pipe is in good condition, the packing is moderately compressed, and foreign objects are promptly removed. (2) The working time of the motor should not exceed 15 minutes, and the power supply should be normal. It should be avoided to touch and get damp.

With the continuous development of global industrialization, the safety requirements for equipment and pipeline systems are also increasing. Line blind valves have always played a crucial role in the safety and reliability of industrial facilities. Line blind valve has been widely used in various fields such as petrochemical, energy production, and chemical engineering. It provides more flexibility and safety for engineers and operators in various industries, helping to reduce maintenance costs and improve production efficiency. Adaptable Design In addition to its conventional design, the THD-Slide is available in variations tailored for High-Temperature, Fire Safety, and Non-Drip applications. For installations constrained by limited space, a compact version can be provided as well. Easy Seal Inspection In this design, the seals are housed within the spectacle plate. This characteristic offers the advantage of convenient access for inspection and seal replacement. Assessing the condition of these seals can be performed external to the operational process, prior to any position changes, thereby ensuring the integrity of the seal's quality. Cost Effectiveness The THD-Slide features a straightforward and robust design engineered to deliver complete shutdown, extended operational lifespan, and cost-effective service with minimal maintenance requirements. The distinctive mechanism for opening and closing the THD-Slide enables a single individual to rapidly and safely blind pipelines without the need for any tools or equipment. Mechanism Principle In normal conditions, the blind valve's diversion hole is in contact with the pipeline, and the blind valve is in the open position. When maintenance is required, and the pipeline must be cut off, then loosen the stem of blind valve to move the flat end onto the pipeline, and make the blind valve turn to closed position from open position; tighten the stem and let the blind valve to perform sealing function and cut off the pipeline. When the maintenance work is completed, loosen the stem and move the blind plate to the diversion hole and connected to the pipeline. The blind valve was turned to closed position from open one. Lock the stem, and seal it, the pipeline is now open, and the blind plate valve returns to the open position.

Three-way ball valves are mainly used in pipelines to cut off, distribute, and change the flow direction of the medium. Three-way ball valve is a relatively new type of ball valve, which has some unique advantages of its own structure, such as no friction on the switch, less wear on the seal, and small opening and closing torque. This can reduce the specifications of the equipped actuator. Three-way ball valves are available in T and L shapes. The T-shape can connect three orthogonal pipelines and cut off the third channel, playing a role of diversion and confluence. The L-type three-way ball valve type can only connect two orthogonal pipelines and cannot maintain the interconnection of the third pipeline at the same time, only serving as a distribution function. The working principle of a three-way ball valve is to rotate the valve core to make the valve unobstructed or blocked. Ball valves have the advantages of lightweight opening and closing, reliable sealing, simple structure, and convenient maintenance. Its small size allows it to be made into a large caliber. The sealing surface and spherical surface of ball valves are often in a closed state and are not easily eroded by media, making them widely used in various industries. 1. The three-way ball valve is easy to switch on the pipeline and has stable and reliable performance. 2. The three-way ball valve has a long service life, high flow capacity, and low resistance. 3. The selection of three-way ball valves should be based on the diversion requirements of the pipeline and should not be confused with each other.

The proper installation of the drain valve has a direct impact on the normal operation of the drain valve and the production efficiency of the equipment. The installation of the drain valve must follow the installation requirements of the drain valve in order to achieve better work efficiency for the drain valve and equipment. 1. Before installing the drain valve, it is necessary to use pressurized steam to purge the pipeline and remove any debris. 2. Before the drain valve, a filter should be installed to ensure that the drain valve is not blocked by pipeline debris, and the filter should be cleaned regularly. 3. Valves should be installed before and after the drain valve to facilitate its maintenance at any time. 4. The direction of condensate flow should be consistent with the arrow mark on the installation of the drain valve. 5. The drain valve should be installed at the lowest point of the equipment outlet to timely discharge condensate and avoid steam resistance in the pipeline. 6. If there is no drain valve installed at the lowest position of the equipment, a backflow bend (condensate lifting joint) should be added at the lowest position of the water outlet to raise the condensate level before installing a drain valve to avoid steam resistance. 7. The outlet pipe of the drain valve should not be immersed in water (if immersed in water, a hole should be drilled at the bend to break the vacuum and prevent sand from being sucked back). 8. Mechanical traps should be installed horizontally, while steam traps should not be installed in series. 9. Each device should be equipped with its own drain valve. 10. Thermostatic type steam traps need to have over one meter of non-insulated supercooled pipes in front of them, while other types of steam traps should be located as close to the equipment as possible. 11. When using a drain valve for drum drying (with siphon type) equipment, please indicate: use a drain valve with an anti-steam resistance device to avoid steam lock on the equipment. 12. If there is condensate recovery after the drain valve, the outlet pipe of the drain valve should be connected to the main pipe from above the recovery main pipe to reduce back pressure and prevent backflow. 13. If there is condensate recovery after the drain valve, pipelines with different pressure levels should be separated for recovery. 14. The condensate recovery main pipe behind the drain valve cannot climb a slope, which will increase the back pressure of the drain valve. 15. A check valve should be installed before the condensate enters the recycling main after the drain valve to prevent the condensate from flowing back. 16. Install a drain valve on the steam pipeline, with a condensate collection well located near the radius of the main pipeline, and then use a small pipe to lead it to the drain valve. 17. If the mechanical drain valve is not used for a long time, it is necessary to remove the drain screw and drain the water inside to prevent freezing. 1...