The pressure reducing valve is a valve that reduces the inlet pressure to a certain required outlet pressure through adjustment and relies on the energy of the medium itself to keep the outlet pressure automatically stable. From the point of view of fluid mechanics, the pressure reducing valve is a throttling element whose local resistance can be changed. That is, by changing the throttling area, the flow velocity and the kinetic energy of the fluid are changed, resulting in different pressure losses, so as to achieve the purpose of decompression. Then rely on the adjustment of the control and regulation system to balance the fluctuation of the post-valve pressure with the spring force so that the post-valve pressure remains constant within a certain error range. Principle of pressure reducing valve: Working principle: The pressure reducing valve is to reduce the water pressure by the local resistance of the flow channel in the valve to the water flow, and the range of the water pressure drop is automatically adjusted by the film connected to the valve disc or the water pressure difference between the inlet and outlet on both sides of the piston. The principle of fixed ratio decompression is to use...
What is a diaphragm valve? Diaphragm valve is a new type of valve, which is a special isolation valve. Its opening and closing part is a diaphragm made of soft material, separating the valve body’s inner cavity from the valve cover’s inner cavity and the driving parts. It is widely used in various fields. Commonly used diaphragm valves include rubber-lined diaphragm valves, fluorine-lined diaphragm valves, non-rubber-lined diaphragm valves, and plastic diaphragm valves. The diaphragm valve uses a corrosion-resistant lined body and a corrosion-resistant diaphragm instead of the spool element and is regulated by diaphragm movement. The diaphragm valve body is made of cast iron, cast steel, or cast steel, lined with various corrosion-resistant or wear-resistant materials. The diaphragm material is rubber and polytetrafluoroethylene. The lining film has strong corrosion resistance and is suitable for stabilizing strong corrosive media such as strong acids and alkalis. Advantages of the diaphragm valve: 1. Compared with other valves of the same specification, this diaphragm valve has the advantages of a simple structure, small fluid resistance, and large flow rate; 2. It is suitable for corrosive, viscous, and slurry media. 3. The valve is easy to disassemble and repair quickly, and the replacement of the...
What is a cryogenic ball valve? A cryogenic ball valve is a type of valve designed to function in extremely low-temperature environments, typically below -150°C (-238°F), using liquid nitrogen or other cryogenic fluids. It is made of special materials that can withstand extreme cold without becoming brittle or losing their strength. The valve has a ball-shaped disc that rotates to control the flow of the cryogenic fluid. It is commonly used in chemical, pharmaceutical, and energy industries to transfer or store liquefied gases. But there are many factors affecting the sealing performance of cryogenic ball valves. Do you know them all? Factors affecting the sealing performance of cryogenic ball valves 1. Sealing material Under low-temperature conditions, the deformation of the sealing material should be considered. As the temperature decreases, the metal material will shrink and deform, resulting in a gap at the seal and a decrease in the specific pressure of the seal, thereby affecting the sealing performance. Therefore, when designing the sealing structure, choosing a reasonable sealing material is necessary to ensure the sealing. Under the LNG working condition, the soft sealing method combining metal and non-metal materials is mostly used so that, on the one hand, it can...
Why are more and more customers choosing knife gate valves? Knife gate valve has the advantages of simple and compact structure, reasonable design, light material saving, reliable sealing, light and flexible operation, small size, smooth channel, small flow resistance, light weight, easy installation, and disassembly, etc. It can be used at working pressure 1.0MPa ~ 2.5MPa, working normally at the operating temperature of -29°C ~ 550°C. The gate of the knife gate valve has a shearing function, which can scrape off the sticky matter on the sealing surface and automatically remove debris. The stainless steel gate can prevent seal leakage caused by corrosion. A knife gate valve is a type of valve used to control fluid or gas flow. It is called a knife gate valve because it has a sharp-edged blade that is used to cut through the fluid or gas as it passes through the valve. The blade is typically made of stainless steel or other hard materials that can withstand the pressure and abrasion of the fluid or gas passing through. The valve is commonly used in industries such as mining, pulp and paper, wastewater treatment, and chemical processing. It is often used to control the flow...
What is a slab gate valve? A slab gate valve is a type of gate valve used to control fluid flow through a pipeline. It is called a ‘slab’ gate because its construction consists of a flat plate or slab that slides in and out of the flow path within the valve. The flat plate is called the ‘gate,’ and it serves as the primary component that prevents or allows fluid flow in a pipeline. A slab gate valve typically has two seats mounted on opposite sides of the valve body, which the gate slides between to either block or permit fluid flow. The valve’s gate is driven by a stem which can be turned manually or operated by a motor or actuator, making it possible to open or close the valve remotely. Slab gate valves are used widely in oil and gas industries to regulate the flow of hydrocarbons in pipelines and other flow control applications. The slab gate valve is a sliding valve whose closing parts are parallel gates. The closing part can be a single or double ram with a stretching mechanism in between. Fully enclosed structure, good protection performance, can adapt to all-weather requirements. Applications of...
Introduction: A resilient seat seal gate valve is also called a lift stem gate valve. A resilient seat valve is a type of gate valve, which uses a flexible rubber seat to seal the valve. Resilient seat valves are used in high-pressure applications and are also called rubber-faced valves. Resilient seat seal gates have a metal disc that opens and closes the flow path by using the force of a spring. The spring exerts pressure on the disc until it contacts the rubber seal. The spring is mounted on top of the disc and pushes down on it when required. When there is no pressure, the spring will push up against its stop. This type of seal uses a resilient material as a seal instead of packing or gaskets. Resilient materials are usually elastomers such as natural or synthetic rubber or plastic materials like nylon or polyethylene. They are designed to be soft enough to compress when pressure is applied but tough enough not to deform permanently from normal operating pressures. Resilient seat seals are commonly used in industrial settings where high pressures are present. They are not ideal for applications where there may be more than one opening in...
What is a check valve? Check valves are a type of valve that make sure water flows only one way through a pipe. The main purpose of the check valve is to prevent backflow, which can occur when the water pressure inside a pipe is greater than the pressure in the surrounding area. A check valve is a type of valve that allows fluid to flow in only one direction. The valve closes automatically to prevent backflow or reverse flow when the fluid in the pipeline changes direction or stops flowing. Check valves are designed to operate without human intervention, relying mainly on the back pressure of the fluid to close the valve. Check valves are commonly used in applications where backflow or reverse flow can lead to contamination of the fluid, damage to the equipment, loss of product, or safety hazards. Examples of check valve applications include water and wastewater treatment systems, HVAC systems, oil and gas processing, and chemical processing. There are different types of check valves, including swing, lift, ball, and diaphragm check valves. Each type is designed for specific applications depending on the fluid properties, pressure, temperature, and flow rate. Application of check valve Check...
There are many types of globe valves, and there are many ways to classify them. According to the sealing material, globe valves can be divided into two categories: soft seal globe valves and metal hard seal globe valves; according to the structural form of the valve flap can be divided into two categories: balanced globe valves and non-balanced globe valves; according to the form of the flow channel can be divided into DC channel, Z-shaped flow channel, annular flow channel, DC flow channel and three-way flow channel, etc. 1. Soft seal globe valve In the globe valve, in order to prevent the soft seal from heat damage, a heat sink is installed in front of the soft seal, which is composed of a metal sheet with a large heat sink surface. This design is not sufficient to prevent the soft seal from catching fire and burning if used in oxygen service and to prevent failure of this type of valve it is necessary to enlarge the inlet passage beyond the seat so that a pocket is formed at one end of the inlet passage so that the high-temperature gas collects away from the seal. When designing soft sealing surfaces,...
Why is it necessary to install and set up an air vent in a water supply pipe? Air venting valves are essential for pipelines as they are used to quickly remove gas from the pipeline, to improve the efficiency of water conveyance equipment and to protect the pipeline from deformation and rupture. It is installed at the outlet of the pump or in the water distribution line to remove a large amount of air from the pipe to improve the efficiency of the water pipe and pumping machine, and in case of negative pressure in the pipe, the valve can quickly suck in air to keep the line damaged by negative pressure. When the pump stops working, negative pressure will be generated at any time and the float will drop at any time to ensure the safety of the pipeline by sucking in a large amount of air. When the air is discharged, the float pulls down one end of the lever due to gravity, when the lever is in a tilted state, a gap appears in the contact part of the lever and the air discharge hole. The air is discharged through this gap by the...
1. Forged steel open stem gate valve ①Flow path: GB/T 28776-2012, JB/T 7746- 2006, API602- -2015 reduced type; EN ISO 15761 :2002 Class150~Class800 through type or reduced type, Class1500 through type; JPI-7S-36 through type ②Connection of the valve body and cover: JB/T 7746- -2006, API 602-2015 flange, threaded or welded; EN ISO 15761: 2002 flange, welded; JPI-7S-36 upper threaded stem, flange, lower threaded stem, threaded ③Connecting end: JB/T 77462006, API602-2015, female thread, socket weld or flange; EN ISO 15761:2002 female thread socket weld, flange, butt weld; JPI-7S-36 female thread, socket weld ④Gate: wedge type single gate 2. Forged steel concealed stem gate valve ①Flow channel: GB/T 28776-2012, JB/T 7746—2006, API602-2015 Reducing type: EN ISO15761:2002 Class150~Class800 Through bore type or reduced type; Class1500 through bore type: JPI-7S-36 through bore type ②Connection of the valve body and cover: JB/T 7746-2006, API 602-2015 flange, threaded or welded; EN ISO 15761:2002 flange, welded; JPI-7S-36 upper threaded stem, flange, lower threaded stem, threaded ③Connecting end: JB/T 7746-2006, API 602-2015 female thread, socket weld or flange: EN ISO15761:2002 female thread socket weld flange, butt weld; JPI-7S-36 female thread, socket weld ④Gate plate: wedge type single gate plate 3. Wedge type double gate valve ①Flow...
