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...
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...
valve sealing surface faults and troubleshooting methods The sealing surface is mixed with foreign matter Reason: foreign matter is easily adhered to the sealing surface that is not frequently opened or closed Method: If permitted, close or open the valve frequently, leave a slit, repeat several times, and wash off the foreign matter on the sealing surface Reason: rust on equipment and pipelines, welding slag, bolts and other objects stuck on the sealing surface Method: Before the valve, protection devices such as sewage and filtration should be installed, and the above protection devices and valve bottom plugs should be opened regularly to remove foreign matter. Reason: The medium itself has hard particles embedded in the sealing surface Method: Generally, gate valves should not be used, but ball valves, plug valves and valves with soft sealing surfaces should be used. The sealing ring is loose Reason: The sealing surface is not rolled tightly Method: It is best to apply a layer of adhesive suitable for working conditions on the rolling surface, and strictly abide by the pressure test system Reason: poor surfacing or welding connection on the sealing surface Method: Strictly implement the rules and specifications of surfacing...
The gate valve is the main component of the oil (gas) wellhead device, several gate valves in use of common failures are as follows. 1. The gate valve and gate valve joint leakage First of all, check whether the gate valve and gate valve coupling bolts are tightened, such as not tightened, the seal gasket ring and flange sealing groove surface are not fully combined with the regular meetings lead to leakage. Should check the bolts and nuts in order, and tighten all the bolts until the gasket ring is pressed. Next, the gasket ring and flange sealing groove size and accuracy should be checked, if the seal contact surface size is not correct or too rough, the gasket ring should be repaired or updated. Further, check the sealing gasket ring and flange sealing groove contact surface is not pitting, sand holes, sand eyes, or impurities, if there are such defects, it is necessary to make up the corresponding welding, repair, or clean up. 2. Valve cover leakage Valve cover leakage, this fault phenomenon is mainly manifested in the packing seal leakage. First of all, check whether the seal is selected correctly and whether it matches the sealing...
A gate valve is a valve that uses a gate and a seat to control opening and closing. Gate valve mainly has a valve body, valve seat, gate, valve stem, valve cover, stuffing box, packing gland, valve stem nut, hand wheel, and other components. Depending on the change in the relative position between the gate and the valve seat, the channel size can be changed and the channel can be cut off. In order to make the gate valve close tightly, the mating surface of the gate plate and the valve seat are ground. Types of gate valves: According to the different structural shapes of the gate valve, the gate valve can be divided into two categories: wedge type and parallel type. The gate of a wedge-type gate valve is wedge-shaped, the sealing surface and the center line of the channel into an inclined angle, using the role of the wedge between the gate and the valve seat to achieve sealing (closed). The sealing surface of the parallel gate valve is parallel to each other and perpendicular to the center line of the channel, divided into two types with and without the propping mechanism. When the gate is lowered, the...
Introduction: Gate valves are linear movable valves that use the valve disc to open and close or regulate flow in the pipeline. In general, the gate of valve gates can be divided into a wedge shape, parallel shape, V-shaped form, and so on. The wedge-shaped gate of gate valves generally has a wedge shape on both sides with high friction so it is not suitable for throttling. The parallel gate is smooth on both sides and has high friction so it cannot be throttled easily. The V-shaped gate of gate valves has smooth surfaces on both sides but does not reduce friction significantly when opening or closing the valve seat because there are still some contact points between the two surfaces that must be overcome before separating from each other. Gate valves are widely used in oil refining and chemical industry pipelines, especially suitable for high-temperature, high-pressure pipelines. A complete gate valve consists of several parts such as a valve body, valve seat, valve stem, gate plate, valve cover, seal ring, etc. The specific gate valve structure diagram is as follows: The working principle of the gate valve: The gate valve can only be fully open or fully...
The gate valve opening and closing part is the disc, the movement direction of the disc is perpendicular to the fluid direction.
Gate valve is one kind of equipment which can be widely used on oil and steam pipelines in petrochemical plant and coal-fired power plants to connect or truncate the medium in pipelines.
