1. Definition and characteristics of diaphragm valves. A diaphragm valve is a special type of valve whose opening and closing component is an elastic diaphragm. It uses the movement of the diaphragm to control the on-off of fluid, featuring no leakage, quick response, and low operating torque. Diaphragm valves are particularly suitable for occasions where…
Oxygen valves are key components for controlling the flow of oxygen. Their application and installation are extremely important and must strictly comply with safety regulations, because oxygen is highly oxidizing and can easily cause fires or explosions under high pressure or when in contact with grease or combustible substances. I. Main Applications of the Oxygen…
Common valve materials table. The following table shows the composition, standard, application, and temperature of verious common valve materials, which can help us to seize a quick understanding of different valve materials. Material Composition Standard Application Temperature Range WCB Carbon Steel ASTM A216 Non-corrosive media (water, oil, gas) -30℃ to +425℃ LCB Low-Temperature Carbon Steel…
I. What is a V ball valve? The V-ball valve is a specially designed valve belonging to the fixed ball valve family, named for its unique V-port ball and seat design. The V ball valve integrates advantages such as simple structure, tight sealing, wide adjustment range, and long service life. It demonstrates excellent performance under both large and small…
Resilient seat gate valve (also known as soft seat gate valve or elastic seat gate valve) is a valve widely used in pipeline systems such as water supply, drainage, and fire protection. The valve consists of a valve seat, valve cover, gate plate, gland, valve stem, handwheel, sealing gasket, and hexagon socket bolts. Both the…
The types of valves involved in the petrochemical industry mainly include gate valves, globe valves, check valves, ball valves, plug valves, and butterfly valves. The standards related to valves are mainly included in two major systems: API (American Petroleum Institute) and ASME(American Society of Mechanical Engineers). The commonly used standards are as follows: API SPEC…
What is a cryogenic valve? A cryogenic valve is designed for media with temperatures ranging from -40°C to -196°C. It is primarily used in ethylene plants, LNG liquefaction facilities, LPG/LNG storage tanks and terminals, air separation units, petrochemical tail gas separation equipment, cryogenic storage tanks and tankers for liquid oxygen/nitrogen/argon/carbon dioxide, pressure swing adsorption oxygen…
In industrial fluid control systems, butterfly valves are widely used in petroleum, chemical, power, metallurgy, water treatment and other fields due to their simple structure, small size, light weight, easy operation and low flow resistance. According to the difference in the connection mode between the valve stem and the disc, butterfly valves are mainly divided…
SDV shutdown valve (SDV) also known as the emergency shutdown valve, ESV, ESD, or ESDV, is a critical safety device in process systems. In the event of an emergency such as leaks, overpressure, fires, etc., it receives signals from the central control system, activates promptly to cut off the hazard source, prevents the escalation of accidents,…
High-pressure hydrogenation gate valves are used to control the flow and pressure of hydrogen in hydrocracking and hydrofining processes. During production, high-pressure hydrogen reacts chemically with feedstock oil to improve the quality and yield of oil products. The stable performance of high-pressure hydrogenation gate valves ensures the stable transportation of high-pressure hydrogen, which in turn…
Ⅰ.Classification of plug valves. A plug valve opens and closes by rotating a plug around the axis inside the valve body’s central cavity. In pipelines, it is primarily used to cut off, distribute, and change the flow direction of media. An important characteristic of plug valves is their easy adaptation to multi-channel structures, allowing a…
What is a vacuum valve? A vacuum valve is a component in a vacuum system used to change the direction of gas flow, regulate gas flow rate, or cut off/connect pipelines. The closing member of a vacuum valve is sealed with a rubber or metal gasket. Valve seal is critical for vacuum valves: while materials…
Natural gas ball valves control the flow of gas, playing a crucial role in industrial pipeline systems, . However, internal leakage in ball valves occurs occasionally, which not only causes waste of resources but also poses potential safety hazards. So, how should internal leakage in natural gas ball valves be handled? Ⅰ. Hazards come from…
Ⅰ.What is a balancing valve? A balancing valve is a valve with special functions. In some industries, due to a large pressure difference or flow difference of the medium (various flowable media, such as gases, liquids, etc.) in different parts of the pipeline or container, in order to reduce or balance this difference, a valve…
What is a well pump check valve? A water well pump check valve is a one way valve used to prevent the backflow of water, mainly installed at the outlet of the water well pump. Its main function is to ensure that water can only flow in one direction and prevent water from flowing back…
Ⅰ.What is a swing check valve? The swing check valve is an automatic valve that realizes one-way flow control through the rotation of the valve disc around a pin. It is widely used in fields such as petroleum, chemical engineering, power, and water treatment. The following is a detailed analysis of its operation principle, structures,…
What is the function of the air compressor check valves? The compressor check valve is a kind of one way valve that prevents the reverse flow of gas.Its main function is to prevent the gas from flowing backward after the compressor stops operating, and thus avoid causing damage to the components of the compressor so…
Among the pipeline connection methods, socket weld(abbreviated as SW) and butt weld(abbreviated as BW) are two common connection methods by welding. Socket welding or butt welding each has its own characteristics and suitable for different scenarios. What is socket welding? Socket welding only requires inserting one pipe into the connecting end of another pipe, and…
How is the service duration of the normal valve packing ? In valve design or usage experience, the packing of rising and falling valves is mostly asbestos packing, graphite packing or polytetrafluoroethylene V-shaped packing. However, these types of packing are restricted by the number of times the valve is opened and closed. That is, as…
Knife gate valve, also known as a knife-type gate valve, slurry valve, or mud valve, is a type of valve that uses a gate as its opening/closing component. Its core design feature lies in the blade-shaped gate, which can vertically cut through the medium, making it particularly suitable for handling fibrous, granular, or high-viscosity fluids….
Sewage lift devices are mainly used for the collection and lifting of sewage in buildings. The composition of sewage in buildings is relatively complex: feces, toilet paper, various kitchen wastes, etc., are all mixed in it. These wastes are discharged into municipal pipelines through the sewage pump of the sewage lift device. Each sewage lift…
As a common type of valve, the lug style butterfly valve has several remarkable features, which make it widely applied in industrial pipeline systems. What is a lug type butterfly valve? The lug butterfly valve is a type of butterfly valve featuring lugs (e.g. threaded inserts) that enable connection to pipeline flanges via bolts. The valve body’s…
Jockey Pump Foot Valv In a fire protection system, a jockey pump foot valve plays a crucial yet often under-the-radar role. To understand its significance, we need to first look at the context of the jockey pump itself. A jockey pump is an essential component within a fire protection system. Its primary function is to…
In a pipeline system, valves are basic control components. Their main functions are to isolate equipment and the pipeline system, regulate the flow rate, prevent backflow, and regulate and discharge pressure. They can be used to control the flow of various types of fluids, such as air, water, steam, various corrosive media, slurries, oils, liquid…