Duck billed valve (check valve), also known as rubber check valve, flexible check valve, etc., is a type of rubber check valve without movable components except for connecting flanges and clamps. It is mainly used for the outlet of urban rainwater discharged into rivers, lakes, and seas to prevent backflow of water when the water level in rivers, lakes, and seas is higher than the drainage pipeline. The duckbill valve is made of elastic chloroprene rubber and artificial fibers through special processing, with a shape similar to a duckbill and two types: rolled edge and flat mouth. The working principle of the duckbill valve is based on the principle of fluid dynamics. When the liquid passes through the valve, pressure is generated, and the duckbill valve will automatically open. When the flow pressure increases, the opening amplitude of the outlet of the duckbill valve will increase accordingly. When the water flow stops or the water level of rivers, lakes, and seas is higher than the outlet to form backflow pressure, the specific structural form of the duckbill valve will cause the duckbill valve to return to its original closed state, preventing liquid or odor from flowing back. The opening pressure of the duckbill valve produced by Shanghai Meiyan Yi Pump Valve is relatively small. Usually, when the forward and reverse water level difference exceeds 10mm, the valve outlet can be opened or closed with minimal head loss.

The discharge valve is mainly used at the bottom of reaction vessels, storage tanks, and other containers for discharge, sampling, and dead zone shut-off operations. There are two types of discharge valves: upward expansion and downward expansion. When the handwheel rotates clockwise, the valve closes and the valve stem moves upward. This valve is of the upward expansion type. When the handwheel rotates clockwise, the valve closes and the valve stem rotates downward. This valve is of the downward expansion type. The upward sliding discharge valve opens the valve by moving the valve disc upwards. When opening, the valve needs to overcome the gravitational force of the medium, and the opening torque is greater than the closing torque. The downward sliding discharge valve opens by moving the valve disc (plunger) downwards, and the opening direction is the same as the medium force, so the opening torque is smaller than the closing torque. The main feature of the discharge valve produced by Shanghai Meiyanyi Pump Valve is that it is welded to the bottom of storage tanks and other containers with the help of a flange at the bottom of the valve, eliminating the residual phenomenon of process media at the outlet of the container. The valve body is usually V-shaped and provides two working modes of valve disc: lifting and lowering.

Fluorine lined valve is a type of lined valve, mainly referring to the valve body lined with PTFE material (fluoroplastic), which means that PTFE resin (or profiles processed) is pressed (or embedded) on the inner wall of steel or iron valve pressure parts or the outer surface of valve internals. The fluorine lined valves produced by Shanghai Meiyan Yi Pump Valve have improved their process structure and are particularly suitable for pipeline equipment with various concentrations of sulfuric acid, hydrochloric acid, hydrofluoric acid, aqua regia, various organic acids, strong acids, strong oxidants, and other highly corrosive media. The fluorine lined valve products include fluorine lined butterfly valves, fluorine lined ball valves, fluorine lined globe valves, fluorine lined diaphragm valves, fluorine lined gate valves, fluorine lined plug valves, etc., which are widely used in various industrial process engineering process pipelines with strong corrosion resistance requirements.

Power station valves, also known as power station specific valves, are mainly suitable for high-temperature and high-pressure system pipelines in thermal power plants, used to cut off or connect pipeline media or regulate the function. The power station valves produced by Shanghai Meiyan Yi Pump Valve are mainly suitable for non corrosive media such as oil and steam, with a working temperature of ≤ 540 ℃ (of which P57170V has a working temperature of 570 ℃). Compared with other valve products, the main characteristics of power station valves are high temperature and high pressure, as well as a unique self sealing design. The higher the pressure, the more reliable the seal. Due to the performance, technical characteristics, and special working conditions of power station valves, this series of products has also formed characteristics that cannot be replaced by other products. The valve body branch pipes of general power station valves are welded at both ends, suitable for nominal pressures of PN16.0-32.0MPa. The sealing surface of the valve seat and disc is made of cobalt based hard alloy overlay welding or plasma spray welding, which has good high temperature resistance, wear resistance, and abrasion resistance. The valve stem is generally treated with corrosion-resistant nitriding, which has good corrosion resistance and abrasion resistance.

Titanium, nickel, zirconium, and Monel alloy valves refer to different materials of valves. Specifically, titanium alloy valve materials perform well in many corrosive environments, especially in environments such as seawater and wet chlorine gas, and can maintain good mechanical properties at high temperatures. The specific strength (strength to density ratio) of titanium alloy is very high, and under the same strength requirements, the weight of titanium alloy is lighter; The material of nickel alloy valves has super strong mechanical strength and corrosion resistance in high temperature environments, and is commonly used in high temperature environments above 540 ℃. Nickel alloy Alloy800HT valves perform well in high-temperature valves in industries such as petroleum, chemical, and power, especially maintaining mechanical properties at 1100 ℃. Nickel 201 nickel alloy is widely used in aviation, aerospace, energy, and other fields due to its excellent mechanical and high-temperature properties; The raw material for zirconium alloy valves is a solid solution of zirconium or other metals. Zirconium has a very low thermal neutron absorption cross section, high hardness, ductility, and corrosion resistance. The main use of zirconium alloy valves is in the field of nuclear technology. The typical composition of nuclear grade zirconium alloys is over 95% zirconium and less than 2% tin, niobium, iron, chromium, nickel, and other metals, which are added to improve mechanical properties and corrosion resistance; The raw materials of Monel alloy valves are mainly composed of nickel and copper, with nickel content typically ranging from 63% to 67% and copper content ranging from 28% to 34%. Containing small amounts of iron, manganese, silicon and other elements, this alloy is a high-strength single-phase solid solution with excellent corrosion resistance and mechanical properties. Monel alloy valves perform well in various corrosive environments, especially in seawater, hydrofluoric acid, sulfuric acid, hydrochloric acid and other environments.

Bellows valve refers to the effective barrier between the overcurrent part of the valve and the outside of the valve body or valve stem in the structural design of the valve, preventing sealing leakage caused by the valve stem or other components during operation. Bellows are the core component of bellows valves, usually made of stainless steel. The inner cavity of the bellows is connected to the inner cavity of the valve body, and the outer shell of the bellows is usually U-shaped. This design can effectively prevent the medium from leaking out along the valve stem, improve the sealing performance of the valve, and is particularly suitable for situations where high temperature, high pressure, or toxic and harmful media require strict sealing of the valve stem, such as in high vacuum applications and the nuclear industry. The bellows valve produced by Shanghai Meiyanyi Pump Valve uses bellows as the valve stem sealing element. In application, bellows are used instead of the packing box on ordinary valves. Through automatic rolling welding technology, the lower end of the bellows is generally welded to the valve stem to form a metal barrier between the fluid medium and the atmosphere, ensuring zero leakage design of the valve stem.

Fire valves are important valves used to control firefighting water on fire pipelines in large buildings with fire protection requirements such as buildings, factories, and shopping malls. The fire valves produced by Shanghai Meiyan Yi Pump Valve consist of four main parts: valve body, opening and closing mechanism, valve cover, and signal transmission. In terms of structural form, they can be divided into: fire signal butterfly valve, fire special rising stem elastic seat seal gate valve, fire wet alarm valve, fire sprinkler alarm valve, fire sprinkler valve, fire exhaust valve, water mist fire extinguishing system special sprinkler control valve, etc. The products can be opened and closed quickly and reliably, so they are often used in firefighting systems and play a crucial role in ensuring that the firefighting water in the fire pipeline can be quickly cut off or opened in case of a fire, so as to maintain the firefighting water supply in the firefighting pipeline. Smooth flow, protect personnel and property safety.

Glasses valve, also known as fan-shaped glasses valve, fan-shaped blind plate valve, flap valve, fan-shaped valve, is a new generation product independently developed by China based on the relevant standards of GB6222 "Safety Regulations for Industrial Enterprise Gas" and the digestion and absorption of advanced technologies at home and abroad. Widely used in gas medium management systems for industrial and mining enterprises, municipal, environmental protection and other industries, especially suitable for absolute cut-off of harmful, toxic and flammable gases. It is also suitable for making blind flanges at pipeline terminals to shorten maintenance time or facilitate the connection of new pipeline systems. Eyewear valves are generally divided into electric blind valves, hydraulic blind valves, closed plug valves, and electric open blind valves. Its structure usually includes left and right valve bodies, a telescopic mechanism, a fan-shaped valve plate, and a first electric push rod for driving the valve plate, as well as a second electric push rod for clamping and releasing. The working principle is that when it is necessary to cut off the gas in the pipeline, the clamping mechanism is first released, and the hydraulic deformation device drives the valve plate to move, achieving the switching action between the through hole and blind hole on the valve plate. After the conversion is in place, the hydraulic clamping mechanism operates to tightly connect the valve plate with the valve body, effectively cutting off the gas.

Insulated valve refers to a jacket between the valve body and the atmosphere, which serves as a flow space for the insulation medium. It continuously heats, cools, or maintains a constant temperature of the insulation medium (usually steam, oil, water, etc.) to ensure the temperature setting of the fluid part inside the valve, effectively reducing the heat loss of the medium in the pipeline or extending the service life of the medium, improving production efficiency and product quality. There are many types of insulated valves produced by Shanghai Meiyanyi Pump Valve, including packaged gate valves. Universal valves such as globe valves and check valves can be made into insulated valves, which are particularly suitable for systems such as petroleum, chemical, metallurgical, pharmaceutical, etc. Insulated valves can effectively reduce the heat loss of the medium in the pipeline, prevent the crystallization or solidification of the medium, and ensure the normal operation of the system.

Discharge valve refers to a valve specifically used for the discharge of various pipeline equipment. Discharge valve is a valve device evolved from gate, mainly used on pipelines of water supply and drainage, building fire protection and other systems, or to discharge scale and sludge accumulated in boilers. When the boiler is full of water or shut down for cleaning, residual water is discharged. In addition, discharge valve is also suitable for regular discharge of high-pressure boilers. The drain valve uses a gear rotation of 90 degrees to drive the valve stem to lift and open and close, making it easy to operate and achieve rapid opening and closing. The sewage valve is mainly composed of components such as valve body, valve, spring, and operating rod. The discharge valve body produced by Shanghai Meiyan Yipump Valve is usually made of materials such as cast iron, ductile iron, cast steel, and stainless steel, and is coated with anti-corrosion paint to ensure its service life and anti-corrosion performance in harsh environments. The valve adopts a spherical or cylindrical design, and can be opened or closed by rotating or pulling the operating rod, thereby achieving the function of discharge or shut-off.