Low temperature valve

　　DD673F Low temperature butterfly Valve Overview:

　　Low temperature butterfly valve is suitable for methane, liquid natural gas, alene, carbon dioxide, liquid ammonia, liquid oxygen, liquid nitrogen, liquid hydrogen and other low temperature media.

　　DD673F Low temperature butterfly valve Features:

　　1. In order to prevent abnormal pressure boost in the central cavity, pressure relief holes are arranged on the inlet side of the butterfly plate

　　2. Determine the top length of the valve cover according to the working temperature of the valve to ensure the reliable sealing of the valve stem packing

　　3, according to the working temperature reasonable selection of filler, gasket and other parts of the material

　　4, strictly control the chemical composition of the material and low temperature impact toughness and other mechanical properties

　　5, adopt a variety of pipe flange standards and sealing surface type, suitable for various engineering needs

　　The ball of low temperature ball valve is floating, under the action of medium pressure, the ball can produce a certain displacement and pressure on the sealing surface of the outlet end, to ensure that the outlet end is sealed. Floating ball valve has simple structure and good sealing, but the ball bears all the load of the working medium to the outlet sealing ring, so it is necessary to consider whether the sealing ring material can withstand the working load of the ball medium, when the ball is affected by high pressure, the ball may be offset. This structure is generally used for medium and low pressure ball valves.

　　DQ41F Low temperature ball valve performance specifications:

　　- Nominal pressure: PN1.6 ~ 6.4MPa

　　- Nominal diameter: DN15 ~ 300mm

　　- Body material: stainless steel (304/316/304L/316L) seal ring: PTFE

　　- Connection mode: flange, welding

　　- Operating temperature range: -196℃ ~ +80℃

　　- Applicable media: liquid oxygen, liquid nitrogen, liquid argon, liquefied natural gas, liquid carbon dioxide, liquid propane, etc

　　DZ11H, DZ11Y type 150(Lb)~800(Lb) forged steel low temperature gate valve: Manual, internal thread (wire) connection, wedge type single gate, DZ11H seat sealing surface material for Gr3 series stainless steel, DZ11Y seat sealing surface material for hard alloy, pressure class 150Lb~800Lb, the body is carbon steel low temperature gate valve.

　　Working principle and use of the product:

　　The opening and closing part of the high pressure globe valve is a plug shaped disc, the sealing surface is flat or conical, and the valve disc moves in a straight line along the center line of the fluid. The movement form of the valve stem, there are lifting rod type (valve stem lifting, handwheel does not lift), there are also lifting rotary rod type (handwheel and valve stem rotation lifting, nut in the valve body). Globe valve is only applicable to fully open and fully closed, do not allow for adjustment and throttling.

　　Low temperature and high pressure globe valve used in gas liquefaction equipment, air separation equipment; Natural gas liquefaction, storage and transportation equipment; Liquid oxygen, nitrogen, argon, hydrogen, carbon dioxide low temperature storage tank and tank car; Pressure swing adsorption equipment for oxygen and nitrogen production. Widely used in energy, petrochemical, metallurgy, aerospace, nuclear industry, railway and other industries.

　　Product structure features:

　　1. Simple structure, convenient manufacturing and maintenance;

　　2. Small working trip and short opening and closing time;

　　3, good sealing, small friction between the sealing surface, large life;

　　4, fluid resistance, open and close when the required force is large;

　　5, not suitable for particles, viscosity, easy to coking medium;

　　The opening and closing part of stainless steel low-temperature flange gate valve is the gate plate. The direction of the motion of the gate plate is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed, and can not be adjusted and throttled. During the manufacturing process, the parts are immersed in liquid nitrogen at low temperature -196℃ for 2 to 6 hours, and then taken out for natural treatment. The cycle is repeated twice to reduce the deformation caused by temperature difference and metallographic structure change, and improve the sealing performance of the valve at low temperature. Valves for flammable media should be designed to prevent static electricity.

　　Stainless steel low temperature flange gate valve main structural features:

　　- Fluid resistance is low, sealing surface should be eroded by media brush and erosion

　　- It's easier to open and close

　　- The flow direction of the medium is not restricted, without disturbing the flow and without reducing the pressure

　　- Simple shape, short structure length, good manufacturing process, wide range of application

　　Stainless steel low temperature flange gate valve performance specification parameters:

　　- Nominal pressure: PN1.6 ~ 10.0MPa

　　Nominal diameter: DN15 ~ 350mm

　　- Body material: stainless steel (304/316/304L/316L)

　　- Drive mode: hand wheel

　　- Operating temperature range: -200℃

　　- Applicable media: liquid chlorine, liquid ammonia, liquid nitrogen, liquefied natural gas, ethylene, propylene and other low temperature media

　　Product characteristics

　　DH61F low-temperature welded check valve is mainly used in various low-temperature media piping system to prevent media backflow. It has the characteristics of flexible switching and reliable sealing. Widely used in ethylene, liquefied natural gas and other chemical equipment, natural gas LPG LNG storage tank, receiving base and satellite station, air separation equipment, petroleum, chemical exhaust separation equipment, liquid oxygen, liquid nitrogen, liquid hydrogen, carbon dioxide low temperature storage tank and tank truck, pressure swing adsorption oxygen production pipeline system.

　　Specification parameter

　　Nominal pressure: 4.0Mpa

　　Nominal diameter: 10mm-100mm

　　Applicable media: LO2, LN2, LAr, LNG, LC2H4, etc

　　Applicable temperature: -196℃~+80℃

　　Connection type: socket welding