With the development of science and technology, the domestic valve industry, but also to the high-tech, high parameter, strong corrosion resistance, high life direction. Based on the analysis of valve technology at home and abroad and domestic and foreign valve market demand analysis, obtained in recent years the industry valves and valves of high-tech industry development trend and investment direction, as follows:

    1． Petroleum, natural gas wellhead valve

    Petroleum, natural gas wellhead device with the main valve to comply with the United States API6A standard single disc or double disc, with a flow guiding hole with or without diversion hole forged steel parallel gate valve, slurry valve, angle valve ( CHOKE valve ), pilot operated safety valve and check valve. These valves are nominal pressure level for API2000psi,3000psi,5000PSI,10000psi,15000psi,20000psi; nominal diameter is DN46~228mm (113/16in~9in ); temperature grade K ( -60~182 ℃), L ( -42~182 ℃), P ( -29~182 ℃), R ( room temperature ), S ( -18~166 ℃), T ( -18~182 ℃), U ( -18~121 ℃), V (2~121 ℃); material requirements for AA, BB, CC, DD, EE, FF, HH; material performance requirements according to 36K,45K,60K,75K; product technical requirements according to PSL1( product specification Level 1), PSL2( product specifications, grade2), PSL3( product specification Level 3), PSL4( product specification Level 4).

    2． Petroleum, natural gas pipeline valve

    Petroleum, natural gas pipeline with the main valve to meet the United States API6D standard single disc or double disc, with a flow guiding hole with or without diversion hole forged steel parallel gate; forged or cast steel body type, coat or fully welded ball valve; the oil seal or pressure balanced plug valve; rotary open type or butterfly check valve, ball check valve; pipe valve. These valves are nominal pressure level is CL150( PN2.0MPa ), CL300( PN5.0Mpa ), CL400( PN6.4MPa ), CL600( PN10.0MPa ), CL900( PN15.0MPa ), CL1500( PN25.0MPa ), CL2500( PN42.0MPa ); nominal diameter is DN50~1500mm (2in~60in ); fire test technical requirements according to ISO10497; the valve pressure test according to ISO5208.

    3． Nuclear power valve

    Nuclear power valves than conventional large thermal power station valves of its technical characteristics and requirements of high. Valve gate valve, globe valve, general check valve, butterfly valve, safety valve, the main steam isolation valve, ball valve, diaphragm valve, relief valve and control valve; representative valve top technical parameters: maximum diameter DN1200mm (nuclear grade 3valves), DN800mm ( nuclear grade 2main steam isolation valve ), DN350mm (nuclear grade 1main circuit valve ); maximum pressure: about 1500pound level; the highest temperature of about 350 DEG C; medium:: coolant ( boron water). The production of nuclear grade valve products requirements: usually in the nuclear industry standard EJ, American ASME, IEEE standards and French PWR design and construction rules for mechanical components such as RCC-M.

    Nuclear power valve development of specific types, parameters are as follows:

    ⑴ No stuffing gate valve:

    a Hydraulic gate valve. The valve by means of the water pressure to push the piston to open or closed, the valve nominal diameter: DN350, mm: PN17.5MPa400; working pressure working temperature: 315 ℃.

    b Totally enclosed type electric gate valve. The valve should adopt special screen closed motor, through water immersion to work inside a planetary reduction mechanism of the gate opened and closed. The valve nominal diameter: DN100~800mm; PN2.5~45.0MPa; job stress: operating temperature:200~500 ℃.

       （Note: the above two kinds of stuffing box packing seal gate valve has the advantages: No, avoids external leakage, at the same time, reduce the energy consumption. Disadvantages: complex structure, high manufacturing cost.）

    ⑵ Stop valve：

    For the auxiliary line stop valve. The valve is usually three structures, namely the filler type stop valve, bellows stop valve and the metal diaphragm type stop valve. The valve medium medium parameters ( temperature, pressure ) water and steam; nominal size: DN10~150mm.

    ⑶ Butterfly valve：

    For the cooling system and the safety shell conveying air system of butterfly valve. The valve is usually three structures, namely the coaxial type butterfly valve, eccentric metal sealing butterfly valve and double action type ( butterfly plate in rotary before undocking in dense cover and rotary ) metal seal butterfly valve. The valve nominal diameter: DN ≤2500 mm; PN < 4.0MPa; job stress: operating temperature:100~150 ℃. In addition, for air duct system in the valve closed fast, its nominal diameter: DN400~1200mm is also listed as a development direction.

    ⑷ With detectors of pilot operated safety valve: 

    For the nuclear island system with detector of pilot operated safety valve. The detector of the pilot operated safety valve, can according to the pressure and spring force balance sensitive relationship, to change the location of the controlled release and filling medium two contact principle, from the structure to avoid choking problem. The valve adopts the positive role of the type with spring preload and bellows sealed valve structure, can ensure the reliable sealing. The valve nominal diameter: DN600mm; working pressure: PN1.265MPa.

    ⑸ Check valve isolating valve： 

    For steam system of check valve type isolation valve, its structure is similar in shape to a lift check valve. The valve nominal diameter: DN64~800mm (21/2in~30in ); working pressure: PN1.0~42.0MPa ( Class600~2500); working temperature: -29~1050 ℃. 

    ⑹ Main steam isolation valve 

    Conventional island of nuclear island and the main steam isolation valve, the main water supply valve, its nominal diameter: DN800mm;40.0MPa; nominal pressure: temperature 700 ℃;

    ( in addition, meet the seismic requirements of safety valve is in urgent need of the development of nuclear power valve )

    4． Marine oil valve

    Offshore platform oil extraction, blowout prevention, water injection, gas injection, underwater equipment system need to develop some seawater, salt fog corrosion requirements of the special valve. These valves have strong corrosion, storms and other abnormal external force, and sealing is reliable, flexible operation, convenient repair.

    Marine oil valve used in the development of specific types, parameters are as follows:

    ⑴ Forged steel single gate or gate valvesdiversion hole or without diversion hole plate valve

    The structure of the valve can consult the United States Cameron F type gate valve," AF" type submarine valve ( for the 1000 meters under the sea )," DF" type submarine valve ( for the 3000 meters under the sea ), MCEVOY type C, E type gate valve. This kind of valve size: DN46~162mm (113/16in~63/8in ); nominal pressure level for API2000psi,3000psi,5000PSI,10000psi,15000psi,20000psi; working temperature: -59~343 ℃; technical requirements according to API6A regulations.

        ⑵ Double valve butterfly check valve

    The valve technical parameters: nominal diameter: DN53~280mm (21/16in~11in ); nominal pressure level for API2000psi,3000psi,5000PSI,10000psi,15000psi,20000psi; temperature grade K ( -60~182 ℃), L ( -42~182 ℃), P ( -29~182 ℃), R ( room temperature ), S ( -18~166 ℃), T ( -18~182 ℃), U ( -18~121 ℃), V (2~121 ℃); material requirements for AA, BB, CC, DD, EE, FF, HH; material performance requirements according to 36K,45K,60K,75K; product technical requirements according to PSL1( product specification Level 1), PSL2( product specification grade2), PSL3( product specification Level 3), PSL4( product specification Level 4).

    ⑶ Pressure balance valve angle valve

    The valve is designed, manufactured by the API6A standard; its nominal pressure level for the API3000psi,5000PSI,10000psi; nominal size: DN50mm, DN80mm, DN100mm, DN150mm (2in,3in,4in,6in ); the use of temperature: -29~121 ℃. ( the throttle valve head can be designed for needle type throttle throttle sleeve head or head ).

    5．Petrochemical, electric valve

    Petrochemical, electric valve products, it’s the key of structural adjustment is available product development. As follows:

    ⑴ High temperature and high pressure regulating valve

    For large thermal power unit for high temperature and high pressure regulating valve, the structure design should be based on the flow characteristics and operation control requirements to determine the, can be single, can also be a two-seater or sleeve structure. The regulating valve nominal diameter: DN50~500mm; nominal pressure:≤ 42.0MPa; temperature:510~570 ℃.

    ⑵ Pressure reducing valve

    The temperature and pressure reducing valve, petrochemical industry requirements can be designed to be similar to Fisher's CVS valve, and the pressure and temperature control in a valve inside finish, after decompression of the spray cooling control to be accurate ( in the range 4~7 DEG C ), valve shut tight, low noise, long life.

    ⑶ High temperature and high pressure safety valve for large caliber

    For high temperature and high pressure steam system in large caliber safety valve, its design structure adopts a spring. The design of the main solution key question is: the valve set pressure, back pressure, sealing performance, repetitive motion stability and spring fatigue. Its nominal diameter: DN200~400mm; nominal pressure:≤ 5.0MPa; maximum temperature:570 ℃.

    ⑷ High pressure steam hydrophobic valve

    High pressure steam system for draining condensed water high pressure steam valve, the structure of development for thermal power type HRW, HRF disk type; mechanical high-voltage free float ball type; thermal static type BK27, BK28, BK212double sheet metal. The valve size: DN15~50mm; nominal pressure : 15.0MPa.

    6．Environmental protection valve

    The environmental protection system development: ceramic sealing valve rotary valve, PVC plastic valve, flat gate valve, sealing surface of stainless steel plug valves etc..

    7．Metallurgy system valves

    Metallurgy system valves, due to dielectric constant for the powder and suspended solid granular, coupled with higher temperature, so the valve wear, heat resistance and corrosion resistance and other higher.

        Metallurgy system valves the development of specific types, parameters are as follows:

    ⑴ Dome valve

    Used for thermal power plant fly ash pneumatic removing, feed, discharge system of dome valve. The valve consists of a valve body, a driving shaft, a driven shaft, sphere, its nominal diameter: DN50~300mm; PN1.0~0.6MPa; job stress: the maximum use temperature:1050 ℃. Design of the valve, the sealing cover should consider adopting spraying cobalt tungsten carbide alloy material, making it more rigid, enhanced wear resistance.

    ⑵ Ash flat gate valve

    Used in the steelmaking plant of iron dust removal system of" ash flat gate valve". The dust removal system of medium --" ash", not only the shape of particles (sometimes fragmented shape, is sometimes mixed shape ), but also has certain viscosity, also with carbon monoxide (CO ). As a result of the medium" ash" in grains, seat often have varying degrees of damage, abrasion, wear, therefore, the" ash flat gate valve " of the main parts, such as gate, valve seat and other parts shall have a strong wear resistance. Iron dust removal system in condition of using pressure about 0.25MPa in the low pressure range; temperature≤ 250 ℃range ( usually at room temperature, sometimes instantaneous temperature can reach 250 ℃); nominal pipe size only from DN50mm~DN400mm ( DN300mm diameter being the most common).

    The valve structure such as with diversion hole", and increase the sealing surface of the seal" design, not only can improve the wear resistance of the sealing performance; satisfaction; but also can avoid ash into body bottom cavity. In the design, can make full use of the existing belt deflector plate gate valve products, will be changed to" increase the sealing surface of valve seat sealing state". On the wear resistance, the metal to metal seal life is the longest, but metal on metal" to increase the sealing surface of the seal", a standard allowable leakage, ( such as the design of zero leakage cost would be very high and difficult processing ); two sealing as non-metallic materials. The sealing is non-metallic materials, because the metal surface abrasion will produce a layer of oxide, although this layer of oxide covered on the corroded part, can slow down the further metal corrosion, but if the slide occurred words, the oxide layer can be removed, so that the exposed metal surface from further corrosion, in order to accelerate wear, weakening its sealing performance. And the use of non metal material, not only can save cost, reduce the processing difficulty, but also can guarantee the sealing performance.

    As a result of steel blast furnace dust removal system of temperature conditions is generally normal, sometimes only250 ℃instantaneous maximum temperature. So the use of non-metallic materials ( recommended the use of digital polystyrene ) for sealing, which can not only meet the operating temperature, wear resistance, and can meet the sealing performance. Non metallic materials -- ppl, applicable temperature is≤ 300 ℃, and PTFE more than the hard hard, can satisfy the ironmaking plant ash handling system condition, is the ideal sealing surface material. The seat material suggested by 1Cr13.

    ⑶ Resistance to acid corrosion of stainless steel valve

    Metallurgy system with resistance to acid corrosion of stainless steel valve. The valve nominal diameter: DN50~2400mm; nominal pressure 0.05~1.6MPa maximum use temperature:1050 ℃.

    8． Alumina industrial valves

    Alumina industry in the production process, medium for alkaline mud and granular material, scarring the phenomenon is very serious, and the medium to the cavity of the valve body and internal erosion phenomenon is also very serious. Therefore, alumina industrial valves requires its anti scale resistance to scab; erosion erosion.

    Set alumina production system general structure of gate valve, globe valve, ball valve and so on many of longer than a slurry valve ( stop valve ), not only against the scab resistance to scab, and erosion resistant to erosion, is the ideal product of alumina production with valve. The valve of the overall structure of the Y type structure, namely, the central line of the valve rod on the medium flow direction45°, connection in the form of flange connection; support for polished rod; sealing surface of hard surfacing alloy; body by two open, intermediate clamping seat form, in order to prevent the medium to the cavity of the erosion, in the cavity of the body by scoured seriously site enchased wearing hard alloy steel.

    The valve nominal pressure level is CL150( PN2.0MPa ), CL300( PN5.0Mpa ), CL400( PN6.4MPa ); nominal size: DN50~350mm; working temperature:≤ 450 ℃.
    9．Large chemical plant valves

    Large chemical plant mainly ethylene, ammonia, air classification device

    ⑴ Ethylene device with valve

    Ethylene production of raw materials used for normal pressure light diesel oil and vacuum gas oil, and ethylene device working condition is very poor, high temperature (900 ℃), pressure (10 Mpa ), temperature ( -196 ℃), large flux in ethylene of.

    Ethylene plant with valve development of specific types, parameters are as follows:

    a High temperature cracking flat gate valve

    The valve is sealed and support type two. Its nominal diameter: DN15~1200mm;0.05~1.6MPa; nominal pressure: the maximum use temperature:800 ℃.

    bCryogenic valve

    The structure of the valve gate valve, stop valve may be in the form of the structure form, can also be a check valve structure. Its nominal diameter: DN50~700mm;1.6~6.4MPa; nominal pressure: minimum operating temperature: -196 ℃.

    ⑵ Ammonia valve

    Ammonia synthesis unit media mainly into three categories, namely the synthesis gas containing H2, N2-- CO, CO2, NH3 synthesis, composition similar to the artificial coal gas ( H2 belongs to the explosive limit of very low very dangerous gas, toxic CO ); urea -- containing NH3, CO2, ammonia, liquid ammonia or ammonia vapor. Synthetic ammonia device valve maximum operating temperature is about 500 ℃, the minimum temperature of liquid ammonia medium at -196 ℃, the maximum working pressure up to 32.0MPa.

    Synthetic ammonia device valve development of specific types, parameters are as follows:

    a High temperature, high pressure angle type globe valve

    The valve nominal diameter: DN10~1100mm; nominal pressure:≤ 42.0MPa; maximum temperature:560 ℃.

    b Throttle valve

    The valve nominal diameter: DN10~1100mm; nominal pressure:≤ 42.0MPa; maximum temperature:560 ℃.

    ⑶ Air separation device with valve

    As a result of air separation device for producing oxygen, nitrogen gas process is -183℃, therefore air separation device with valve requirements of high.

    Air separation device with valve development of specific types, parameters are as follows:

    Low temperature valve used in air separation unit. The valve nominal diameter: DN1.5~900mm;0.2~16.0MPa; nominal pressure: minimum operating temperature: -183 ℃.

    10．Urban construction with valve

    Building valves will be presented as follows: the development trend of city gas turbine fuel gas shutoff valve; development of city water supply and heating system to replace common butterfly valve, low-pressure valve and stop valve and the center line butterfly valve soft sealing gate valve; the development of automotive liquefied petroleum gas, liquefied natural gas -- gas cylindersValve。The development of city building heating, air conditioning with hydraulic balance valve, intelligent instrument and heat metering valve. The development of city gas pipeline safety valve, electric flow regulating valve, pneumatic and hydraulic linkage emergency cut-off valve.

    Understand the market demand of valve product, attached to the valve products constantly updated, for various industries to provide the most advanced technology products, is the valve company in order to survive in the competition, and development the only way.