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Valve selection description

Time:2016-07-05  Views:3950
Valve selection instructions:
1 types: according to the piping system design needs and various types of valves and installation of their own characteristics and other factors to determine the use of the valve.
2 transmission: according to the valve parameters, functions, operating requirements and field conditions, such as valve transmission mode selection. Our company can provide users with manual, electric, pneumatic, hydraulic, electromagnetic, automatic and other types of valves, users can also request matching.
3 valve material: the valve used by the use of its materials in common conditions (medium, temperature, pressure, etc.) to decide.
4: the valve nominal pressure specified temperature, working pressure, the whole numerical circle for reference, divided into different levels, with PN said, according to the provisions of GB/T1048-1990, GB valve unit is MPa, pound valve LB.
5 connection: according to the valve operating conditions and installation requirements using different connection ways, generally have threaded connections, flange connections, welded connections, clamp connections.
6 structure length: users without special requirements, according to the valve design standards (GB, API, ANSI, BS, etc.) in the provisions of manufacturing.
7 structure: according to the working conditions (pressure, temperature, medium, installation position) and structure characteristics of various valves, how to choose.
8 nominal diameter: according to the provisions of the GB/T1047 to choose, to DN, the unit is mm, pound valve with NPS, unit (in).
9 according to the above points can basically determine the specific model of the valve, the valve model for the next section, for special, non-standard and pound valve models, reference JB/T308-1975 by the enterprise.
10 valve in the selection, should also refer to different materials according to the conditions of the "pressure temperature rating" to determine the valve material and model.
11 order:
A, for the performance of the sample parameters meet several specifications of the valve users can be selected according to the model listed in this sample. If there are special requirements (such as specifications, materials, transmission, connection size, structural form, etc.) should be described in detail.
B, electric valve accessories in electric control box and automatic control valve servo amplifier, operation box, pneumatic valve solenoid valve, etc. by the customer self distribution. Can also be provided by the company, but the price of another. Construction, municipal, plumbing and other industries with the valve please refer to the company's product sample A book.
Methods model: valve type system is composed of 7 units, its contents are shown: the nominal pressure, represented by Arabia digital, its value is 10 MPa (MPa) times for the nominal pressure value of the units used in power plants, industrial valves, when the highest temperature exceeding 530 DEG C, the numerical MPa (MPa) is 10 times the working pressure of the unit.
Refer to JB4018-85 standard, the method of model establishment is as follows:
Code 01234567, 89
Transmission mode of electromagnetic dynamic electromagnetic hydraulic electro-hydraulic gear gear bevel gear pneumatic fluid power - hydraulic motor
The connection form in external thread flange welding clamp on his sleeve
Type code structure
Gate valve Z bright rod dark bar
Wedge parallel wedge parallel type
Elastic damper
Single gate double gate single gate double gate single gate double gate single gate double gate
J valve straight through three right angle type DC balance formula
Throttle L straight through right angle type
Ball Q floating ball fixing ball
Straight through type Y three formula three L - three type T formula formula four straight formula
Butterfly D lever vertical plate skew plate
Diaphragm valve G roof type cut-off type DC plate through gate type angle Y angle T shape
Plug X packing type
Straight through type T shaped three formula four formula L straight T shape three pass through
Check valve H lift swing Butterfly
Straight vertical single multi valvuler
Safety valve A spring pulse type
Closed closed closed not closed
Full opening and reverse type full starting type spanner type lever belt control mechanism spanner with heat sink
Double spring micro start type all Kai ten Kai type full start type
Pressure relief valve Y thin touch spring thin touch piston bellows type lever type
Drain valve S ball float type bellfloat type bimetal disc type pulse
Common valve material comparison table:
Sealing surface or lining material designation sealing surface or lining material code
Copper alloy T nitriding steel D
Rubber X hard alloy Y
Nylon plastic N plastic rubber J
Fluorine plastic F lead Q
Pap B enamel C
Alloy steel H boronized steel P
Code T C K Q Z
The body material of gray cast iron copper alloy steel malleable cast iron ductile iron
Code C P R V I
Body material Cr5Mo
C5
WCB
Twenty-five
A105
1Cr18Ni9Ti
ZG1Cr8Ni9Ti
CF8 (304)
CF3 (304L)
1Cr18Ni12Mo2Ti
ZG1Cr8Ni12Mo
2Ti
CF8M (316)
CF3M (316L)
12Cr1MoV
ZG15CrMo1V
ZG20CrMoV
WC6
WC9
Note: users should order according to the model of our products, if there are special requirements, please specify in the order contract.Valve selection instructions:
1. Type: decide which valve to use according to the needs of pipeline system design and the characteristics of various types of valves, installation and use.
2. Transmission mode: select the valve transmission mode according to valve parameters, functions, operation requirements and field conditions. I can provide users with manual, electric, pneumatic, hydraulic, electromagnetic, automatic and other types of valves, but also according to user requirements.
3. Valve material: the material used on the valve is determined by its common conditions (medium, temperature, pressure, etc.).
4. Nominal pressure: the working pressure at the specified temperature of the valve is a round integral value for reference, divided into different grades, represented by PN, according to GB/ t1048-1990, the GB valve unit is MPa, LB class valve is represented by LB.
5. Connection mode: different connection modes are selected according to the operating conditions and installation requirements of the valve, including threaded connection, flange connection, butt welding connection, clamp connection, etc.
6. Structure length: no special requirements of the user, manufactured in accordance with the design standards (GB, API, ANSI, BS, etc.) implemented by the valve.
7. Structure: according to the working conditions (pressure, medium, temperature, installation location, etc.) and the structural characteristics of various valves, choose to maximize strengths and avoid weaknesses.
8. Nominal size: selected according to GB/T1047, expressed in DN, expressed in mm, and expressed in NPS, expressed in (in).
9. The specific type of valve can be basically determined according to the above points. The preparation of valve type is shown in the next section.
10. When selecting the valve, the valve material and model should be determined by referring to the pressure and temperature grades of different materials according to the working conditions.
11. The order:
A. For the valve users who meet the performance parameters of this sample, the models listed in this sample can be selected. If there are special requirements (such as specifications, materials, gearing, connection dimensions, structural forms, etc.) should be added in detail.
B. The servo amplifier, operation box and solenoid directional valve of the electric control box and automatic regulating valve of the electric accessories in the electric valve shall be provided by the customer. Can also be provided by our company, but the price is another. For valves for construction, municipal, water supply and drainage industries, please refer to our product sample book A.
Model establishment method: the model establishment of the valve is composed of seven units, its content as shown: nominal pressure, expressed with Arabic numerals, its value is the MPa (MPa) for unit 10 times the value of the nominal pressure, the valve used in the plant industry, when the medium temperature over 530 ℃, its value in MPa (MPa) as the unit of work pressure value of 10 times.