Ningbo CQ Machining Co., Ltd.
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Payment Terms: | T/T,L/C |
Place of Origin: | Zhejiang, China (Mainland) |
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Reducing valve (reducing valve) is the use of a control valve opening and closing parts of the body to regulate the flow of the medium, the medium will reduce the pressure, but the pressure by means of the valve opening and closing parts of the role of regulation, so that the valve pressure maintained within a certain range, and spray the valve or the valve body into the cooling water, the temperature of the medium is reduced, the pressure reduction valves as the valve temperature. Characteristics of the valve, the inlet pressure in the case of changing to keep listening to the outlet pressure and temperature values within a certain range. Valve pneumatic control valve is a necessary accessory, the main role is to source gas pressure and the pressure stabilized to a constant value, in order to adjust the valve to obtain a stable source of power for air conditioning control. This type valve in the pipe should generally be installed horizontally.
A gas valve automatically reduces the working pressure line special apparatus which can be a high pressure liquid line before the valve to the valve to reduce the piping required level. Many types of valve structure, according to the structure can be divided into the film, spring diaphragm, piston, lever type and bellows type and so on. The number of seats can be artificially by single-block and two-seater. According to the position of the valve can be divided into positive-action and reaction type. Can be divided according to media nitrogen valve, hydrogen valve, oxygen valve and so on. The basic role is to rely on the principle of pressure reducing valve flow channel to reduce local resistance to the flow of water pressure, water pressure drop range automatically adjusted by connecting valve film or import and export of water pressure on both sides of the piston. Fixed ratio decompression valve principle is to use floating piston pressure ratio control, import and export terminal side of the piston and the pressure ratio is inversely proportional to area ratio, the valve work smoothly without vibration, making the domestic valve production technology to further improve;
Gas valve performance standards, according to JB/T2205-2000 "valve structure length" [1] based utility category. Currently most of valve manufacturers designed and manufactured in accordance with this standard, but the standards are not perfect, incomplete specifications. The valve according to the manufacturer's specifications and the production of information available, the manufacturers are not unified connection size, the proposed General Machinery Research Institute for JB/T2205-2000 "valve structure length" be revised. Proposed institute and the user selected standard valve manufacturers standard design and manufacturing.
Gas valve spare parts
Valve
1 pilot valve
When a higher output pressure or valve diameter is larger, with a direct regulator regulator spring, the spring stiffness necessarily too large, flow changes, the output pressure fluctuations, the structure will also increase the size of the valve. To overcome these shortcomings, can be pilot valve. Basically the same pilot type valve works with direct-acting. Pilot gas regulator valve used is determined by a small direct-acting valve supply. If the small direct acting pressure reducing valve mounted inside the body, it is called an internal pilot valve; If small direct acting pressure reducing valve installed in the main body outside, then called external pilot valve . Compared with internal pilot type valve direct acting valve, the valve nozzle increased by 4, the baffle 3, 9 and fixed orifice chamber consisting of a nozzle flapper B amplification link. When the distance between the nozzle and the baffle when small changes, it will cause pressure in the chamber B significant changes roots occur, thus causing the diaphragm 10 has a larger displacement, to control the vertical movement of the spool 6, the inlet 8 large or open valve port off small, to improve the sensitivity control on the spool, which improves the regulation accuracy.
External pilot valve works with direct-acting the same. Outside the main body and a small direct-acting valve (end figure shown), which is controlled by the main valve. Such valves suitable for 20mm or more in diameter, distance (30m or less), height, dangerous place, the regulator difficult situations.
2 direct-acting relief valve with
P1 pressure of compressed air, the latter from the left end of the input port 10 through the throttle valve, pressure drop P2 output. P2's size can be adjusted regulator spring 2,3. Turn the knob clockwise 1, 2, 3 and diaphragm compression spring 5 8 spool down, increasing the opening of the valve port 10 so that P2 increases. If a counter-clockwise rotation of the knob, opening of the valve port 10 is reduced, P2 decreases.
If the transient elevated P1, P2 will subsequently increases, so the pressure in the diaphragm chamber 6 increases, the thrust generated by the diaphragm 5 is increased accordingly, the destruction of the balance of the original thrust force, the diaphragm 5 up mobile, 12, a small part of the air exhaust vent through the overflow hole 11. While the diaphragm moves, by the action of the return spring 9, the spool 8 is moved upward, off a small intake valve port 10, to increase the throttling effect, the output pressure decreases until reaching a new equilibrium is attained, the output pressure substantially back to the original value. If you enter the instantaneous pressure drop, the output pressure drop, the diaphragm 5 down, down along the spool 8, the intake valve port 10 open big, throttling effect is reduced, so that the output pressure is basically back to the original value. Rotate the knob counterclockwise 1. 2,3 relax the adjusting spring, the gas acting on the membrane 5 is greater than the thrust force of the regulating spring, the diaphragm upwardly curved, by the action of the return spring to close the intake valve port 10. Then rotating the knob 1, the intake air relief valve body seat 4 and the top 8 is disengaged, then 12, vent hole 11 is discharged through the overflow chamber 6 of the diaphragm compressed air, in a non-output state of the valve .
Valve accessories
Other requirements
1, Pressure: 1.0MPa, 1.6MPa, 2.5MPa
2, Shell test pressure: P = 1.5PN
3, sealing test pressure: P = 1.1PN
4, outlet pressure: PN1.0MPa regulating valve 0.09 ~ 0.8MPa
PN1.6MPa valve 0.10 ~ 1.2MPa
PN2.5MPa valve 0.15 ~ 1.6MPa
5, Suitable medium: water
6, suitable temperature: 0 ℃ ~ 80 ℃
Basic performance
Pressure Range:
Pressure range is the valve output pressure P2 can adjust the range of control to achieve the required accuracy within the adjustable range of requirements. The main scope of the regulator and the regulator spring stiffness related.
Pressure characteristics:
The flow pressure characteristics refer to the value g, the pressure fluctuations caused by the input output characteristics of the pressure fluctuation. Output pressure fluctuations smaller valve characteristics better. The output pressure must be lower than the input pressure - with value was not substantially change the input pressure.
Flow characteristics:
Flow characteristics refer to the input pressure - the timing, the output pressure changes with the output flow g of support varies. G When the flow changes, the change in output pressure, the better. The lower the general output pressure, which changes with the smaller output flow fluctuations.
Structural features
This product is mainly used for gas piping, such as air, nitrogen, oxygen, hydrogen, liquefied petroleum gas, natural gas and other gases.
This series belongs to the pilot valve piston valve. From the main valve and pilot valve composed of two parts.
The main valve from the valve seat, the main valve plate, piston, springs and other parts.
Mainly by the pilot valve seat, valve, diaphragm, spring, adjusting springs and other parts.
Set by adjusting the outlet pressure adjusting spring pressure, changes in the use of outlet pressure sensing diaphragm, piston driven through the pilot valve opening and closing the main valve regulating the flow restrictor parts over the size of the area to achieve vacuum regulator function.
Flow Coefficient
DN | 15 | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 125 | 150 |
Cv | 1 | 2.5 | 4 | 6.5 | 9 | 16 | 25 | 36 | 64 | 100 | 140 |
DN | Dimensions | Connection Size | |||||||||||||
L | H | H1 | 1.6MPa | 2.5MPa | 4.0MPa | 6.4MPa | |||||||||
D | D1 | Z-d | D | D1 | Z-d | D | D1 | Z-d | D | D1 | Z-d | ||||
15 | 140 | 285 | 85 | 95 | 65 | 4-12 | 95 | 65 | 4-14 | 95 | 65 | 4-14 | 105 | 75 | 4-14 |
20 | 160 | 285 | 85 | 105 | 75 | 4-12 | 105 | 75 | 4-14 | 105 | 75 | 4-14 | 125 | 90 | 4-18 |
25 | 180 | 290 | 100 | 115 | 85 | 4-12 | 115 | 85 | 4-14 | 115 | 85 | 4-14 | 135 | 100 | 4-18 |
32 | 200 | 290 | 105 | 140 | 100 | 4-18 | 135 | 100 | 4-18 | 135 | 100 | 4-18 | 150 | 110 | 4-23 |
40 | 220 | 310 | 110 | 150 | 110 | 4-18 | 145 | 110 | 4-18 | 145 | 110 | 4-18 | 165 | 125 | 4-23 |
50 | 250 | 310 | 110 | 165 | 125 | 4-18 | 160 | 125 | 4-18 | 160 | 125 | 4-18 | 175 | 135 | 4-23 |
65 | 280 | 310 | 115 | 185 | 145 | 4-18 | 180 | 145 | 8-18 | 180 | 145 | 8-18 | 200 | 160 | 8-23 |
80 | 310 | 340 | 155 | 200 | 160 | 8-18 | 195 | 160 | 8-18 | 195 | 160 | 8-18 | 210 | 170 | 8-23 |
100 | 350 | 340 | 155 | 220 | 180 | 8-18 | 235 | 190 | 8-23 | 230 | 190 | 8-23 | 250 | 200 | 8-25 |
125 | 400 | 375 | 190 | 250 | 210 | 8-18 | 270 | 220 | 8-25 | 270 | 220 | 8-25 | 295 | 240 | 8-30 |
150 | 450 | 375 | 200 | 285 | 240 | 8-23 | 300 | 250 | 8-25 | 300 | 250 | 8-25 | 340 | 280 | 8-34 |
200 | 550 | 475 | 225 | 340 | 295 | 12-23 | 360 | 310 | 12-25 | 375 | 320 | 12-30 | 405 | 345 | 12-34 |
250 | 650 | 535 | 290 | 405 | 355 | 12-25 | 425 | 370 | 12-30 | 445 | 385 | 12-34 | 470 | 400 | 12-41 |
300 | 800 | 595 | 320 | 460 | 410 | 12-25 | 485 | 430 | 16-30 | 510 | 450 | 16-34 | 530 | 460 | 16-41 |
350 | 900 | 650 | 355 | 520 | 460 | 16-25 | 550 | 490 | 16-34 | 570 | 510 | 16-34 | 595 | 525 | 16-41 |
400 | 1000 | 700 | 395 | 580 | 525 | 16-30 | 610 | 550 | 16-34 | 655 | 585 | 16-41 | 670 | 585 | 16-48 |
Our factory:
We can machining all kinds of die casting vale accessories.
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We will quote the competitive price to you.
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