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Explosion proof liquid ammonia emergency shut-off valve - ammonia emergency shut-off valve QDQ421F
Explosion proof liquid ammonia emergency shut-off valve - ammonia emergency shut-off valve QDQ421F Valve brand: Shanghai Shuangheng Valve model: QDQ42
Product details
1QDQ421F Explosion proof Liquid Ammonia Emergency Cut off Valve--Purpose:
QDQ421F Explosion proof Liquid Ammonia Emergency Cut off ValveDivided into single acting and double acting types, it can achieve remote control of opening and closing. To activate, simply press the control button, and all other tasks will be automatically completed within the specified time. The single button safety opening and closing is equipped with an emergency stop button to ensure safe operation. If a remote signal feedback system is installed, the valve operation status can be directly obtained from the remote control room.
IIQDQ421F Explosion proof Liquid Ammonia Emergency Cut off Valve--Performance specifications
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specifications
(DN)
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nominal
pressure
(Mpa)
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seal
test
pressure
(Mpa)
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work
temperature
(℃)
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apply
medium
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Control cylinder section
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electricity
source
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||
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Valve flap
open
height
(mm)
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use
medium
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Valve disc open
The most atmospheric time
Pressure (Mpa)
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||||||
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25
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2.5
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2.75
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-40℃~+80℃
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lpg
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15
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nitrogen
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0.6MPa
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-AC220/DC24
|
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40
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2.5
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2.75
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18
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0.6MPa
|
||||
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50
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2.5
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2.75
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20
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0.6MPa
|
||||
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80
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2.5
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2.75
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27
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0.6MPa
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||||
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250
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2.5
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2.75
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90
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0.6MPa
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||||
IIIQDQ421F Explosion proof Liquid Ammonia Emergency Cut off Valve--Main component materials:
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Part name
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material
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valve body
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WCB
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Valve body sealing ring
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Tetrafluoroethylene
|
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Valve flap
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2Cr13
|
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Oil cylinder/cylinder
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25#Steel/ductile iron
|
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spring
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4Cr13/60Si12mn
|
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piston
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2Cr13
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4、 Operating principle and structural description:
1. Single acting working principle: When the valve is operated without external pressure, the valve disc is in a normally closed state. When used in pipeline or storage tank systems, the valve is opened by the pressure of the power and gas sources. Under the pressure of the gas path, the valve is in an open state. When the valve needs to be closed, the power or gas source pressure can be released, and the valve will automatically close.
2. When the valve disc is closed, pressure is achieved by opening the pressure relief valve.
3. Normally open type can be replaced by single acting or customized according to requirements.
4. Double acting working principle: When the controller outputs an electrical signal to a certain electromagnetic directional valve according to a pre programmed program, the electromagnetic directional valve will act, causing the pressurized instrument air source to enter the lower chamber of the pneumatic actuator through the switching of the electromagnetic directional valve, pushing the piston upward. The piston drives the valve stem, and the valve stem lifts the valve core to open the valve, cutting off the electrical signal of the directional valve, causing the piston to move in the opposite direction and close the valve. This valve configuration is called normally closed. On the contrary, to make it normally open, it is only necessary to change the connection method between the electromagnetic directional valve and the pneumatic actuator(See the figure below)
5Main external dimensions and connection dimensions (refer to the composition):
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DN
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D
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D1
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D2
|
b
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F
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z-Ф
|
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25
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115
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85
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65
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16
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2
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4-Ф14
|
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40
|
145
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110
|
85
|
18
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2
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4-Ф18
|
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50
|
160
|
125
|
100
|
20
|
3
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4-Ф18
|
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80
|
195
|
160
|
135
|
22
|
3
|
8-Ф18
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6、 Precautions for storage, installation, and use:
1. Both ends of the valve passage must be covered with protective covers and stored in a dry and ventilated room. If stored for a long time, regular inspections should be conducted to prevent rusting;
2. Do not remove the dust cover of the valve before installation to ensure that there is no dirt inside the valve;
3. Valves can be installed on horizontal or vertical pipelines for use. During installation, remove the dust cover and blow the pipeline clean with air to prevent dirt from entering the valve chamber;
4. After the valve is left for 12-14 hours every day, the valve disc should be promptly closed when the system is not working to avoid long-term compression of the spring and reduce the reliability of long-term use of the valve.
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