The electric valve has a larger force than the ordinary valve. The speed of the electric valve can be adjusted, the structure is simple, and it is easy to maintain. Because of the buffering property of the gas during the operation, it is not easy to be damaged due to jamming, but it must have a gas source and its control. The system is also more complicated than electric valves. This type of valve should generally be installed horizontally in the pipeline.
Pneumatic valves are responsive, safe and reliable, and many plants with high control requirements are specifically equipped with compressed air stations for pneumatic instrument control components. Electric is to electricity. And can control its flow device.
An electric valve is simply an electric actuator that controls a valve to open and close the valve. It can be divided into upper and lower parts. The upper part is the electric actuator and the lower part is the valve.
Electric valve: Analog control for medium flow in liquid, gas, and air systems. AO control. In the control of large valves and wind systems, electric switches can also be used for two-position switch control.
Electric valves are usually connected by electric actuators and valves and become electric valves after installation and commissioning. The electric valve uses electric energy as a power to switch on the electric actuator driving valve to realize the valve switching and regulating action. In order to achieve the purpose of switching or regulating the medium of the pipeline.
The solenoid valve is a kind of electric valve; it uses the magnetic field generated by the electromagnetic coil to pull the valve core, thus changing the on-off of the valve body, and the coil is powered off. The valve core relies on the pressure of the Spring to retreat.
Electric valve operation method
1 Preparation before operation
1.1 Before operating the valve, read the operating instructions carefully.
1.2 The flow of gas must be known before operation. Check the valve opening and closing signs.
1.3 Check the appearance of the electric valve to see if the electric valve is damp. If there is moisture, it should be dried. If there are other problems, it must be dealt with promptly and no operation shall be allowed.
1.4 For an electric device that has been decommissioned for more than 3 months, check the clutch before starting. After confirming that the handle is in the manual position, check the insulation, steering and electrical wiring of the motor.
2 electric valve operation precautions
2.1 When starting, confirm that the clutch lever is in the corresponding position. 2.2 If the control room controls the electric valve, turn the switch to the large REMOTE position, and then control the switch of the electric valve through the SCADA system.
2.3 If the manual control, the switch in the LOCAL position, the local operation of the electric valve switch, electric valve open in place or off in place when it will automatically stop working, and finally to run the switch to the middle position.
2.4 When using on-site operation of the valve, the valve opening and closing instructions and valve stem operation should be monitored. The opening and closing of the valve must meet the requirements.
2.5 When using the on-site operation to fully close the valve, before the valve is closed in place, the electric closing valve shall be stopped and the valve shall be closed in place by micro-motion.
2.6 For the valve after setting the stroke and over-torque controller, when the valve is fully opened or fully closed for the first time, attention should be paid to monitoring the control of the stroke. If the valve does not stop to the position, emergency shutdown should be performed immediately.
2.7 In the process of opening and closing the valve, when the signal indicator lamp is found to be wrong and the valve has abnormal noise, the machine should be stopped and checked in time.
2.8 The power of the electric valve should be turned off after successful operation.
2.9 When operating multiple valves at the same time, pay attention to the sequence of operations and meet the requirements of the production process.
2.10 When opening a larger-diameter valve with a bypass valve, if there is a large differential pressure between the two ends, the bypass valve should be opened to adjust the pressure, and then the main valve should be opened: After the main valve is opened, the bypass valve should be closed immediately.
2.11 The ball valve passing through it must be fully open when the pig is being sent or received.
2.12 Operate the ball valve, gate valve, stop valve, butterfly valve can only be fully opened or fully closed, no adjustment is allowed.
2.13 During the operation of the gate valve, globe valve and plate valve, when it is closed or opened to the top or bottom dead center, it should be rotated 1/2 to 1 turn.
(empty partner network experts)
Electric valve maintenance Daily electric valve maintenance
1, the electric valve should be stored in a dry and ventilated room, the ends of the passage must be blocked.
2, long-term storage of electric valves should be regularly checked to remove dirt, and painted anti-rust oil on the surface.
3. After installation, inspections should be carried out regularly to check the main items:
(1) Seal surface wear.
(2) The trapezoidal thread wear of the stem and stem nut.
(3) Whether the filler is out of date, if it is damaged, replace it in time.
(4) The sealing performance test shall be conducted after the electric valve is overhauled and assembled.
The electric valve in operation, all kinds of valve parts should be complete and intact. The bolts on the flanges and brackets are indispensable and the threads should be intact and loose. The tightening nut on the hand wheel should be tightened in time if loosening is found, so as not to wear the joint or lose the hand wheel and nameplate. If the handwheel is lost, it cannot be replaced with a live spanner. Packing glands must not be skewed or pretensioned. For the electric valve in an environment that is easily contaminated by rain, snow, dust, sand, etc., the valve stem must be equipped with a protective cover. The scale on the electric valve should remain complete, accurate and clear. Seals, caps, and pneumatic accessories for electric valves should be fully intact. The insulation jacket should be free from dents and cracks.
It is not allowed to beat, stand or support heavy objects on the electric valve in operation; in particular non-metallic electric valves and cast iron electric valves must be prohibited.
Classification of electric valves
1. Valves for oil and gas wellhead devices
Valves for oil and gas wellheads are mainly single gate or double gate plates complying with US API 6A standards, forged steel parallel gate valves with diversion holes or diversion holes, mud valves, angular throttle valves, and oilfield-specific parallels. Type control valve, oilfield special straight-through check valve, water injection\polymer special parallel gate valve, clamp type parallel gate valve, pilot type safety valve and check valve.
The nominal pressure levels of electric valves for oil and gas wellhead devices are API2000psi, 3000psi, 5000psi, 10000psi, 15000psi, 20000psi; nominal diameter is DN46~228mm (113/16in~9in); temperature grade is K (-60~182°C) ), L(-42~182°C), P(-29~182°C), R(room temperature), S(-18~166°C), T(-18~182°C), U(-18~121°C) ), V (2 ~ 121 °C); material requirements for AA, BB, CC, DD, EE, FF, HH; material performance requirements by 36K, 45K, 60K, 75K; product technical requirements by PSL1 (product specification level 1) , PSL2 (Product Specification Level 2), PSL3 (Product Specification Level 3), PSL4 (Product Specification Level 4).
2. Valves for long-distance pipelines for oil and gas
Valves used in long-distance pipelines for oil and gas are mainly single or dual gate plates that meet US API 6D standards, flat gate valves with or without diversion holes, and forged or cast steel three-body, top-mounted or all-welded valves. Fixed ball valves; oil seals or pressure balanced plug valves; swing-open or butterfly check valves, ball check valves, pigging valves, etc.
The nominal pressure levels of these electric valves are 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); fireproof test technology requirements according to ISO10497; electric valve pressure test according to ISO5208.
3. Nuclear power valve
Electric valves used in nuclear power have higher technical characteristics and requirements than conventional electric valves used in large-scale thermal power stations. Valves generally include gate valves, globe valves, check valves, butterfly valves, safety valves, main steam isolation valves, ball valves, diaphragm valves, pressure reducing valves, and control valves; the highest technical parameters of typical electric valves are: maximum diameter DN 1200mm (Nuclear level 3 butterfly valve), DN800mm (core 2 main steam isolation valve), DN350mm (core level 1 main circuit gate valve); maximum pressure: about 1500 pounds; maximum temperature: about 350°C; medium: coolant (Borated water) and so on. The requirements for the production of nuclear-grade electric valves are generally based on the nuclear industry standard EJ, the American ASME, the IEEE standard, and the RCC-M design and construction rules for French pressurized water reactor nuclear islands.
The specific types and parameters of nuclear power valve development are as follows:
(1) Gate valve without stuffing box:
a Hydraulically actuated gate valve. The valve uses its own pressure water to push the piston to open or close. The valve nominal diameter: DN350, 400mm; working pressure: PN17.5MPa; working temperature: 315°C. b fully enclosed electric gate valve. The valve should adopt a special screen-closed motor, through the inner planet deceleration mechanism to make the gate open and close movement. The valve nominal diameter: DN100 ~ 800mm; working pressure: PN2.5 ~ 45.0MPa; operating temperature: 200 ~ 500 °C.
Note: The advantages of the two types of non-filling-gate valves mentioned above are: no packing seals, avoiding leakage points, and at the same time, reducing energy consumption. Disadvantages: complex structure and high cost.
(2) Nuclear power shutoff valve:
Used to stop the valve on the line. The valve is usually of three configurations, namely a packing-type stop valve, a bellows-type stop valve, and a metal diaphragm type stop valve. The valve medium is medium parameter (medium temperature, medium pressure) water and steam; nominal diameter: DN10~150mm.
(3) Butterfly valves for nuclear power:
Butterfly valve in systems for cooling system and containment air media in containment. The valve is usually of three structures, namely a coaxial direct-lined rubber-lined butterfly valve, an eccentric metal-sealed butterfly valve, and a double-acting type (the butterfly plate is first released from the sealing surface and then revolved before turning) a metal-sealed butterfly valve. The valve nominal diameter: DN ≤ 2500mm; working pressure: PN <4.0MPa; operating temperature: 100 ~ 150 °C. In addition, the quick-closing butterfly valve used in the air duct system has a nominal diameter of DN400~1200mm, which is also listed as the development direction.
(4) Pilot operated safety valve with detector for nuclear power:
Piloted pilot operated safety valve for nuclear island systems. The pilot-operated safety valve with detector can be used to change the principle of the position control release and the two contacts of the charged medium according to the sensitive relationship between the pressure and the balance of the spring force, so as to avoid the jamming problem from the structure. The valve adopts positive acting spring valve with poppet and bellows seal to ensure reliable sealing. The valve nominal diameter: DN600mm; working pressure: PN1.265MPa.
(5) Non-return valve isolation valve for nuclear power:
A check valve type isolation valve for a steam system is similar in structure to a lift check valve. The valve nominal diameter: DN64 ~ 800mm (21/2in ~ 30in); working pressure: PN1.0 ~ 42.0MPa (Class600 ~ 2500); operating temperature: -29 ~ 1050 °C.
(6) Main steam isolation valve for nuclear power
Main steam isolation valves and main water supply electric valves for nuclear islands and conventional islands. Their nominal diameter: DN800mm; Nominal pressure: 40.0MPa; Temperature 700°C;
In addition, safety valves that meet seismic requirements are also urgently needed for the development of nuclear electric valves.
Pneumatic valves are responsive, safe and reliable, and many plants with high control requirements are specifically equipped with compressed air stations for pneumatic instrument control components. Electric is to electricity. And can control its flow device.
An electric valve is simply an electric actuator that controls a valve to open and close the valve. It can be divided into upper and lower parts. The upper part is the electric actuator and the lower part is the valve.
Electric valve: Analog control for medium flow in liquid, gas, and air systems. AO control. In the control of large valves and wind systems, electric switches can also be used for two-position switch control.
Electric valves are usually connected by electric actuators and valves and become electric valves after installation and commissioning. The electric valve uses electric energy as a power to switch on the electric actuator driving valve to realize the valve switching and regulating action. In order to achieve the purpose of switching or regulating the medium of the pipeline.
The solenoid valve is a kind of electric valve; it uses the magnetic field generated by the electromagnetic coil to pull the valve core, thus changing the on-off of the valve body, and the coil is powered off. The valve core relies on the pressure of the Spring to retreat.
Electric valve operation method
1 Preparation before operation
1.1 Before operating the valve, read the operating instructions carefully.
1.2 The flow of gas must be known before operation. Check the valve opening and closing signs.
1.3 Check the appearance of the electric valve to see if the electric valve is damp. If there is moisture, it should be dried. If there are other problems, it must be dealt with promptly and no operation shall be allowed.
1.4 For an electric device that has been decommissioned for more than 3 months, check the clutch before starting. After confirming that the handle is in the manual position, check the insulation, steering and electrical wiring of the motor.
2 electric valve operation precautions
2.1 When starting, confirm that the clutch lever is in the corresponding position. 2.2 If the control room controls the electric valve, turn the switch to the large REMOTE position, and then control the switch of the electric valve through the SCADA system.
2.3 If the manual control, the switch in the LOCAL position, the local operation of the electric valve switch, electric valve open in place or off in place when it will automatically stop working, and finally to run the switch to the middle position.
2.4 When using on-site operation of the valve, the valve opening and closing instructions and valve stem operation should be monitored. The opening and closing of the valve must meet the requirements.
2.5 When using the on-site operation to fully close the valve, before the valve is closed in place, the electric closing valve shall be stopped and the valve shall be closed in place by micro-motion.
2.6 For the valve after setting the stroke and over-torque controller, when the valve is fully opened or fully closed for the first time, attention should be paid to monitoring the control of the stroke. If the valve does not stop to the position, emergency shutdown should be performed immediately.
2.7 In the process of opening and closing the valve, when the signal indicator lamp is found to be wrong and the valve has abnormal noise, the machine should be stopped and checked in time.
2.8 The power of the electric valve should be turned off after successful operation.
2.9 When operating multiple valves at the same time, pay attention to the sequence of operations and meet the requirements of the production process.
2.10 When opening a larger-diameter valve with a bypass valve, if there is a large differential pressure between the two ends, the bypass valve should be opened to adjust the pressure, and then the main valve should be opened: After the main valve is opened, the bypass valve should be closed immediately.
2.11 The ball valve passing through it must be fully open when the pig is being sent or received.
2.12 Operate the ball valve, gate valve, stop valve, butterfly valve can only be fully opened or fully closed, no adjustment is allowed.
2.13 During the operation of the gate valve, globe valve and plate valve, when it is closed or opened to the top or bottom dead center, it should be rotated 1/2 to 1 turn.
(empty partner network experts)
Electric valve maintenance Daily electric valve maintenance
1, the electric valve should be stored in a dry and ventilated room, the ends of the passage must be blocked.
2, long-term storage of electric valves should be regularly checked to remove dirt, and painted anti-rust oil on the surface.
3. After installation, inspections should be carried out regularly to check the main items:
(1) Seal surface wear.
(2) The trapezoidal thread wear of the stem and stem nut.
(3) Whether the filler is out of date, if it is damaged, replace it in time.
(4) The sealing performance test shall be conducted after the electric valve is overhauled and assembled.
The electric valve in operation, all kinds of valve parts should be complete and intact. The bolts on the flanges and brackets are indispensable and the threads should be intact and loose. The tightening nut on the hand wheel should be tightened in time if loosening is found, so as not to wear the joint or lose the hand wheel and nameplate. If the handwheel is lost, it cannot be replaced with a live spanner. Packing glands must not be skewed or pretensioned. For the electric valve in an environment that is easily contaminated by rain, snow, dust, sand, etc., the valve stem must be equipped with a protective cover. The scale on the electric valve should remain complete, accurate and clear. Seals, caps, and pneumatic accessories for electric valves should be fully intact. The insulation jacket should be free from dents and cracks.
It is not allowed to beat, stand or support heavy objects on the electric valve in operation; in particular non-metallic electric valves and cast iron electric valves must be prohibited.
Classification of electric valves
1. Valves for oil and gas wellhead devices
Valves for oil and gas wellheads are mainly single gate or double gate plates complying with US API 6A standards, forged steel parallel gate valves with diversion holes or diversion holes, mud valves, angular throttle valves, and oilfield-specific parallels. Type control valve, oilfield special straight-through check valve, water injection\polymer special parallel gate valve, clamp type parallel gate valve, pilot type safety valve and check valve.
The nominal pressure levels of electric valves for oil and gas wellhead devices are API2000psi, 3000psi, 5000psi, 10000psi, 15000psi, 20000psi; nominal diameter is DN46~228mm (113/16in~9in); temperature grade is K (-60~182°C) ), L(-42~182°C), P(-29~182°C), R(room temperature), S(-18~166°C), T(-18~182°C), U(-18~121°C) ), V (2 ~ 121 °C); material requirements for AA, BB, CC, DD, EE, FF, HH; material performance requirements by 36K, 45K, 60K, 75K; product technical requirements by PSL1 (product specification level 1) , PSL2 (Product Specification Level 2), PSL3 (Product Specification Level 3), PSL4 (Product Specification Level 4).
2. Valves for long-distance pipelines for oil and gas
Valves used in long-distance pipelines for oil and gas are mainly single or dual gate plates that meet US API 6D standards, flat gate valves with or without diversion holes, and forged or cast steel three-body, top-mounted or all-welded valves. Fixed ball valves; oil seals or pressure balanced plug valves; swing-open or butterfly check valves, ball check valves, pigging valves, etc.
The nominal pressure levels of these electric valves are 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); fireproof test technology requirements according to ISO10497; electric valve pressure test according to ISO5208.
3. Nuclear power valve
Electric valves used in nuclear power have higher technical characteristics and requirements than conventional electric valves used in large-scale thermal power stations. Valves generally include gate valves, globe valves, check valves, butterfly valves, safety valves, main steam isolation valves, ball valves, diaphragm valves, pressure reducing valves, and control valves; the highest technical parameters of typical electric valves are: maximum diameter DN 1200mm (Nuclear level 3 butterfly valve), DN800mm (core 2 main steam isolation valve), DN350mm (core level 1 main circuit gate valve); maximum pressure: about 1500 pounds; maximum temperature: about 350°C; medium: coolant (Borated water) and so on. The requirements for the production of nuclear-grade electric valves are generally based on the nuclear industry standard EJ, the American ASME, the IEEE standard, and the RCC-M design and construction rules for French pressurized water reactor nuclear islands.
The specific types and parameters of nuclear power valve development are as follows:
(1) Gate valve without stuffing box:
a Hydraulically actuated gate valve. The valve uses its own pressure water to push the piston to open or close. The valve nominal diameter: DN350, 400mm; working pressure: PN17.5MPa; working temperature: 315°C. b fully enclosed electric gate valve. The valve should adopt a special screen-closed motor, through the inner planet deceleration mechanism to make the gate open and close movement. The valve nominal diameter: DN100 ~ 800mm; working pressure: PN2.5 ~ 45.0MPa; operating temperature: 200 ~ 500 °C.
Note: The advantages of the two types of non-filling-gate valves mentioned above are: no packing seals, avoiding leakage points, and at the same time, reducing energy consumption. Disadvantages: complex structure and high cost.
(2) Nuclear power shutoff valve:
Used to stop the valve on the line. The valve is usually of three configurations, namely a packing-type stop valve, a bellows-type stop valve, and a metal diaphragm type stop valve. The valve medium is medium parameter (medium temperature, medium pressure) water and steam; nominal diameter: DN10~150mm.
(3) Butterfly valves for nuclear power:
Butterfly valve in systems for cooling system and containment air media in containment. The valve is usually of three structures, namely a coaxial direct-lined rubber-lined butterfly valve, an eccentric metal-sealed butterfly valve, and a double-acting type (the butterfly plate is first released from the sealing surface and then revolved before turning) a metal-sealed butterfly valve. The valve nominal diameter: DN ≤ 2500mm; working pressure: PN <4.0MPa; operating temperature: 100 ~ 150 °C. In addition, the quick-closing butterfly valve used in the air duct system has a nominal diameter of DN400~1200mm, which is also listed as the development direction.
(4) Pilot operated safety valve with detector for nuclear power:
Piloted pilot operated safety valve for nuclear island systems. The pilot-operated safety valve with detector can be used to change the principle of the position control release and the two contacts of the charged medium according to the sensitive relationship between the pressure and the balance of the spring force, so as to avoid the jamming problem from the structure. The valve adopts positive acting spring valve with poppet and bellows seal to ensure reliable sealing. The valve nominal diameter: DN600mm; working pressure: PN1.265MPa.
(5) Non-return valve isolation valve for nuclear power:
A check valve type isolation valve for a steam system is similar in structure to a lift check valve. The valve nominal diameter: DN64 ~ 800mm (21/2in ~ 30in); working pressure: PN1.0 ~ 42.0MPa (Class600 ~ 2500); operating temperature: -29 ~ 1050 °C.
(6) Main steam isolation valve for nuclear power
Main steam isolation valves and main water supply electric valves for nuclear islands and conventional islands. Their nominal diameter: DN800mm; Nominal pressure: 40.0MPa; Temperature 700°C;
In addition, safety valves that meet seismic requirements are also urgently needed for the development of nuclear electric valves.
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