Explosion proof pneumatic cut-off ball valve controlled by dual solenoid valves

Q641F Explosion proof Pneumatic Ball Valve

Product Introduction:

Explosion proof pneumatic cut-off ball valve controlled by dual solenoid valvesQ641F-16C Double Electric Control Explosion proof Pneumatic Ball Valve/Double Electric Control Pneumatic Emergency Cut off Ball Valve/Double Electric Control Pneumatic Ball Valve/Double Electric Control Explosion proof Pneumatic O-type Cut off Valve/Q641F-16P Single acting Double acting Explosion proof Pneumatic Stainless Steel Ball Valve/Pneumatic Ball Valve with Handwheel and Manual Control/Explosion proof Pneumatic Ball Valve with Handoperated Mechanism/Pneumatic Switch Type Ball ValveIt is composed of a ball valve, a pneumatic actuator, and other related accessories, which are driven by a gas source to control the opening and closing of the valve. It is equipped with a travel limit switch, dual electric control solenoid valve, pressure reducing valve, and a 0.4-0.7MPa gas source to achieve switch operation, and sends two pairs of passive contact signals to indicate the opening and closing of the valve. Pneumatic cut-off ball valve has excellent sealing performance, large flow capacity, simple structure, long service life, and easy maintenance. The accompanying actuator has the characteristics of simple structure, compact size, excellent performance, and large output torque. There are two types of actuators: single acting and double acting. The advantage of single acting type is that once the power source fails, the ball valve will automatically be in the open or closed position according to the requirements of the control system. Widely used in industrial fields such as chemical, petroleum, textile, power, food and pharmaceutical, refrigeration, papermaking, etc., it can not only control gas, liquid and steam media, but also be suitable for controlling sewage and fiber containing substances. Valve positioners can be installed according to the working conditions, and 4-20mA analog signals can be input to achieve percentage adjustment control of the ball valve opening size.

The difference between single electronic control solenoid valve and dual electronic control solenoid valve:

Single electronic control:There is only one electromagnetic coil, usually used in 2-position three-way solenoid valves, and the coil voltage level is generally DC24V, AC220V, etc. Two position three-way solenoid valves are divided into two types: normally closed and normally open. The normally closed type refers to the air circuit being disconnected when the coil is not powered, while the normally open type refers to the air circuit being connected when the coil is not powered. The operating principle of a normally closed two position three-way solenoid valve is to energize the coil and connect the air circuit. Once the coil is powered off, the air circuit will be disconnected, which is equivalent to "inching". The operating principle of a normally open two position three-way single electric control solenoid valve is: when the coil is energized, the air circuit is disconnected. Once the coil is de energized, the air circuit will be connected, which is also called "inching".

Dual electronic control:There are two electromagnetic coils, usually used in two position five way solenoid valves. The operating principle of the two position five way dual electric control solenoid valve is: when the positive action coil is powered on, the positive action air circuit is connected (the positive action air hole is filled with air). Even if the positive action coil is powered off, the positive action air circuit is still connected and will be maintained until the reverse action coil is powered on. If the reverse action coil is powered on, the reverse action air path will be connected (there is air in the reverse action air hole). Even if the reverse action coil is powered off, the reverse action air path will still be connected and will be maintained until the positive action coil is powered on. This is equivalent to 'self-locking'. Based on the characteristic of two five way dual electric control solenoid valves, when designing electromechanical control circuits or programming PLC programs, the solenoid valve coil can be operated for 1-2 seconds to protect it from damage.

Features:

Pneumatic ball valves are mainly used to cut off or connect media in pipelines, and can also be used for fluid regulation and control. Compared with other types of valves, they have the following advantages:

1. Low fluid resistance, ball valve is one of the types of valves with low fluid resistance, even for reduced diameter ball valves, its fluid resistance is quite small.

2. The thrust bearing reduces the friction torque of the valve stem, which can make the valve stem operate smoothly and flexibly for a long time.

3. The valve seat has good sealing performance, and the sealing ring is made of elastic materials such as polytetrafluoroethylene. The structure is easy to seal, and the sealing ability of the ball valve increases with the increase of medium pressure.

4. The valve stem seal is reliable. As the valve stem only rotates without lifting, the packing seal of the valve stem is not easily damaged, and the sealing ability increases with the increase of medium pressure.

5. Due to the good self-lubricating properties of materials such as polytetrafluoroethylene, the friction loss with the ball is small, resulting in a long service life of the ball valve.

6. The bottom mounted valve stem and the protruding step at the head of the valve stem prevent the valve stem from spraying out. In the event of a fire causing damage to the valve stem seal, the protruding step can also form a metal contact with the valve body to ensure the valve stem seal.

7. Anti static function: Install springs between the ball, valve stem, and valve body to dissipate static electricity generated during the switching process.

The difference between single acting pneumatic actuators and double acting pneumatic actuators:

Single acting and double acting pneumatic ball valves refer to the pneumatic actuators equipped with pneumatic ball valves, which can be divided into single acting and double acting. The difference is that a single acting cylinder has a spring inside, while a double acting cylinder does not. Therefore, the price of single acting pneumatic actuators is higher than that of double acting pneumatic actuators.

Single acting pneumatic actuators are generally divided into normally open and normally closed types (normally open type: ventilation closed, gas cutoff open; normally closed type: ventilation open, gas cutoff closed). That is to say, there is a setting before installation, which sets it as open or closed. If it is normally open, it means that the pneumatic actuator closes the valve under ventilation. If the gas source fails or there is a sudden power outage, the single acting pneumatic actuator will automatically reset to the open state by the spring, which means it will return to its set state. If it is set as closed, it will return to the closed state. It is generally used more in dangerous working conditions, such as transporting flammable gases or liquids, and in emergency situations when the gas source is lost. At this time, single acting pneumatic actuators can automatically reset to reduce danger, while double acting actuators cannot reset.

The double acting pneumatic actuator opens the valve when it is ventilated, and can only be closed when the other side is ventilated. The double acting pneumatic actuator is reset by the cylinder and can only remain in place when the air source is lost.

Performance:

ZSHR/ZSTR pneumatic O-type cut-off ball valve is mainly used for cutting off pipeline media, with good sealing performance and can achieve zero leakage. The ZSHR pneumatic actuator is a double acting type and does not have a reset spring inside. ZSTR pneumatic actuator is a single acting type with a reset spring inside, which can automatically reset in case of gas source failure, ensuring the safety of process equipment. Suitable for suspended particles, viscous media, with low flow resistance and high flow capacity. Pneumatic actuators can be equipped with accessories such as solenoid valves, travel switches, filter pressure reducers, etc. Remote control is very convenient and can provide real-time feedback on the opening and closing of valves on site.

Structural principle:

Pneumatic ball valve is a rotary cut-off ball valve, which is the execution unit in pneumatic unit combination instruments and is generally used in combination with pneumatic components such as solenoid valves. There are two types of valve body structures: soft sealed valve seats and all metal valve seats, which are used for normal temperature (-40~180 ℃) and high temperature (-60~450 ℃) applications, respectively. This product has high transmission efficiency, high thrust, good sealing performance, high rated flow coefficient, and strong interchangeability of parts.

Working Principle:

Pneumatic ball valves are generally used in combination with accessories such as solenoid valves and limit switches. They use pneumatic actuators such as GT, AT, AW, etc., which have high output force, sensitive action, and can effectively open and cut off. Its cylindrical through-hole spherical valve core has shear function, and its effect on controlling viscous media such as fibers and particles is second only to V-shaped ball valves.

Overview of Pneumatic Ball Valve:

Q641F/HPneumatic flange ball valveIt is composed of pneumatic actuators and precision cast ball valves. Mainly divided into pneumatic soft seal ball valves（There are two main categories: pneumatic hard seal ball valves (≤ 200 °) and pneumatic hard seal ball valves (≤ 550 °). It has the advantages of compact structure, small volume, reliable operation, low flow resistance coefficient, good sealing, easy maintenance, convenient installation, and strong adaptability. Pneumatic ball valves can be equipped with travel limit switches, solenoid valves, pressure reducing valves, and 0.4-0.7MPa gas sources to achieve on/off operation, and send two pairs of passive contact signals to indicate the opening and closing of the valve. Widely used in automatic control systems for industries such as petroleum, chemical, teaching equipment, light industry, pharmaceuticals, and papermaking, for remote centralized control or on-site control.

Technical Specifications:

Executor parameters:

Executing Agency:

Adopting GT, AT, AW series pneumatic actuators, with double acting and single acting (spring reset), gear rack transmission, safe and reliable; The large-diameter valve adopts a series of AW type pneumatic actuator fork type transmission, with a reasonable structure and large output torque, and is available in double acting and single acting types.

1. Gear type dual piston, with large output torque and small volume.

2. The cylinder is made of aluminum material, which is lightweight and aesthetically pleasing.

3. Manual operating mechanisms can be installed at the top and bottom.

4. The rack and pinion connection can adjust the opening angle and rated flow rate.

5. The actuator can be equipped with live signal feedback indicators and various accessories to achieve automated operation.

6. The IS05211 standard connection provides convenience for the installation and replacement of products.

7. The adjustable screws at both ends provide a ± 4 ° adjustable range for standard products between 0 ° and 90 °. Ensure synchronization accuracy with the valve.

Options for attachments:

According to different controls and requirements, the following attachments can be selected:

Cut off accessories: single electric control solenoid valve, dual electric control solenoid valve, limit switch feedback device.

Adjustable accessories: electrical locator, pneumatic locator, electrical converter.

Air source processing accessories: air filter pressure reducing valve, air source processing triad.

Manual mechanism: HVSD manual control mechanism

Functions and uses of supporting pneumatic actuators and pneumatic accessories (optional):

1. Double acting actuator: controls the opening and closing of valves.

2. Single acting actuator (spring reset): automatically closes the valve when the circuit air path is cut off or there is a fault.

3. Single control solenoid valve: The valve opens or closes when powered on, and closes or opens when powered off (explosion-proof type available).

4. Dual control solenoid valve: The valve opens when one coil is energized and closes when the other coil is energized, with memory function (explosion-proof type available).

5. Limit switch feedback device: long-distance transmission of valve opening and closing position signals (explosion-proof type available).

6. Electrical locator: Adjust and control the medium flow rate of the valve based on the magnitude of the current signal (4-20mA) (explosion-proof type is available).

7. Pneumatic locator: Adjust and control the medium flow rate of the valve based on the size of the air pressure signal (standard 0.02-0.1MPa).

8. Electrical converter: converts current signals into air pressure signals and is used in conjunction with pneumatic locators (explosion-proof type available).

9. Triple components for air source treatment: including air pressure reducing valve, filter, oil mist device, stabilizing and cleaning the air source, and lubricating the moving parts.

10. Manual operation: Automatic control can manually operate the opening and closing of valves under abnormal conditions.

Material of parts:

Performance specifications:

Structure diagram:

Main external dimensions(Unit: mm)

Henan Maoxing Valve mainly produces and sells【Explosion proof pneumatic cut-off ball valve controlled by dual solenoid valvesQ641F-16C Double Electric Control Explosion proof Pneumatic Ball Valve/Double Electric Control Pneumatic Emergency Cut off Ball Valve/Double Electric Control Pneumatic Ball Valve/Double Electric Control Explosion proof Pneumatic O-type Cut off Valve/Q641F-16P Single acting Double acting Explosion proof Pneumatic Stainless Steel Ball Valve/Pneumatic Ball Valve with Handwheel and Manual Control/Explosion proof Pneumatic Ball Valve with Handoperated Mechanism/Pneumatic Switch Type Ball Valve】We have a large inventory of spot goods available for direct sales at factory prices! We have always adhered to the concept of "reasonable price and thoughtful service", striving to provide reliable products and comprehensive after-sales service for our customers. All text, data, and images in this article are for reference only.