Pneumatic stainless steel globe valve

J641HPneumatic stainless steel globe valveProduct Description

Stainless steel pneumatic globe valve (304, 316, 316L) has the characteristics of short opening and closing stroke, fast speed, reliable sealing, and static opening and closing. It is mainly composed of flange stainless steel globe valve, pneumatic actuator, and other air source accessories. It is an automatic control system that relies on air source to drive the opening and closing of the valve. With the help of compressed air, remote and centralized control can be achieved. The opening and closing speed of the pneumatic globe valve is fast, so it is usually used in applications with high frequency and fast opening and closing time requirements, or in special working conditions that are not suitable for manual control. It is particularly suitable for use in process pipelines without power drive sources in the workplace.

The cylinder of the pneumatic cut-off valve pneumatic control device can be divided into single acting and double acting according to its mode of action. Single acting cylindrical spring with reset function, featuring automatic reset upon loss of air. When the cylinder piston (or diaphragm) loses air, it drives the cylinder push rod to return to the initial position of the cylinder (the original position of the stroke) under the action of the spring. The double acting cylinder does not have a reset spring, and the push rod must rely on changing the inlet and outlet positions of the cylinder air source to move forward and backward. When the air source enters the upper chamber of the piston, the push rod moves downward. When the air source enters from the lower chamber of the piston, the push rod moves upward.

Advantages of stainless steel pneumatic globe valve:

1. Easy and flexible operation, simple structure, easy manufacturing and maintenance;

2. Small work schedule and short opening and closing time; The sealing surface between the closing body (valve disc) and the valve seat adopts conical sealing, which has low closing force, erosion resistance, and reliable sealing.

3. The valve seat can be a replaceable valve seat, which can be freely combined with the sealing surface material of the closing element to meet the working conditions and extend the service life.

It has the characteristics of short opening and closing stroke, fast speed, reliable sealing, and static opening and closing. It is mainly composed of flange stainless steel globe valves, pneumatic actuators, and other air source accessories. It is an automatic control system that relies on air source to drive the opening and closing of valves. With the help of compressed air, remote and centralized control can be achieved. The opening and closing speed of pneumatic globe valves is fast, so it is usually used in situations with high frequency and fast opening and closing time requirements, or in special working spaces that are not suitable for manual control. It is particularly suitable for use in process pipelines without power drive sources in the workplace.

Advantages of pneumatic globe valve:

1. The structure is simple, and manufacturing and maintenance are relatively convenient.

2. Small work schedule and short opening and closing time.

3. Good sealing performance, low friction between sealing surfaces, and long service life.

4. The structural forms of pneumatic globe valve body include straight through, direct flow, and right angle. The straight through type is a common structure, but its fluid resistance is high. Direct flow fluid has low resistance and is commonly used for fluids containing solid particles or high viscosity. Right angle valve bodies are often forged and suitable for globe valves with smaller diameters and higher pressures.

5. The friction force of the sealing surface during the opening and closing process is smaller than that of the gate valve, and it is wear-resistant.

6. Usually there is only one sealing surface, with good manufacturing process and easy maintenance.

J641HPneumatic stainless steel globe valveMain component materials:

Outline dimension table of pneumatic globe valve:

Application of stainless steel pneumatic globe valve products:

The pneumatic globe valve adopts a double acting cylinder, which uses upper chamber intake or lower chamber intake to remotely control the valve, making it easy and flexible to operate. Cylinder media: compressed air, nitrogen. Pneumatic globe valves have a simple structure and are easy to manufacture and maintain; Small work schedule and short opening and closing time; The sealing surface between the closing body (valve disc) and the valve seat adopts conical sealing, which has low closing force, erosion resistance, and reliable sealing. The globe valve can be a replaceable valve seat, which can be combined with the sealing surface material of the closing element to meet the requirements of working conditions and extend its service life.

Working principle of pneumatic globe valve:

Working principle of pneumatic globe valve: Most valves that use compressed air as a power source are remotely controlled, and the action command is manually or automatically triggered by the main control room to activate the intake and exhaust solenoid valves and supply and exhaust compressed air to the actuator. Compressed air acts on the piston or diaphragm, overcoming the frictional force of valve action and the spring force on the valve stem, thereby pressing down (for valve loss opening) or lifting (for valve loss closing) the valve stem, driving the valve core to move up and down, and opening or closing the valve.

Installation and maintenance precautions

1. The shut-off valve operated by handwheel and handle can be installed at any position in the pipeline.

2. Handwheels, handles, and dynamic mechanisms are not allowed for lifting purposes.

3. The flow direction of the medium should be consistent with the arrow direction shown on the valve body.

4. Stainless steel globe valves belong to forced sealing valves, so when the valve is closed, pressure must be applied to the valve disc to force the sealing surface not to leak. When the medium enters valve six from below the valve disc, the resistance that the operating force needs to overcome is the frictional force between the valve stem and the packing, as well as the thrust generated by the pressure of the medium. The force required to close the valve is greater than the force required to open it, so the diameter of the valve stem should be larger, otherwise the valve stem will bend due to failure. In recent years, with the emergence of self sealing valves, the flow of medium has shifted from above the valve disc into the valve chamber. Under the pressure of the medium, the force required to close the valve is small, while the force required to open the valve is large, resulting in a corresponding reduction in the diameter of the valve stem. Meanwhile, under the influence of the medium, this type of valve is also relatively tight. The "Three Modernizations" of valves in our country once stipulated that the flow direction of globe valves should be from top to bottom.

5. The structure of the globe valve is simple, and it can be opened or closed by the principle of the valve stem rotating and lifting, ensuring the sealing and upper sealing function of the valve. Due to the special motion principle of this structure, it also causes extremely unfavorable consequences for the force between the sealing pairs on the valve (forming both the necessary vertical pressure between the sealing pairs and the friction of relative sliding between the sealing pairs). Practice has proven that the upper seal of a valve often only opens and closes a few times, causing leakage due to scratches between the sealing pairs. Minor scratches need to be disassembled for repair, while severe scratches are scrapped due to damage. This not only increases the manufacturing cost of the enterprise, but also affects the performance of the valve. Experiments and improvements were conducted on the structure and materials of the valve seals to address such issues.

Ordering Notice:

1、 ① Product name and model ② Caliber ③ Is there any accessory for us to correctly select for you ④ Operating pressure ⑤ Temperature of the medium used.

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