Pneumatic carbon steel globe valve

J641HPneumatic carbon steel globe valveProduct Description

It is mainly composed of flange globe valves connected to pneumatic actuators, pneumatic control components, signal switches, (with optional handwheel mechanism) and other related components. It is an automatic control device driven by compressed air. The pneumatic actuator is driven by the air source to drive the cylinder, and the valve stem, valve core, and valve disc are connected to perform lifting and lowering movements. The valve body (disc) and seat sealing surface of the pneumatic flange globe valve adopt conical sealing, which has low closing force, erosion resistance, and reliable sealing. 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.

Pneumatic globe valve is a type of valve that is equipped with a pneumatic actuator. It is suitable for pipelines of water, steam, compressed air, and various materials, and can accurately regulate flow and tightly block channels. However, it cannot be used for materials with high viscosity and easy crystallization. Its pneumatic actuator can choose between double acting and single acting (spring reset) according to the mode of action, and accessories such as solenoid valves, positioners, limit switches, air source triplets, manual mechanisms, etc. can be configured according to customer on-site needs.

Working principle of pneumatic globe valve:

The axis of the valve stem of the pneumatic globe valve is perpendicular to the sealing surface of the valve seat. The opening or closing stroke of the valve stem is relatively short, and it has a very reliable cutting action, making the pneumatic globe valve very suitable for cutting off or regulating the medium and throttling. Once the valve disc of the pneumatic globe valve is in the open state, there is no longer contact between its valve seat and the sealing surface of the valve disc. And it has a very reliable cutting action, which makes this pneumatic valve very suitable for cutting off, regulating and throttling the medium.

Packing seal of pneumatic globe valve:

Pneumatic globe valves usually use molded flexible graphite as the packing material, and PTFE or composite packing materials can be provided according to user needs. The surface roughness of the contact between the packing and the packing box is 3.2um, which can ensure a tight and free rotation of the valve stem and packing contact surface. The precision machined valve stem sealing surface roughness of 0.8um can ensure reliable sealing of the valve stem.

Pneumatic globe valve actuator:

The pneumatic actuator of flange pneumatic cast steel globe valve is generally divided into two types: pneumatic spring piston type and pneumatic cylinder piston type. The former is a single acting spring reset type, and the latter is a double acting gas closed gas open type. The pneumatic flange globe valve adopts a self sealing working principle. The medium enters the valve chamber from above the valve disc. Under the pressure of the medium, the closing force of the globe valve is small, while the opening force is large. The diameter of the valve stem can correspondingly reduce the impact force of the fluid. At the same time, under the pressure of the medium, this type of valve is also relatively tight. Pneumatic globe valves are generally fully open and fully closed, and it is not recommended to use throttling or regulating valves.

Technical parameters of pneumatic flange globe valve:

Principle of Pneumatic Flange Stop Valve:

Pneumatic globe valves use compressed air to drive multiple sets of combined pneumatic pistons inside the actuator, transmitting force to the crossbeam and inner curved track, driving the hollow core spindle to rotate. Compressed air discs are sent to each cylinder, changing the inlet and outlet positions to change the direction of spindle rotation. According to the required rotational torque of the load globe valve, the number of cylinder combinations can be adjusted to drive the load globe valve to work.

Design standard for pneumatic flange globe valve:

J641HPneumatic carbon steel globe valveMain component materials:

5、 Main technical parameters of J41H cast steel flange globe valve:

6、 Main external dimensions of J41H cast steel flange globe valve:

Note: The above parameters are based on the national standard PN1.6MPa. For other pressure levels, please consult our technical department. In addition, due to product improvement and technological innovation parameters, there may be some changes. Please consult our technical department for the latest data.

It is a valve that uses a valve disc to control its opening and closing. By changing the gap between the valve disc and the valve seat, i.e. changing the size of the channel cross-section, the medium flow rate can be adjusted or the medium passage can be cut off. Attention must be paid to the flow direction of the fluid when installing a shut-off valve.

The principle that must be followed when installing a globe valve is that the fluid in the pipeline passes through the valve hole from bottom to top, commonly known as "low in, high out", and cannot be installed upside down.

What should be noted when installing valves? Let's explain the precautions for valve installation.

When installing the valve, it is necessary to clean the inner cavity and sealing surface, tighten the connecting bolts evenly, and check whether the packing is tightened.

The valve during installation is in the closed state.

3. Large gate valves and pneumatic control valves should be installed vertically to avoid tilting to one side due to excessive weight of the valve core, which can cause leakage.

4. There is a set of correct installation process standards.

5. Valves should be installed in the allowed working position, but attention must be paid to the convenience of inspection and operation.

6. The installation of the shut-off valve should ensure that the flow direction of the medium is consistent with the arrow marked on the valve body. For valves that are not frequently opened and closed, it is necessary to strictly ensure that the valve does not leak when closed, and can be installed in reverse to close the valve through the pressure of the medium..

When tightening the compression screw, the valve should be slightly open to avoid squeezing the top sealing surface of the valve.

8. Low temperature ball valves should be opened and closed as much as possible before positioning in a cooled state, requiring flexibility and no blockage.

9. The liquid valve should be configured to tilt the valve stem at a 10 ° angle relative to the horizontal plane to prevent liquid from flowing out along the valve stem. Even more serious is to avoid leakage.

10. After the air separation tower is almost not cold, the flange of the connecting valve is pre tightened in the cold state to prevent low-temperature leakage and low temperature leakage.

11. It is strictly prohibited to climb the valve stem as a scaffold during installation.

12. After all valves are in place, they should be opened and closed again, flexible and unobstructed, and qualified.

Valves should usually be positioned before installing pipelines. The pipeline should be natural and the position should not be difficult to avoid prestress.

14. Non metallic valves, some are hard and brittle, while others have low strength. When operating, the opening and closing force should not be too strong, especially not to make it sturdy. Also pay attention to object collisions.

15. When handling and installing valves, please pay attention to collision and scratching accidents.

When using a new valve, the seal should not be pressed too tightly to avoid leakage, and the valve stem should not be subjected to too much pressure, accelerating wear and making it difficult to open and close.

Before installing the valve, ensure that it meets the design requirements and relevant standards.

Before installing the valve, the interior of the pipeline should be cleaned to remove impurities such as iron filings, in order to prevent the valve sealing seat from being contaminated by foreign objects.

When installing the high-temperature valve, it is at room temperature. After use, the temperature rises, the bolt expands, and the gap increases, so it must be tightened again. This issue needs attention, otherwise it is easy to leak.

20. Install the valve and confirm whether the flow direction of the medium, installation form, and position of the handwheel comply with regulations.

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.

2、 If the company's model has already been selected by the design unit, please order directly from our sales department according to the model.

3、 When the usage situation is very important or the environment is complex, please provide design drawings and detailed parameters as much as possible, and our valve company experts will review and control them for you. If you have any questions: Please: We will do our best to provide you with high-quality service. We provide comprehensive and professional "valve system solutions" and are also willing to help users solve problems encountered in production.