Production of straight stroke piston pneumatic oxygen shut-off valve and shut-off valve

YJ641WDirect stroke piston pneumatic oxygen shut-off valveProduct Description

This utility model is not limited to the above embodiments. Anyone should be aware that any structural changes made under the inspiration of this utility model, and any technical solutions that are the same or similar to this utility model, fall within the scope of protection of this utility model. As a type of globe valve, it is also operated by pneumatic actuators, usually in fully open or fully closed mode. Therefore, from the perspective of flow characteristics, both pneumatic globe valves and ball valves have the characteristics of short opening and closing stroke, fast speed, and reliable sealing. In the static opening and closing mode, the torque of pneumatic globe valves is relatively small, so these two types of products have corresponding application fields. However, from a reliability perspective, the current mainstream product is still the pneumatic globe valve.

The cylinder of the pneumatic globe valve is a standardized product seat valve, which is divided into single acting and double acting according to the action mode. The single acting globe valve is equipped with a reset cylindrical spring, which has the function of automatically resetting in case of pneumatic failure. That is, under the action of the spring, the cylinder push rod is driven to return to the initial position of the cylinder. 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. Due to the absence of a reset spring, double acting cylinders have greater thrust compared to single acting cylinders of the same diameter, but do not have automatic reset function. Obviously, different intake positions cause the push rod to move in different directions. When the intake position is in the back chamber of the push rod, the intake causes the push rod to move forward, which is called a positive action cylinder. On the contrary, when the intake position is on the same side as the push rod, the intake causes the push rod to retract, which is called a reactive cylinder. Pneumatic globe valves usually use single acting cylinders because they require air loss protection function.

This utility model relates to the field of valve technology, specifically to an oxygen shut-off valve. The utility model provides an oxygen shut-off valve, comprising a valve body, a valve cover, a bracket, an inlet and an outlet. The connecting end face of the valve cover is provided with a convex platform, and the corresponding position of the valve body is provided with a groove. The valve also includes an actuator, which is connected to the valve stem through a gear transmission device. The valve stem is set in the bracket and penetrates the bracket to the valve body. The valve stem and the valve body are connected by threads;

This utility model is not limited to the above embodiments. Anyone should be aware that any structural changes made under the inspiration of this utility model, and any technical solutions that are the same or similar to this utility model, fall within the scope of protection of this utility model. The technical problem to be solved by this utility model is the inconvenience of opening and poor sealing of the existing oxygen shut-off valve. A straight stroke pneumatic actuator comprising a cylinder, a cylinder seat, an end cover, a piston, a piston rod, the top surface of the cylinder being covered by the end cover, the cylinder seat being installed on the bottom surface of the cylinder and communicating with the cylinder, the piston being installed inside the cylinder, the piston rod passing through the piston, the top end fixed to the center of the bottom surface of the end cover, and the bottom end passing through the cylinder seat; The bottom surface of the piston is also equipped with an indicator rod; There is an indicator rod through-hole on the upper end face of the cylinder seat, and a sealing seat is installed inside the indicator rod through-hole. The bottom end of the indicator rod extends out of the cylinder; The bottom of the indicator rod is equipped with a pointer seat, which is fitted with a pointer; A support plate is installed on the bottom surface of the upper end of the cylinder seat; The surface of the support plate is marked with a scale Realize the use of pointers to indicate the switch position or proportion of actuators and facilitate observation

In order to solve the above technical problems, the technical solution adopted by the present utility model is to provide an oxygen shut-off valve, comprising a valve body, a valve cover, a bracket, an air inlet and an air outlet. The connecting end face of the valve cover is provided with a convex platform, and the corresponding position of the valve body is provided with a groove. It also includes: a straight stroke pneumatic actuator, comprising a cylinder, a cylinder seat, an end cover, a piston, a piston rod, the top surface of the cylinder is covered by an end cover, the cylinder seat is installed on the bottom surface of the cylinder and is in communication with the cylinder, the piston is installed inside the cylinder, the piston rod passes through the piston, the top end is fixed at the center of the bottom surface of the end cover, and the bottom end passes through the cylinder seat; The bottom surface of the piston is also equipped with an indicator rod; There is an indicator rod through-hole on the upper end face of the cylinder seat, and a sealing seat is installed inside the indicator rod through-hole. The bottom end of the indicator rod extends out of the cylinder; The bottom of the indicator rod is equipped with a pointer seat, which is fitted with a pointer; A support plate is installed on the bottom surface of the upper end of the cylinder seat; The surface of the support plate is marked with a scale Realize the use of pointers to indicate the switch position or proportion of actuators and facilitate observation

A straight stroke actuator is a type of actuator that uses compressed air as power to complete the execution action. It can open a series of valves with straight stroke opening, such as gate valves, globe valves, slurry valves, etc. There are two types of actuators: double acting and single acting. Double acting actuators are driven by air source pressure for both opening and closing; A single acting actuator is driven to open or close by air source pressure, while another action is driven to return by spring force. The control mode of the actuator can be selected between switch type and regulating type according to the requirements of the operating conditions. The actuator is usually an integrated structure, and the actuator and the regulating mechanism are a unified whole.

2、 Structural characteristics

1. The actuator cylinder tube is made of high-quality aluminum alloy with a grinding tube (for actuators with a diameter greater than 300, a grinding steel tube is used), which has undergone hard anodizing treatment, is sturdy and durable, and has high output efficiency.

2. The surface of the piston rod is pre rolled and hardened, plated with hard chromium, and finely ground to have good wear resistance, rust prevention, and other characteristics.

3. The sealing ring is made of special rubber products, which can work without oil lubrication, with low starting pressure and long service life.

4. The front end cover of the actuator is equipped with oil containing bearings with low friction coefficient. The overall treatment adopts electric melting anti-corrosion technology, which is beautiful and durable.

5. According to the requirements of the working conditions, the stroke end buffer and actuator stroke can be adjusted mechanically; And it can be equipped with a handwheel mechanism to achieve on-site emergency operation.

Background technology:

In practical use, oxygen shut-off valves often require gases such as oxygen, nitrogen, hydrogen, argon, etc. These gases are usually stored in dedicated high-pressure gases. When in use, the gas pressure is reduced to the required range for the experiment through a pressure reducing valve, and then finely adjusted through other control valves to input the gas into the system. As an opening and closing device on oxygen pipelines in the metallurgical industry, oxygen shut-off valves have many particularly strict requirements compared to other general-purpose valves.

Oxygen is a flammable and explosive hazardous material, so it is necessary to prevent leakage, static electricity, and fire flowers to avoid accidents. The existing oxygen shut-off valve disc connection has a form, among which:

(1) When the oxygen shut-off valve is opened, the torque on the back of the valve disc is large, which is laborious, time-consuming, and inconvenient;

(2) The valve cover and valve body are connected by a flat surface, and the sealing performance is insufficient. In view of this, there is an urgent need to improve the structure of existing oxygen shut-off valves to facilitate opening and enhance sealing performance.

IIYJ641WDirect stroke piston pneumatic oxygen shut-off valvePressure test:

3、 Main component materials and performance:

4、 Specification and main dimensions of oxygen pipeline dedicated shut-off valve:

5、 PN2.5MPa-4.0MPa oxygen pipeline dedicated shut-off valve:

6、 Specification and main dimensions of oxygen pipeline dedicated shut-off valve:

The straight stroke pneumatic actuator is powered by compressed air and is a driving device for opening and closing various types of straight stroke valves such as gate valves and globe valves. It is an ideal device for achieving remote centralized or individual control of industrial automation pipelines. The structural principle of a straight stroke pneumatic actuator is that when the gas source enters from the lower pipe of the cylinder body, the gas pushes the piston inside the cylinder body, and the piston rod moves in a straight line, then passes through the valve stem (connected to the valve stem and piston rod) Open the upward movement valve, otherwise, when the air source comes from the cylinder body When the upper pipe mouth enters, close the valve (the cylinder is divided into single cylinder and double cylinder). Precautions for straight stroke with adjustable actuator

1. It is important for the executing agency to be used within the pressure range required by technical specifications;

2. When used beyond the pressure range, the actuator may damage internal components until they fail, and even cause product or personal injury;

3. It is not allowed to remove or dismantle any components when the actuator is under pressure

4. The single acting actuator has a built-in spring, and improper disassembly of the actuator (or spring component) can lead to personal injury;

5. Using the actuator without effective protective measures in a corrosive environment can result in the actuator's lifespan not meeting expectations, and may even damage internal and external components until the actuator fails;

6. If the executing agency is included in a system or used in safety devices and circuits, users should ensure that it complies with national or local safety laws and regulations;

7. The specialized qualifications or work experience required for installation, debugging, maintenance and other related operators;

8. When there is a dangerous state in the environment, it is prohibited to manually operate the actuator;

9. According to the requirements of the working conditions, select appropriate operating tools (such as explosion-proof tools) to install, maintain, disassemble and other operations on the actuator;

Maintenance and upkeep of linear actuator with adjustment

1. The safe separation of actuators and equipment is achieved while ensuring personal and operational safety.

2. Before disassembling any actuator, it is necessary to ensure that there is no pressure in the air chamber (the inlet and outlet holes are empty and unobstructed). Working under pressure can cause personal injury, which is quite dangerous.

3. For spring reset actuators, in addition to meeting the above two requirements during disassembly, it is also necessary to ensure that the spring is in the reset state and the corresponding pre tensioning mechanism has been released.

4. Dismantling personnel must possess relevant specialized skills or pass formal training before they can operate.

5. The internal design of the actuator adopts a self-lubricating structure, and there is no need to maintain the interior of the actuator during daily operation (only when the operating medium meets the requirements). The exterior of the actuator can be protected by cleaning, anti-corrosion and other measures.

6. If the actuator is in a relatively harsh working environment (such as when there are corrosive gases, dust, or harmful substances in the environment), the exhaust hole of the single acting actuator should be protected to avoid the entry of corrosive gases, dust, and other harmful substances. Otherwise, it will shorten the service life of the actuator or even lead to failure.

7. Customers can replace the sealing components of the actuator in real time based on the operating conditions and the operating frequency of the actuator.

The installation and maintenance instructions for linear pneumatic actuators are as follows:

1. The valve stem and piston must be installed coaxially.

2. After installation, the valve and pneumatic device should be tested simultaneously, and they should be flexible up and down without any jamming phenomenon, and the valve should be opened and closed in place.

3. Regularly waterproof and drain the air filter pressure reducing valve of the pneumatic device to ensure its normal operation.

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.