Production of welded globe valves for pneumatic high-temperature and high-pressure power plants

J661YPneumatic high temperature and high pressure power station welded globe valveProduct Description

This utility model relates to the field of globe valve technology, specifically a globe valve for high temperature and high pressure power plants. High temperature welding globe valve, also known as power station specific globe valve, is characterized by high temperature and high pressure, self sealing design, and more reliable sealing compared to other globe valve products. The higher the pressure, the more reliable the sealing. Due to its unique performance, technical characteristics, and working conditions, the product has also developed unique features that cannot be replaced by other products. The manufacturing and acceptance technical conditions for high temperature and high pressure welded globe valves shall be in accordance with the Japanese standard E101 for valves used in thermal power generation. The structural length of the globe valve for pound scale power plants shall be in accordance with the provisions of E101. The welding groove of the valve body shall be in accordance with the provisions of ANSI B16.25 or the size provided by the user. The valve cover packing box is tried to be reasonable, with corrosion inhibitor added to the packing, reliable sealing, and smooth opening and closing. The welded globe valve in high-temperature and high-pressure power plants has an upper sealing structure to ensure that the valve stem will not leak out when the valve is opened and operated.

A straight stroke actuator is a type of actuator that uses compressed air as power to complete the execution action. It can perform a series of valves such as opening, shut-off valves, slurry valves, etc. that can be opened in a straight stroke. 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. Mainly suitable for cutting off or connecting pipeline media in various systems of thermal power plants. Applicable media: non corrosive media such as water and steam. The characteristics of power station valves compared to other valve products are high temperature and high pressure, self sealing design, and the higher the pressure, the more reliable the seal.

Globe valve, also known as shut-off valve, is a widely used type of valve. Its popularity is due to the low friction between the sealing surfaces during the opening and closing process, its durability, small opening height, easy manufacturing, and convenient maintenance. It is not only suitable for medium and low pressure, but also for high pressure. Valves play an important role in cutting off and throttling the medium in the pipeline they are located in. At present, when cutting off or throttling the medium in the pipeline, the globe valve relies on the pressure of the valve stem to tightly fit the sealing surface of the valve disc and the sealing surface of the valve seat, preventing the flow of the medium. This method has poor sealing performance and the medium is prone to leakage along the gap between the two sealing surfaces, making it impossible to cut off the medium. When used in high-temperature and high-pressure power plants, it has certain risks. In view of this, we propose a shut-off valve for high-temperature and high-pressure power plants.

The national standard power station globe valve is suitable for cutting off or connecting media on pipelines in various working conditions such as petroleum, chemical, and thermal power stations with Class 1500~3500Lb and working temperature of -29~570 ℃. Applicable media include non corrosive media such as water, oil, steam, etc. 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 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).

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.

Structural characteristics of national standard power station shut-off valve:

1. The design and manufacturing of globe valve products shall comply with ASME B16.34 and E101 standards, and can be used in conjunction with imported equipment.

2. The valve chamber adopts a pressure self tightening sealing structure, and the higher the internal pressure, the better the sealing performance.

3. The two ends of the branch pipe are butt welded to meet different requirements for connecting pipes.

4. The sealing surfaces of the valve disc and seat are made of Stellite cobalt based hard alloy by welding, which is wear-resistant, high-temperature resistant, has good scratch resistance, and has a long service life.

5. The valve cover packing box should be tried reasonably, with corrosion inhibitor added to the packing, reliable sealing, and smooth opening and closing.

6. The valve has an upper sealing structure to ensure that the valve stem will not leak out when the valve is opened and operated.

7. The opening and closing of the electric shut-off valve are controlled by an electric device, which is equipped with a dedicated motor, reducer, torque control mechanism, on-site operating mechanism, and manual/electric switching mechanism. In addition to on-site operations, remote operations can also be performed.

National standard specification for globe valves in power plants:

Design and Manufacturing Standards: ASME B16.34, E101

Structural length standard: GB/T 12221-2005

Connection flange standard: GB/T 9113

Pressure and temperature rating: GB/T 12224-2005

Test and Inspection Standard: GB/T 13927-2008

Structural features:

1. The valve chamber adopts a pressure self tightening sealing structure, and the better the sealing performance. The two ends of the branch pipe are welded structures. Welding grooves can be matched according to standards or user requirements.

2. The sealing surfaces of the valve disc and seat are made of Stellite cobalt based hard alloy by welding, which is wear-resistant, high temperature resistant, has good abrasion resistance, and has a long service life.

3. The valve stem has undergone quenching and surface nitriding treatment, exhibiting good corrosion resistance and abrasion resistance.

4. The depth of the valve cover packing box is reasonable, and corrosion inhibitors are added to the packing to ensure reliable sealing.

J661YPneumatic high temperature and high pressure power station welded globe valveProduct Model:

National standard performance specifications for power station shut-off valves:

National standard and specifications for power station shut-off valves:

Main component materials of national standard power station globe valve:

Outline dimension table of national standard power station globe valve:

This utility model relates to the field of globe valve technology, specifically a globe valve for high temperature and high pressure power plants. High temperature welding globe valve, also known as power station specific globe valve, is characterized by its high temperature and high pressure, self sealing design compared to other globe valve products. The higher the pressure, the more reliable the seal. Due to its unique performance, technical characteristics, and working conditions, the product has also developed unique features that cannot be replaced by other products. The manufacturing and acceptance technical conditions for high temperature and high pressure welded globe valves shall be in accordance with the Japanese standard E101 for valves used in thermal power generation. The structural length of the globe valve for pound scale power plants shall be in accordance with the provisions of E101. The welding groove of the valve body shall be in accordance with the provisions of ANSI B16.25 or the size provided by the user. The valve cover packing box is tried to be reasonable, with corrosion inhibitor added to the packing, reliable sealing, and smooth opening and closing. The welded globe valve in high-temperature and high-pressure power plants has an upper sealing structure to ensure that the valve stem will not leak out when the valve is opened and operated.

Mainly suitable for cutting off or connecting pipeline media in various systems of thermal power plants. Applicable media: non corrosive media such as water and steam. The characteristics of power station valves compared to other valve products are high temperature and high pressure, self sealing design, and the higher the pressure, the more reliable the seal.

Globe valve, also known as shut-off valve, is a widely used type of valve. Its popularity is due to the low friction between the sealing surfaces during the opening and closing process, its durability, small opening height, easy manufacturing, and convenient maintenance. It is not only suitable for medium and low pressure, but also for high pressure. Valves play an important role in cutting off and throttling the medium in the pipeline they are located in. At present, when cutting off or throttling the medium in the pipeline, the globe valve relies on the pressure of the valve stem to tightly fit the sealing surface of the valve disc and the sealing surface of the valve seat, preventing the flow of the medium. This method has poor sealing performance and the medium is prone to leakage along the gap between the two sealing surfaces, making it impossible to cut off the medium. When used in high-temperature and high-pressure power plants, it has certain risks. In view of this, we propose a shut-off valve for high-temperature and high-pressure power plants.

In mechanical operation, pneumatic actuators play a crucial role, which requires everyone to understand the installation, commissioning, maintenance, and fault analysis of pneumatic actuators. Only correct installation, operation, and necessary maintenance can achieve the desired effect and application purpose of valve maintenance work.

Installation and debugging

1、 Installation of actuators and valves

After taking the steel cylinder, first check whether the cylinder model is correct and whether the cylinder is open or closed. Generally, it is closed during installation (large-diameter valves can also be installed in the open state)

2. Check the rotation direction of the cylinder, open the valve counterclockwise and close it clockwise.

3. When connecting the cylinder to the valve, check whether the center distance of the cylinder connection hole is consistent with the center distance of the flange connection hole on the valve.

4. Check if the cylinder shaft and valve shaft are consistent. If the shafts are not aligned, add a square sleeve.

5. During installation, the steel cylinder should be in the same state as the valve (be careful not to open and close one by one, otherwise the valve will rotate in the opposite direction).

6. Installation status: (except for special requirements) Butterfly valves and actuators are both installed at a 90 degree angle. The ball valve is installed in parallel with the actuator.

2、 Installation of solenoid valve (as required)

After the installation of the pneumatic actuator is completed, if a solenoid valve needs to be installed, please pay attention to whether the O-ring on the solenoid valve is intact.

2. After installation, check if the exhaust valve is closed. Otherwise, remove the solenoid valve and rotate it 180 degrees for reinstallation (no special requirements (close after installation).

3、 Install the reply device

1. First, remove the screws on the upper indicator cover of the cylinder block, insert the connecting shaft of the receiver into the slot of the intermediate shaft of the cylinder block, and then fix the connecting bolts.

2. Open the earpiece cover and check if the travel stop corresponds to the valve switch. When the valve is fully open, the yellow stops pressing the switch, and when the valve is fully closed, the red stops pressing the switch. When installing the valve cover, the indication on the valve cover should also be consistent with the valve switch.

4、 Debugging

When there is no solenoid valve, first release air from one end and check if the valve's opening and closing positions are in place. If it is not in place, loosen the corresponding limit screw outward, depending on the position of the valve. One is the opening limit price, and the other is the closing limit price. Under normal circumstances, the left exhaust valve of the actuator is open and the right exhaust valve is closed. Limit switches are usually left open limit switches and right closed limit switches (counterclockwise rotation increases travel, clockwise rotation decreases travel) (note: lock after adjustment)

After installing the solenoid valve, first exhaust and check if the valve is completely closed, otherwise check the installation status of the solenoid valve and valve. Use the manual switch on the solenoid valve to debug and check if the valve is in the fully open and fully closed positions. If you need to adjust your itinerary, the method is the same as above.

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.