1、 Features of pull rod welded pneumatic ball valve
1. The valve body structure is integrally welded, without external leakage.
2. The valve seat is composed of PTFE sealing ring and spring, which has strong adaptability to pressure and temperature changes, and will not produce any leakage within the scope of use.
3. The anti leakage structure of the valve rod, the bottom of the valve rod has one PTFE self sealing gasket and one O-ring, and the top is composed of two O-ring and two PTFE gaskets to ensure no leakage.
4. The valve body is made of the same material as the pipeline, so there will be no uneven stress, nor will it be squeezed and deformed due to earthquake and when the vehicle passes the ground.
5. The valve body is light and easy to keep warm.
6. The directly buried pneumatic ball valve can be directly buried underground, instead of building a high atmospheric dynamic ball valve well, it only needs to set a small shallow well on the ground, which greatly saves construction costs and project time.
7. The length of the valve body and the height of the valve stem can be adjusted according to the construction and design requirements of the pipeline. The pull rod welded pneumatic ball valve is a very competitive product both in terms of performance characteristics and function value. Because the pull rod welded pneumatic ball valve can be directly buried underground, it does not need to build a high air operated ball valve well to reduce project cost, and it can also avoid personal injury when operating the pneumatic ball valve. The welded pneumatic ball valve can operate reliably for a long time, Under the condition of normal operation of pneumatic ball valve, the warranty period is 20 years. Maybe its development will be more unexpected in the future.

Application of three-dimensional spherical compensator and elastic sleeve compensator
The three-dimensional spherical compensator is composed of two spherical construction elements and a sleeve construction element. The spherical structural element is subject to angular displacement of radial deflection, and the sleeve structural element is subject to axial linear displacement.
The spherical construction element and the sleeve construction element can be independently installed. When the device is independent, the spherical construction element can handle the pipeline bending compensation, and the sleeve construction element can handle the pipeline axial expansion compensation.
When two spherical construction elements and a sleeve construction element are combined, an elbow joint structure that can simultaneously absorb three-dimensional shrinkage is formed.
The three-dimensional spherical compensator has large deflection angle, large axial displacement and can effectively absorb the large downward displacement of the boiler.
When the three-dimensional spherical compensator is selected, such as the degree device, it mainly absorbs the downward displacement of the boiler, that is, the angular displacement of the three-dimensional spherical compensator. At this time, the three-dimensional spherical compensator with large angular compensation and small axial displacement should be selected. On the contrary, the vertical device mainly absorbs the downward displacement of the boiler; That is, three-dimensional spherical compensation for axial displacement. At this time, three-dimensional spherical compensator with small angular compensation and large axial displacement should be selected.
The preparation specification of three-dimensional spherical compensator is DN200~DN600, totally 9 kinds; The preparation specifications are as follows: 18 ", 20", 22 ", 24", 26 ", 28", 30 "32" in English; According to the length, the preparation specifications are: 1200~3000, 5 kinds in total; The total specifications are 85.
technical parameter
Displacement value: angular displacement ≤ 4~± 12 °, axial displacement 50mm~300mm Working temperature: ≤ 220 ℃ and 220 ℃~450 ℃.
Please increase the length of compensator and reduce angle compensation as much as possible during design and model selection. 2/3 of the radial compensation is generally selected as the design cold drawing value; The selection of compensation angle can be found in the selection parameter table.
Elastic sleeve compensator, also known as tubular expansion joint, is the compensation installation of hot fluid pipeline.
The structure of elastic sleeve compensator is mainly composed of sleeve (core tube), shell, sealing materials, etc. It is used to compensate the axial expansion and contraction of the pipeline and the axial rotation of arbitrary angle. With small volume and large compensation, it is suitable for hot water, steam, grease and other media. Through the sliding movement of the outer sleeve, the sliding sleeve can compensate for thermal shrinkage.
The elastic sleeve compensator is also a compensator that is directly installed in any pipeline that delivers non corrosive unidirectional or multidirectional fluid. This product has good comprehensive performance, so it can also be widely used in the pipeline of urban heating, metallurgy, mining, power generation, petrochemical, construction and other industries. The elastic sleeve compensator has a long service life, and its fatigue life is equivalent to that of the pipeline. After special treatment, the sliding surface has good corrosion resistance in salt water, salt solution and other environments, more than 50 times higher than austenitic stainless steel. At the same time, if the sealing effect is weakened due to wear many years later, the flange can be tightened again to strengthen the sealing performance, or the bolt can be loosened, the pressure ring can be removed, and then one or two layers of sealing rings can be installed, and the pressure ring can be tightened for further use.