Shanghai engineering quarries ltd. Is a business that produces welding valves。
The welding valve is an automatic valve with a circular valve that acts on its own weight and medium pressure to block the back flow of the medium. The stop valves are in the form of lift-down and spin-off。
The elevation stop valve is similar to the cut-off valve structure, except for the absence of valve-driven valves, where the medium flows from the lower end of the import to the upper end of the export. The valve opens when import pressure is greater than the combined weight of the valve and movement resistance; the reverse is closed。
The respirator has a tilted valve that can be rotated around the axis and works in a similar manner to the up and down valve. The stop valve, which is often used for bottom valves of pumping units, can prevent the water from returning, thereby extending the useful life of the valve。
The ceramic control valves use a three-part structure with dual sealing characteristics, and when choosing the ceramic regulation valves, they should, as far as possible, select valves over-designed with tilts to reduce the impact of the fluids and to extend their useful life。
Corrosive resistant valves are valves for the control of the piped routing system, which alter the direction of the traffic through the circuit and the medium and have conductive, cut-off, regulation, throttle, stop-over, diversion or spill discharge pressure。
Corrosive resistant valves are used to control the movement of various types of fluid, such as corrosive media, liquid metals and radioactive fluids。
The working pressure of the valve can range from zero to 1,000 mpa and the working temperature can range from a very low temperature of 269°c to 1430°c。
Valves are controlled in a variety of ways, such as manual, electric, liquid, aerodynamic, snail, electromagnetic, electromagnetic-liquid, electro-liquid, liquid, gear, umbrella gear, etc., which can act as intended under pressure, temperature or other forms of sensory signal, or are simply opened or closed without relying on sensorial signals。
Valves may rely on a driving or automatic body to achieve arm lifting, suspicion of rotation or rotation, and thus change the size of their fluid area to achieve their control function。
Corrosion resistant valves can be divided into manual, electric, liquid, aerodynamic, snail, electromagnetic, electromagnetic-liquid, electro-liquid, liquid, vacuum valves, etc。
Public pressure by valve can be divided into vacuum valves and low pressure valves, medium pressure valves, high pressure valves and ultra high pressure valves。
• 2. Low pressure valves: valves not exceeding 1. 6 mpa (including pn ≤ 1. 6 mpa steel valves) with a stated pressure。
