Songxia pneumatic butterfly valve - spring damping pneumatic butterfly valve - hanging rubber pneumatic butterfly valve manufacturer
The spring pneumatic butterfly valve industry has existed abroad for more than 100 years, while the domestic pneumatic butterfly valve industry is still in its infancy, lacking standards and specifications. After the market demand has emerged in recent years, a large number of pneumatic butterfly valve manufacturers have participated, with mixed production and quality, and many fake and inferior products filling the market. Customers who do not understand pneumatic butterfly valves are likely to be tempted to buy low-quality products at low prices. What are the characteristics of high-quality spring pneumatic butterfly valve products?
1、 The structural design is reasonable. At present, the mainstream spring pneumatic butterfly valve products in the international market are: free spring pneumatic butterfly valve, limit spring pneumatic butterfly valve, and side limit type. No matter what kind of structure, it is necessary to prevent rigid connection between structures to transmit vibration, and it is better to have a height adjustment design.
2、 The surface rust prevention treatment shall be in place to ensure the service life of spring pneumatic butterfly valve. At present, the surface treatment of mainstream pneumatic butterfly valves includes hot-dip galvanizing, paint baking, spray painting, plastic spraying, etc. Zinc pad and baking varnish are preferred.
3、 The rubber parts have outstanding performance. Many spring pneumatic butterfly valves are equipped with rubber anti vibration elements. High quality spring pneumatic butterfly valves have special attention to rubber anti vibration elements at different parts. The bottom cushion is generally of anti-skid design, with soft and hard combination and long service life; The rubber with side limit is generally soft and wear-resistant; 4、 The state of the spring can be observed. In order to know when to change. After installation, pneumatic butterfly valve or pneumatic butterfly valve accessories can be changed without requiring shutdown.
5、 The spring is elastic and durable. Under the premise of rated load, it usually has more than 50% of the reserved travel. Only in this way can the spring life be guaranteed. In addition, the number of coils of the spring shall not be less than 6, and the outer diameter of the spring shall not be less than 80% of the compacted height of the spring. Only in this way can the lateral stability of the spring be ensured.
6、 Compact and reasonable structure.

4、 Disassembly process of pneumatic control valve
(1) Cut off the power and air supply; Remove the power line and signal line, and then remove each gas pipe;
(2) Connect the gas pipe (through the pressure reducing valve and positioner to the diaphragm head), and set the pressure of the pressure reducing valve to the low working pressure value of the spring on the nameplate;
(3) Then remove the split nut, close and remove the air source after removal;
(4) Loosen the pointer block and lock nut;
(5) Loosen the bracket round nut and take down the bracket;
(6) Loosen and remove the bonnet nuts diagonally, and take down the upper bonnet, valve core, guide sleeve and toothed gasket in turn; After disassembly, check the cause of failure and reconnect the valve core and valve rod. Then assemble the valve body in the reverse order of disassembly