How does the globe valve work? Valve tips: Teach you to identify the quality of butterfly valve and common globe valve types

How does the globe valve work? Valve tips: Teach you to identify the quality of butterfly valve and common globe valve types

For example, consider a large tank with a lid. Water enters the tank and exits the cylinder head. The cylinder head acts as the closing part of the valve. If the hand goes up to the cylinder head, it is equivalent to the working principle of the stop valve. If you move the cylinder head around, it works the same way as a stop valve.
For example, consider a large tank with a lid. Water enters the tank and exits the cylinder head. The cylinder head acts as the closing part of the valve. If the hand goes up to the cylinder head, it is equivalent to the working principle of the stop valve. If you move the cylinder head around, it works the same way as a stop valve.
Key specifications:
1. Design specification: GB/T 12235
2. Connection specification:
1) BW for butt welding end: press GB/T 12224
2) Flange end RF: press JB79; GB/T 9113; HG20592
3, valve detection and experiment :GB/T 13927; JB/T 9092
Use the following construction:
Open bar support frame type
Screw connected single flow valve; Gas pressure self-tightening single flow valve
One piece upper sealing seat
A:
The opening and closing parts of the globe valve are cylindrical disc, and the protruder surface is planar or spherical. The valve disc moves uniformly along the fluid axis in a straight line. The movement mode of the valve stem, there are electric push rod type (valve stem adjustment, spindle does not adjust), and adjusting rotary rod type (spindle and valve stem rotation lifting, bolt built on the oil plate). The globe valve is only for opening and closing, customized can be adjusted and throttle valve.
When the globe valve is opened, the relative height of the disc opening is 25% ~ 30% of the outer diameter, the total flow has reached a very large, indicating that the valve has been more than fully open position. Therefore, the full open position of the globe valve should be determined by the disc stroke.
Valve tips: Teach you to identify the quality of butterfly valve and common globe valve type valve sealing material and its sealing leakage level are the main parameters to identify the level of the index value of the valve. Valve is not good or bad, unique working condition application valve can be used for a long time can also be used for a very short time. So don’t judge by the merits. It depends on a combination of working conditions. Plunger globe valve: This way the globe valve is a variation of the basic globe valve. In this valve, disc and high pressure gate valves are usually customized according to the plunger rationale. The disc is polished into a plunger and connected to the stem. The seal is achieved by two elastomer rings sucked into the plunger.
Identify the quality of butterfly valve
The tightness of the valve is to test the valve. Can achieve the most perfect sealing depends on the valve material, manufacturing process, manufacturing process and the working condition used.
The sealing material of the valve and its sealing leakage level are the main parameters of the index value to identify the height of the valve. Valve is not good or bad, unique working condition application valve can be used for a long time can also be used for a very short time. So don’t judge by the merits. It depends on a combination of working conditions.
The butterfly valve opening and closing part is a disk shaped butterfly plate, which rotates around its unique center line in the valve body to open and close or adjust the valve called the butterfly valve. The butterfly valve is generally less than 90 degrees from opening to closing. The butterfly valve and the butterfly rod are not locked strongly. In order to position the butterfly plate, a planetary reducer should be installed on the valve stem. The choice of planetary reducer, not only can make the butterfly plate with locking level, so that the butterfly plate terminates in a random position, but also can improve the operating characteristics of the valve.
The characteristics of industrial production butterfly valve can be heat resistant, available working pressure category is also relatively high, the nominal diameter of the valve is large, the solenoid valve is manufactured with carbon steel, the valve plate sealing ring is made of metal instead of rubber ring. Large and medium-sized continuous high temperature butterfly valves are manufactured by welding iron plates, mainly used in continuous high temperature medium smoke duct and fuel pipeline.
Common globe valve types
1, Angle globe valve in the Angle globe valve, the liquid only needs to change the orientation once, so that the gas pressure through the valve is smaller than the basic structure of the globe valve.
2, DC type globe valve in the direct flow and Y-shaped globe valve, the gate of the oil channel plate and the main flow path into a slash, the flow level is lower than the basic globe valve, so according to bamboo Ze valve flow resistance also corresponds to the smaller.
3, plunger type globe valve: this way of the globe valve is the deformation of the basic globe valve. In this valve, disc and high pressure gate valves are usually customized according to the plunger rationale. The disc is polished into a plunger and connected to the stem. The seal is achieved by two elastomer rings sucked into the plunger. The two elastomeric seals are separated by a clasp and are compacted around the plunger by a load added to the single flow valve by the single flow valve nuts. Elastoseals are removable and can be made of a variety of materials. The valve is mainly used to “open” or “close” the valve, but specially designed plungers or special clasp can also be used to adjust the valve.