Analysis of the working principle, advantages and disadvantages of pneumatic valves

Reliable valve stem sealing, the inverted sealing structure of the valve stem can increase with the increase of the medium, once the ball valve is opened and closed, the valve stem only performs a rotating motion, not a lifting motion. The sealing packing of the valve stem is not easy to be damaged. The sealing life of the valve stem is greatly extended.

Long service life, the pneumatic device is more than 60,000 in the destructive test. Because the sealing parts of the ball valve are mostly made of polytetrafluoroethylene and other materials with good self-lubricating properties, the friction and wear of the ball valve and valve stem are very small, which ensures the service life of the valve.

Pneumatic valves are responsive, safe and reliable. Many factories with high control requirements set up compressed air stations for pneumatic instrument control components. Electricity means electricity.

The operating force distance of the pneumatic valve is larger than that of the electric valve. The switching speed of the pneumatic valve can be adjusted. The system is also more complex than an electric valve.

The switch is quick and convenient, and can meet the requirements of fast opening and fast closing of high-altitude dark passages for pipelines.

The fluid resistance is small, whether it is a full-bore type reducing ball valve, it is a kind of small fluid resistance among all valves.

Reliable valve seat seal, ordinary ball seals are made of tetrafluoroethylene type and other polymer materials with better plasticity. In places with higher sealing requirements, soft seals are easier to ensure sealing, metal seals, <hard seal> structure Can withstand 10Npa, 16Npa, 32Npa high pressure and can withstand high temperature 350 ℃ in daily life.

The pneumatic valve has a hygienic structure, no pollution, no dead angle in the valve, no residue, FDA certified sealing material, two types of threaded and welded to choose from, mainly used in the food and pharmaceutical industries. Pneumatic valve size range: thread G1/2-G2 welding DN15~DN43 Pressure range: 0-10bar Fluid temperature: +130'C Body material: stainless steel.

Easy to install, the ball valve is small in size, light in weight, compact in structure, can be installed in any part of the pipeline in any direction, and is also easy to transport and store.

The ball valve is evolved from the plug valve. It has the same lifting action of rotating 90 degrees, the difference is that the cock body is a sphere with a circular through hole or channel through its axis. The ratio of the spherical surface to the channel opening should be such that when the ball rotates 90 degrees, all spherical surfaces should be present at the inlet and outlet, thereby truncating the flow. The ball valve can be closed tightly with only a 90-degree rotation operation and a small torque. The main feature of the ball valve is its compact structure, easy operation and maintenance, suitable for general working media such as water, solvent, acid and natural gas, and also suitable for media with harsh working conditions, such as oxygen, hydrogen peroxide, methane and ethylene.