Lubricated Plug Valve In Natural Gas Application

Lubricated plug valves serve as critical shut-off valves in long-distance natural gas pipelines and station control systems, specifically designed for such applications. These specialized shut-off valves are engineered to meet stringent requirements, capable of stable operation in harsh environments with a service life exceeding 30 years. They achieve bidirectional zero leakage while featuring key technical characteristics such as fire resistance, static dissipation, corrosion resistance against acidic media, and effortless operation.

Le lubricated plug valve features a unique structure comprising components such as the valve body, valve cover, valve stem, plug body, coupling balance ring, valve stem seal assembly, and mounting components. Its ingenious design aims to provide efficient and reliable sealing performance, ensuring the safe operation of natural gas application.

Valve Body Design
The valve body has an inverted bell-shaped structure, cast as a single piece, ensuring high strength and excellent rigidity while distributing stress more uniformly. The valve body, valve center of gravity, and pipeline center are aligned at the same height, significantly enhancing operational stability.

Plug Design
The plug adopts an inverted structure, forged as a single piece and precision-machined, with a sufficiently high surface roughness. Through surface treatment technologies such as nitriding, nickel-phosphorus alloy plating, or hard alloy coating, the surface hardness of the plug is significantly enhanced.

Friction Pair Design
The sealing pair adopts a metal sealing structure supplemented by grease sealing. This design utilizes the filling and positioning characteristics of sealing grease to effectively prevent solid particles in the medium from entering the sealing surface, thereby providing excellent protection for the sealing surface. The lubricating effect of the grease reduces the operating torque of the valve, making operation more effortless.

Valve Stem and Valve Stem Sealing Design
The strength and sealing performance of the valve stem are critical to vanne à clapet stem operation and overall valve performance. The forces acting on the valve stem originate from friction at the packing, operating torque, and medium thrust. To optimize force distribution and operation, we use a slip ring connection to connect the valve stem to the plug, effectively reducing the concentricity error between the valve stem center and the plug cone surface.

Valve Cover and Bottom Structure Design
The valve cover, as the critical pressure-bearing component at the bottom of the valve, not only supports and secures the bottom seal gasket and adjustment rod but also requires excellent stiffness and strength. Its seal design uses an integral seal gasket to achieve a fully isolated structure, ensuring the valve achieves highly reliable sealing when the valve cover bolts are tightened.

Compared to traditional sleeve-type plug valves, lubricated plug valves offer the following significant advantages:

First, reliable sealing and long service life.

Second, low operating effort and torque.

Third, adjustable position and strong adaptability.

Fourth, excellent valve stem sealing design.

The above content is lubricated plug valve in natural gas application, It is provided by ZZJG Valve engineers. If you need to know more about this, please contact ZZJG Valve.