Globe Control Valves

Globe Control Valves use linear motion to move the shutoff member in and out of the seat surface. Their bodies feature a spherical cavity around the port area and are designed to regulate process flow when used in conjunction with an actuator assembly. Many single-seat bodies use a cage, three-way or fixed construction to hold the seat ring in place, provide spool guidance, and provide a means of establishing specific valve flow characteristics. Caged or fixed single-seat bodies can also be easily modified by replacing the internals to change the flow characteristics or to provide reduced capacity flow, noise attenuation, or to reduce or eliminate cavitation.

The LN8 series top-guided single-seat control valve is a top-guided, plunger-type single-seat control valve. It was certified by TÜV ISO15848 in 2019. It has the characteristics of high control accuracy, good sealing performance, simple structure and high versatility. Suitable for fluid control in globe control valve working conditions requiring high control accuracy. Bellows seal type can be used. Thousands of applications in the fine chemical, petrochemical, pharmaceutical and other industries.

Performance Advantages of Globe Control Valves

• Modular design combining American and Japanese high-precision control concepts with German modular engineering.

• S-shaped valve body cavity with a smooth flow path and no dead corners; internal guide vanes reduce media interaction, cavitation, flow resistance, turbulence, and vortex formation while increasing flow capacity.

• Simple internal structure with minimal dead space, reducing the risk of medium crystallization and blockage.

• Top-guided valve plug ensures smooth and stable movement.

• Floating valve seat with a tapered sealing surface ensures accurate alignment and reliable sealing.

• Contoured valve plug provides precise flow control, with equal-percentage, linear, and quick-opening characteristics available.

• Wide operating temperature range from −196°C to 593°C, depending on the selected structure.

• Leakage performance complies with GB/T 17213.4-2005 / IEC 60534-4:1999:

• Metal seat: Classes IV and V

• Quick-opening and soft seat: Class VI

• Available connections include RF, RJ, and FM flanges, as well as SW socket-weld and BW butt-weld connections.

• Face-to-face dimensions comply with GB/T 17213.3-2005 / IEC 60534-3-1:2000 or ISA S75.03-1992.

Long Service Life

• Valve trim: Different materials and surface-hardening treatments can be selected for specific operating conditions, improving resistance to corrosion, cavitation, and erosion while extending service life.

• Valve body: The LN8 series uses upper and lower passages to form an S-shaped flow path. Its elliptical cross-section reduces resistance and turbulence, while the guide vane in the upper passage minimizes vortex formation and improves flow capacity.

• Pneumatic actuator: The standard AM8 multi-spring pneumatic diaphragm actuator delivers high output force, reliability, and broad operating compatibility. Output force can be adjusted through the number of springs, while the high-stress-resistant diaphragm supports up to 0.5 MPa air pressure for reliable shutoff.

• Actuator lifespan: Designed for more than one million operating cycles.

Easy to maintain

The unique platform and modul design make it easy to remove and displace the parts without special tools, and moreover, easy to change the type of the valve only by changing few parts. A variety of material combinations is optional for the parts.