American Conval bellows seal valve

Convo Bellows Sealing Valve&'s bellows sealing valves can meet all strict requirements and ensure the service life of bellows.
■The lowest life cycle cost in the industry
■ Fugitive emission grade seal
■ High cycle bellows
■ Online maintenance
Standard bellows seal dimensions
Its maximum size is
Pressure class
Pressure class up to
Standard forged materials

Other materials available on request
Accessories
Actuator electric, pneumatic or hydraulic
Locking device open, closed or two-way
Limit switch one-way or two-way
Valve stem sleeve
Valve position indicator
No leakage port
Design features of bellows seal valve
Comparison of bellows seal valve and packing seal valve
Packing seal valve has two sealing boundaries, stem surface sealing and Stuffing box wall seal. Bellows-sealed valves eliminate both leak paths. When packing seal valves cannot reliably control gas or harmful liquid leakage, bellows seal valves should be used. In all applications, nickel-chromium iron welded bellows stem seals are more reliable than ordinary sliding stem seals.
Zero Fugitive Emissions
Before conducting the valve body and valve seat leakage test, each bellows assembly must pass a zero leakage test with a nitrogen gas spectrometer. The bellows seal emitted no detectable leaks and far exceeded the standards of the Fugitive Emissions Testing Protocol method.
Bellows No Twist
The sturdy, non-rotating poppet stem system prevents damaging twisting, resulting in a long bellows-sealed valve life due to its advanced bellows design.
Three types of valve bodies
Bellows seal valves have three types of valve bodies: angle type and type.
Low Operating Torque
Manual bellows seal valves are equipped with a robust bearing system and grease nozzles to minimize operating torque over the entire service life of the valve.
Double Auxiliary Seats
When the valve is fully open, the bellows seal valve is equipped with a high-performance back seal that acts as a secondary stem seal to separate the valve from the process medium. The balance shaft packing gland and integral packing gland wrench used apply precise load to the stem graphite packing seal to provide a superior seal as a reliable backup to the bellows seal.
Extend the service life of the valve seat
Since the valve seat and valve plug are made of strong cobalt chromium material, this ensures that the valve seat and valve plug can still close tightly during a very long service life, that is, It is used in working conditions with high valve opening and closing cycles and high flow rates, and can also perform tight closing. Seats made of cobalt-free materials are also available in nuclear and chemical applications.
Flexible Design
Dual height bellows are available to provide the maximum valve flow capacity (value) for each given pipe size. Test port (with water seal packing gland) can be requested.
Axial load packing system
The axial design ensures high concentricity, and also eliminates the side load of the packing, reducing the wear force on the components within the valve. This design feature is critical to the valve's superior performance.
Pressure sealing valve cover
There are no solder joints or gaskets or gaskets between the pressure sealing valve cover and the valve body. This structure is both simple and effective. The integrity of the connection between the valve body and bonnet is achieved through numerous thermal cycle tests.
Single Gland
In harsh environments, the simpler the design and the fewer parts, the better the performance of the valve. Durable one-piece stainless steel gland ensures valve longevity.
Pressure type upper seal
The pressure type upper seal greatly improves the integrity of the valve and ensures that the valve stem and valve core assembly actively stop at the limit position. The pressure-type upper seal protects the packing from pipeline pressure when the valve is fully open, extending the life of the packing.
Quick Online Repairability
The valve is easier to repair than any valve on the market. Valve online maintenance provides modular solutions, which will lead to increased maintenance costs. Low valve acquisition cost is less important than low life cycle cost. Maintaining valves is far easier and less expensive than replacing competitor valves