Bellows seal valves are valves employed in piping systems to safeguard against leakage. When selected and installed properly, they minimize the risk of potentially harmful chemicals causing injury or illness to workers and damage to the surrounding environment.
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Sizes through 4&#;
Through ASME Class through #
SA 105, SA 182-F22, SA 182-F91, SA 182-F92, SA 182-F316
Other materials available upon request.
Actuators &#; Electric, Pneumatic or Hydraulic
Locking Devices &#; Open, Closed or Both
Limit Switches &#; Single or Dual
Stem Shroud
Position Indicator
Leak-Off Port
Packed valves require two seal boundaries: a 360° seal on the stem surface and a 360° seal on the stuffing box wall. The Conval bellows seal valve removes these two leak paths. Conval bellows seal valves are used when packed valves may not reliably contain light gases or hazardous system fluids. In all applications, the 6-ply Inconel®, welded bellows stem seal is more reliable than sliding stem seals.
Every Conval bellows assembly is tested for zero leakage using a helium gas mass spectrometer before undergoing further shell and seat leakage testing. Conval&#;s bellows seal emits no detectable leakage, well beyond Method 21 Fugitive Emissions Test Protocol.
A robust rising, non-rotating stem system prevents destructive torsion, providing extremely long service life from the advanced bellows design.
Conval bellows seal valves are available in Y-pattern, Angle-pattern, and T-pattern body styles.
The manual bellows seal valve is provided with a rugged bearing system and grease fitting to minimize operating torque over the life of the valve.
In the full open position, Conval bellows seal valves are equipped with a superior backseat, isolating a secondary stem seal from the process fluid. The graphitic stem seal is precisely loaded by Conval&#;s balanced axial gland and Integral Gland Wrench (IGW), providing superb sealing to back up the bellows.
Positive shut-off is achieved over a very long operational life due to the solid cobalt-chrome seats and discs, even in high cycle and high fluid velocity services. A cobalt-free option is available for nuclear and chemical applications.
Conval offers a double height bellows which provides the highest bellows valve flow capacity (Cv) available per pipe size. Test ports (with lantern gland) may also be specified.
The Axial design ensures tight concentricity, which eliminates side loading of the packing and minimizes wear forces on the trim components. This feature is critical for superior valve performance.
The simple and effective pressure seal bonnet provides ready access for servicing with no welds to cut or seal rings or gaskets to replace. The body-to-bonnet joint integrity is maintained through countless thermal cycles.
In extreme environments, the simpler the design and the fewer the parts, the better. The durable single-piece stainless steel gland contributes to the longevity of the valve.
The Clampseal® pressure-actuated backseat provides maximum valve integrity by ensuring a positive internal stop for the valve stem and disc assembly. The pressure actuated backseat also extends packing life by securely isolating the packing from the pressure when the valve is fully open.
The CLAMPSEAL® Valve is much easier to renew than anything else on the market. The CLAMPSEAL® Valve line provides a modular solution to rising maintenance expenses. Low acquisition cost is not as important as low cost over the serviceable life of a valve. Maintaining a Conval valve is far easier and much less costly than replacing a competitor&#;s valve.
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These valves feature an accordion like bellows&#;i.e., the bellows cartridge component, welded to the valve stem and bonnet. During the valve stroke the bellows compress or expand along with the sliding stem&#;s linear motion with little to no friction.
Gate valves, globe valves and ball valves may all be supplied with Bellows should the application require.
These critical components are an essential part of safe fluid system operation in a broad range of industries, including the following:
Below we provide answers to some of the most frequently asked questions (FAQs) regarding bellows seal valves.
The primary function of bellows seal valves is preventing potentially harmful or toxic fugitive emissions which can negatively affect unprotected humans and the surrounding environment. In addition to reducing the risk to employees or the environment, these valves decrease the amount of material lost during operations, which translates to lower overall material costs and greater throughput.
When selecting a bellows seal valve for a system, there are several factors to keep in mind. Some of the key design considerations are:
Bellows seal valves are built for reliable operation. While rare, failures do occur. Generally, the root cause of the failure stems, not from the quality of the valve or bellows, but from improper selection, installation, or operation. Some guidelines for avoiding valve failure include:
For all your bellows seal valve needs, turn to the valve experts at Conval, Inc. Since our founding in , we have developed a reputation as a premier manufacturer of high-pressure/temperature, forged steel valves suitable for use in the most demanding severe service applications. Our commitment to quality translates to our products&#; superior durability and performance at the lowest life-cycle cost in the industry.
For additional information about our valve offerings or assistance specifying one (or hopefully many) for your application, contact us today.
There is a limitation to the valve diameter because of the internal pressure of the flow media. Globe valve manufacturers limit the size to Nominal Pipe Size (NPS) 12 or Nominal Diameter (DN) 300. Beyond these ranges, when under pressure, the valves may not open or close easily.
When dealing with throttling and high pressure that is beyond 200 psi, valve trims tend to fail. In situations like this, it is better to request a specialized valve trim.
P-T rating refers to the rating of the highest pressure and temperature ratio the valve can handle in relation to the metal material.
As temperature increases, the capability of the body to handle pressure declines. In addition, the seat material and design determine the overall rating.
Most globe valve manufacturing companies use the overall rating dictated by ANS, ie. the body pressure rating at 100°F.
The medium type is one of the most important considerations when buying a globe valve. There are many kinds of media which may or may not be suitable for certain valve designs.
For example, slurries are not suitable medium as they are heavier and contain larger components that could be left behind. These, in turn, can damage the disks. Furthermore, such viscous material can create a huge pressure drop.
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