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ValvesFlowserve is an industry-leading provider of valves used in a wide variety of global infrastructure industries.
Guardian II Metal Bellows Seal
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- Brands:
Valtek - Applications:
Acid Transfer,Chemical Processing,Chlor-alkali,Difficult-to-Seal Liquids,Inorganic Chemicals,Safety Systems,Toxic Services - Industries:
Volatile Organic Compounds,Leaching Acid,Bleach Chemicals,Acid Transfer - Standards:
- Misc:
The Flowserve, Valtek, Guardian II, and Metal Bellows Seal control valve eliminates valve leakage. Using a formed metal bellows design with minimal welded joints, the Guardian II has a full-cycle life of up to 5 million cycles. This ensures years of safe and reliable operation in hazardous processes ranging from -320°C.
Like Flowserves Mark One globe valve, the Mark Eight features streamlined, constant area flow passages, top-entry trim, a four-way positioner, and a high thrust cylinder actuator. The Mark Eight is completely interchangeable with the Mark One except for the body, seat retainer, bonnet, and plug. The packing box, actuator, seat ring, flanges, and gaskets are all standard, off-the-shelf items for fast delivery and minimal parts inventory.
A metal shroud envelopes the bellows acting as a pressure boundary in service, allowing use of a single, pressurized gasket seal and preventing fluid contact with the bellows housing during normal operation. External pressurization of the bellows increases cycle life and the maximum allowable pressure, while eliminating ?bellows squirm.? The replaceable plug head allows trim changes without changing the bellows assembly.The Guardian II can be retrofitted to a standard Mark One valve by changing the plug and bolting, adding a bellows assembly, bellows housing and lower guide assembly.
Advantages
Like Flowserves Mark One globe valve, the Mark Eight features streamlined, constant area flow passages, top-entry trim, a four-way positioner, and a high thrust cylinder actuator. The Mark Eight is completely interchangeable with the Mark One except for the body, seat retainer, bonnet, and plug. The packing box, actuator, seat ring, flanges, and gaskets are all standard, off-the-shelf items for fast delivery and minimal parts inventory.
A metal shroud envelopes the bellows acting as a pressure boundary in service, allowing use of a single, pressurized gasket seal and preventing fluid contact with the bellows housing during normal operation. External pressurization of the bellows increases cycle life and the maximum allowable pressure, while eliminating ?bellows squirm.? The replaceable plug head allows trim changes without changing the bellows assembly.The Guardian II can be retrofitted to a standard Mark One valve by changing the plug and bolting, adding a bellows assembly, bellows housing and lower guide assembly.
Advantages
- Full-cycle life of up to 5 million cycles
- -320° to 1000° F (-196° to 538° C)
- Pressures up to 1100 psi (75.8 Bar)
- Formed metal bellows design
- Wide selection of materials available
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Guardian II Metal Bellows Seals Technical Bulletin
This Technical Bulletin provides technical details on the application and use of Valtek Guardian II metal bellows seal equipped control valves
Mark One-X
| Description: | The Valtek Mark One-X control valve is designed as an economy measure to permit installation of a small valve in a much larger line without using line reducers or expanders. The valve is a standard Mark One, except for the body, which incorporates expande |
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Mark One Control Valve
| Description: | The Valtek Mark One globe control valve offers superior performance in liquid and gaseous services, while also permitting easy, fast and inexpensive maintenance. The spring-cylinder actuated Mark One valve provides stiffness and maintains high posi |
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Mark Two Control Valve
| Description: | The Flowserve Mark Two control valve, available in many different configurations, is an extremely versatile automatic control valve. Fabricated from bar stock, it can be machined without foundry delays, even in high pressure classes or special alloys. Thi |
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