Check Valves target dual-fuel turbine installations.March 23, 2006 -
Fabricated in 316 SS, CB Series Valves add protection in any system where back flow or pressure might cause damage. They include floating ball with micro-finished surface, Teflon® coated ball cage, and seats fabricated from materials that provide soft sealing surface for bubble-tight shut off and compatibility with fuel oils and amines. Valves come in 3/8, ½, and ¾ in. sizes, and users can select springs for crack pressure ratings spanning 1-120 psi.
(Archive News Story - Products mentioned in this Archive News Story may or may not be available from the manufacturer.)
Original Press release
Parker Hannifin Corp., Instrumentation Products Div. - UK
6035 Parkland Blvd.
Cleveland, OH, 44124
USA
Advanced Check Valves Reduce Costly Maintenance On Dual-Fuel Turbines
Abu Dhabi, January 30, 2006 ---- At Power-Gen Middle East, Parker Instrumentation is showing a unique new family of check valves, specially optimized for the high temperatures and aggressive media found in turbine installations. Now field proven in service at USA dual-fuel power generation installations, the superior performance of the valves can eliminate costly turbine shut downs that can be required for repairs, maintenance, and fuel changeovers.
The CB Series of check valves provides a simple means of adding protection in any system where back flow or pressure might cause a problem or damage. A typical power generation application is as unidirectional protection elements in the fuel oil, purge air or water lines to the combustion chambers of dual-fuel turbines. Currently, such valves are often replaced or refurbished every few months to combat leakage as a result of coking, and/or the perishing of seals because of the aggressive media and the high temperatures (above 250 degrees F/121 degrees C). This can be an extremely costly issue to deal with, especially for those installations that regularly switch between gas and oil - which tends to accelerate problems.
Superior performance and reliability is assured by special features including a floating ball with a micro-finished surface for accurate resealing, a Teflon(r) coated ball cage, and seats fabricated from optimized materials that provide a soft sealing surface for excellent bubble-tight shut off combined with compatibility with fuel oils and amines. These attributes guard against common problems associated with check valves in these environments, including formation of coke deposits, stuck poppets, chattering valves, and micro leakage that can accelerate deposit formation and catastrophic failure.
Fabricated in 316 stainless steel, Parker's CB Series valves are available in 3/8, 1/2 and 3/4 inch sizes (9.5 to 19 mm). Users can select springs for crack pressure ratings spanning a 1 to 120 PSI (0.07 to 8.3 Bar) range. Users may also specify the valves for compatibility with existing systems or preferred installation practices by choosing from integrated single CPI(r) or twin A-LOK(r) ferrule compression tube fittings, NPT, SAE, BSPP or JIC thread connections.
CB Series' body shells will withstand pressures to 3,000PSI CWP (206 Bar). Two types of seating material are commonly specified to suit the application's media and temperature requirements: Parkerfill or Parker Carbon (carbon graphite and carbon reinforced Teflon). These seals are capable of operating at temperatures up to 500 or 550 F respectively (260 or 288 C). Both materials are compatible with fuel oils and amines (ammonia derivatives), and resist coking. Parker Carbon is generally used for higher pressure purge air applications and Parkerfill for water injection and fuel oil lines. Both have been proven successful in dual fuel power generation applications, and are currently in service in numerous installations.
In addition to the standard components and sizes, Parker can supply check valves with application-specific features.
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