Since its introduction in 1971, the Manley valve has set standards that have revolutionized the compressor valve industry.
Once considered radical novelties, the unique features of the Manley valve (and the dramatic successes they have produced) have now been widely imitated throughout the world. The reliability and efficiency improvements delivered by the Manley valve are the result of several proven principles:
Radiused, concentric discs provide more efficient gas flow
Aerodynamic flow reduces the resistance incurred by the gas as it passes through the valve. This streamlining effect is the same principle behind the rounded edges in modern automotive design and significantly reduces the energy required to force gas through the valve. Lower energy costs often result in the valves paying for themselves in a matter of months.
Smooth flow path produces fewer restrictions
Conventional flat-plate designs force the gas to make two 90° turns before passing through the valve. More importantly, any foreign materials in the gas (liquids, dirt, mechanical debris, etc.) must also follow this path. At 300 rpm, these materials have less than 1/10th of a second to pass through these turns. As a result, these inclusions often squarely strike the valve plate at full speed and result in premature failure. These same materials pass through the Manley valve with minimal impact on the radiused disc.
Thermoplastic discs seal better than metallic plates
Foreign debris and normal wear cause metallic plates to lose sealing capability over the life of the valve. Thermoplastic discs actually begin to conform more closely to the valve seat due to their flexibility. In fact, Manley valves will usually seal better after one year of operation than when they were first installed.
Manley discs absorb more force than any other design
The combination of aerodynamic flow, thermoplastic materials, and increased disc mass minimizes the damage inflicted by foreign debris. The aerodynamic flow (and the radiused disc) prevents these inclusions from striking a flat surface head on. This reduced impact force is further compensated for by the resilience of the thermoplastic discs. Finally, the increased thickness of the Manley discs allows them to withstand higher impact forces than conventional designs. Many customers have proudly sent in used Manley discs which have absorbed metal debris as large as 2 to 3 mm without failure or loss of sealing.
Every valve is completely custom designed
Other valve companies only modify the lift and spring selection for a standard line of valve sizes. Parameters such as flow area, spring force, clearance volume, and lift area have minimal or no adjustment for each application. Every Manley valve is designed to exactly match the needs of a unique application.
External dimensions are identical to existing valves, so no modification of the cylinder or restraints is necessary. The internals, however, vary according the operating conditions. Therefore, a 9-inch valve can have any amount of flow area, from a single disc to as many as five or six, with almost any amount of spring force. This is true custom design.
Manley compressor valves are available through Cook’s extensive representative network, or as an upgrade to standard valve designs on many new compressor packages.