Yarway 5817 1 1037418

Valves used for throttling services have always been subject to rapid deterioration in the form of erosion, cavitation damage and wiredrawing of vital parts. Even venturi valves and other special configurations are vulnerable. The Hy-Drop® throttling valve embodies a unique concept, which so controls the destructive forces inherent in high pressure drop service that deterioration of parts is virtually eliminated. Rapid energy dissipation is essential to the throttling process and the Hy-Drop® valve actually encourages this at the same time containing its destructive capability. The basis for this concept is in the configuration of the flow path as determined by the shape of the valve disc and seat. Fluid flowing through the annulus between disc and cylindrical seat accelerates smoothly until it reaches the blunt end of the disc. At this point, the flow area increases abruptly at its center and the resulting pressure drop at the core of the flow path causes rapid expansion of the fluid toward the core. Thus, the essential vaporization and turbulence occur at the center, within a layer of unvaporized fluid which continues to flow along and protect the sleeve wall. With this configuration, the vaporization process is so efficient that the vapor formed is momentarily super saturated and the remaining liquid sub-cooled, until equilibrium is re-established a short distance down the sleeve passage.

Yarway Hy-Drop® Throttling Valve, Model: 5817, 1 in Nominal, NPS Connection, Socket Weld End, 1700 psi, 1700 lb Pressure Class, Water Media, 1/8 to 5/8 in Orifice, Alloy Steel Body, Stellate Seat, Stainless Steel Stem, Stellate Disc, Garlock Packing, Iron Handle, T-Handle Operator, AMS 5387, AMS 5385, ASTM A582 Type 416, ASTM A-47 Grade 32510 Material Standard

• Primary range plus a super capacity blast range
• Controls the destructive forces inherent in high pressure drop service
• Micrometer dial assures setting accuracy and positive resetting capability
• Insert an interchangeable stem disc into the same valve body to convert from one orifice size to another
• Eliminates disc vibration and chatter
• Disc design provides multi-position seating and assures positive alignment of seat and disc surfaces. This gives sure protection against premature failures from seat to disc "grind" prevalent in valves of integral stem disc design
• Separate surfaces for shut-off and throttling
• Resists corrosion and wiredrawing
• Yarway reseating tool can be used to cut a new seat in-line
• The Hy-Drop® valve has positive resetting capability to accommodate multiple operation programs with accurate flow control variations
• Yarway reseating tool can be used to cut a new seat without removing the valve from the piping

• Catalog https://assets.unilogcorp.com/267/ITEM/DOC/Yarway_5817_1_Catalog.pdf