Short Pattern Fractional Flow Control Valve
The Mark 708SH was developed to provide the most accurate control available for fractional flow services; whether for pilot plant installations, test stands, R & D facilities or for specialized processes such as dosing, injection and venting applications. The Short Pattern, 1/4" offers Cv's ranging from 0.00001 through 0.2 (0,000009 to 0,17 Kv in DN8). A small package ideal for critical fractional flow applications where space is at a premium.
The rolling diaphragm design ensures that the effective diaphragm area remains relatively constant, regardless of valve stem position. This increases accuracy of the actuator when positioning the valve by ensuring a linear response to input signal changes.
The spring-loaded packing maintains a proper compression, while minimizing excessive friction. This alleviates the need for most field adjusting. The TFE packing is suitable for temperatures to 450°F (232°C), while braided or Graphite/Grafoil may be used for higher temperature requirements
The bolting provides solid construction and secure connection. This bolting adds ease to maintenance, as bonnet/actuator assembly may be removed from the valve body in-line.
Size: 1/4″ (DN8)
End Connections: Threaded (NPT, BSPT, BSPP), Socket Weld, others
Diaphragm Material: 7M & 14M – rolling (Nylon/Nitrile)
Body/Bonnet Materials: Carbon Steel, Stainless Steel, Hastelloy B & C, Alloy 20, Monel, Titanium
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