The Mark 70 series combines multiple spring actuators, and the sliding gate designs for a pneumatically operated diaphragm control valve. The springs are completely enclosed minimizing the dead band and making the valve field reversible without special tools or extra parts.
By utilising a sliding gate seat design, it allows for a quieter operation as well as a longer lasting gate seat as there is less turbulence inside the valve as it provides a straight through flow. It also means the gate has a shorter stroke allowing for faster responses.
The body of the Mark 70 can be manufactured from cast iron, ductile iron, bronze (DN15-50), carbon steel and stainless steel. 316 stainless steel is used for the trim when the body is made from stainless steel and 303 SS is used for all other body materials.
The diaphragm is Buna-N which can operate in temperature up to 93°C. It has Cv rating up to 30 and pipe sizes of between ¼" and 2". Leakage protection is maximised with the stem packing being four times greater than the stem travel.
|Sizes|| (note: 1/4" & 3/8" sizes use 1/2" body with reducers)
|Seat materials||Jorcote on SST – standard|
|Yoke materials||Cast Iron|
|Diaphragm||Buna-N (standard to 200°F/93°C)|
|Stem packing||spring-loaded Teflon (to 450°F/232°C); Graphite (to 1200°F/649°C)|
|Service||steam, water, gas, oil, air and chemicals|
|Shutoff||ANSI Class IV|
Full specifications and further information can be found by downloading the spec sheet here.
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