![mk78.jpg](https://d1twohzh90cvik.cloudfront.net/assets/files/1977/mk78.768x768.jpg)
Designed with the purpose of being easily maintained whilst providing accurate performance, the Mark 78 pneumatic control valve features a cage retained seat design that has a top entry to allow for maintenance without having to be removed from the line. Seats are not screwed in and so can be simply lifted out of the valve body.
A controlling range of between 3-15psi (0.2-1.0bar). There is an option for split ranges, however this requires a positioner. Optional soft seats that are ANSI Class VI Teflon can be used otherwise the seat is standard ANSI Class IV.
A variety of materials allow for the valve to be very versatile and used in a range of applications from utility steam to corrosive liquids. The body can be manufactured from Bronze, Carbon Steel or Stainless steel with a range of flanged connections or threaded.
The valve has a capacity of 50 Cv or 43Kv and has a maximum temperature range of between –40°C and 232°C.
Characterised flow options are linear, equal percentage, quick-opening or an equal-linear combination with rangeability being 60:1 for equal percentage and equal-linear or 30:1 for linear. Sizes start from ½" and go up to 2" (DN15 to DN50).
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