Temperature

The operation of the MK80 is fairly simple. A pre-measured amount of liquid fill is drawn into the thermal system filling the upper diaphragm chamber, the capillary tube, and most of the bulb. As the controlled temperature increases, the volatile liquid fill in the sensing bulb begins to vaporize and creates pressure on the sealed system. This pressure drives the valve stem, closing direct acting valves, or opening reverse acting valves.
Because of the shorter stroke length of the sliding gate seats, the MK80 is able to utilize a sealed actuator with a stainless steel diaphragm, and does not require a bellows to operate. To seal the actuator, the upper and lower casings and diaphragm are heli-arc welded around the circumference to create a solid bond. This seal eliminates the need for any type of gasket. All sealing surfaces on the MK80 are metal to metal.

The Mark 86 ambitemp regulator is designed to control steam tracing lines based on ambient temperatures. The MK86 allows steam to flow through the tracer lines only when it is needed, and remains closed when the ambient temperature rises above the predetermined set-point.

The Mark 87 piloted temperature regulator is the Sliding Gate valve engineered to provide wide range-ability, and greater accuracy, for a variety of temperature control applications. Designed with the same technology as the Mark 80, the Mark 87 is a piloted temperature regulator that offers quality and performance.

BROCHURE

The Mark 89 is used for diverting service and is ideal for bypassing fluids around coolers or filters. In this configuration, there is one inlet and two outlets. As one outlet closes, the other outlet opens, diverting flow from one channel to the other. The Mark MK89MX is ideal for mixing service.