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The downstream pressure is sensed beneath the diaphragm. As the downstream pressure exceeds the setpoint, pressure is exerted on the diaphragm which raises the stem to modulate the disc (the moveable component on the sliding gate seat set) toward the closed position. As the seats close, downstream pressure will be reduced to the required setpoint. A decrease in pressure relaxes the spring and diaphragm to move the seats toward the open position.

The Mark 60 offers many features: Fast Response - the short stroke means fast response to changes in process conditions, resulting in less offset in pressure.

Straight-through Flow - The flow is straight through the valve seats and body. Direction of the disc travel is at right angles with the flow, not opposed to the direction of the flow. Thus, the flow does not unblance the seats. The MK60 can use a wider range of its stroke to give accurate control; thereby giving a turndown ration of approximately 15:1.

Quiet Operation - The design of the Sliding Gate seats makes it inherently quieter than other types of regulators. The disc and plate are always in contact, which eliminates chattering. Straight-through flow minimizes turbulence. Multiple orifices in the plate and disc divide the flow stream into smaller flow components, also reducing noise.

Minimum Maintenance - The MK60 sliding gate seats require no special tools for disassembly. The seats are pre-lapped at the factory and are self-lapping while in operation ensuring a continual tight shutoff. In sizes 2" (DN50) and below, there are no orings or gaskets to wear out - 100% metal-to-metal sealing - for longer service life.