MIXING SERVICE (Type MX)
The inner valves in
type MX seat inside the two seat rings. When these valves are used for mixing service, the
forces developed by the two inlet flows oppose each other, creating little, if any,
unbalance. Thus, the actuator can control the flow efficiently, with very little power
lost in overcoming dynamic unbalance.
The type MX valve
is also used for diverting service, generally restricted to the smaller sizes.
In contrast to the
MX control valve, the inner valve in the type DV seats outside the twoseat rings. The flow
enters between the two seats and the pressure tends to move the inner valve away from the
seats, adding to the stability of operation. Therefore, the Type DV is preferred for
diverting service in larger valve sizes and at higher pressure.