The Mite series of pneumatic relays are engineered to switch, lock or vent various ports based on either an increasing or decreasing pneumatic signal. Their passive design, as well as precise, unerring and immediate decision making abilities make them the ideal solution to critical safety and emergency process controls found in the petroleum, chemical, gas-field or pharmaceutical industries. Their rugged, simple construction provides uncompromising reliability and long term performance with either air or gas service.

Mite系列 71L/71H 高通或低通气动选定继动器

Mite 70

Description

Set to trip on either an increasing or decreasing control signal, the Mite 70 will vent one port to atmosphere while it locks up the pressure in a second line. The tripped position is then held indefinitely until the control signal is restored and a manual reset button is pushed. The trip point is adjustable from 1 to 100 psi with a simple screw stem. The Mite 70 can also be tripped on demand from a separate remote signal. Use the Mite 70 to open safety valves in emergency situations, trigger an alarm while locking up a valve or actuate diaphragm motor valves, air cylinders or other pneumatic actuators.

Mite 73

Description

The Mite 73 is similar in design and function to the Mite 70. A sensitive line monitoring diaphragm and up to four inputs allow even more versatility. When tripped by either an increasing or decreasing signal, one output is vented to atmosphere while the other is locked up. The Mite 73 can be tripped by remote and is also capable of being reset pneumatically for fully automated control.

Mite 85

Description

The Mite 85 allows you to establish two adjustable trip points between 3 and 15 psig. Span capabilities are 6 psig maximum (e.g. 3-9 psig, 9-15 psig) and 1.5 psig minimum (e.g. 3-4.5 psig). These trip points control flow through a 3-way valve. While the signal pressure at port ‘A’ is below the high trip set point, the supply pressure (3 psig minimum, 50 psig maximum) at port ‘I’ is blocked and port ‘H’ is open to port ‘G’. Upon reaching the high trip set point, supply at port ‘I’ will then be open to port ‘H’. This state will remain until the signal pressure at port ‘A’ decreases to below the low trip set point. Port ‘I’ will then close and pressure at port ‘H’ will vent to port ‘G’. The switching action between the two states is crisp, quick and repeatable without having to manually reset. The Mite 85 can be used to directly control valves or be coupled with other Mite decision valves for pneumatic logic systems.

Mite 71H/71L High/Low Pressure Selector

Description

The Mite 71 will automatically select the higher or lower of two pneumatic inputs and pass it downstream while blocking the other. Capable of almost instantaneous selection, the Mite 71 can separate pressure differentials as low as a tenth of a psi. Although ordered as either high or low pass, the Mite 71 can easily be converted in the field from one to the other. The Mite 71 can be relied on to open or close valves when a signal pressure drops or rises past a determined value. They can also be used to prevent a valve from opening or closing beyond a critical point.

Mite 74

Description

The Mite 74 combines the Mite 70 control relay with a precision 2-way or 3-way valve in a single compact package. Either an increasing, decreasing or remote signal can be used to channel air as needed. The Mite 74 can also be used in combination with either of the Mite 71’s so that it will trip when either of two signals drops or rises beyond a set pressure. Once tripped, the Mite 74 will hold its settings until the proper control signal is reestablished and the reset button is pushed.