Diaphragm Actuators - Serie LPD

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Control ValvesRotary Control Valves

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Control Valves Actuators

The Diaphragm Actuators of the 100 series are manufactured by RMT VM to operate on RMT VM linear control valves with both quick open and control service.

They are characterized by a very rugged design for high reliability and easy maintenance.

The Single Spring design offers a more precise control action, very often the multi-spring actuators are affected by not – uniform compression of all the springs. .

Our diaphragm case is in high quality formed steel, with high strength. The upper and lower cases tighten the diaphragm edge in order to get an air proof sealing.

The spring is made of a high strength silicon – manganese steel. It is phosphate or coated “black japon” against corrosion. It has two flat parallel ends and it is top and bottom guided by two steel disks.

It is possible to choose Diaphragm Actuators with direct (fail open) or reverse action (fail close), with handwheels which can be operated either from top or from side.


Technical Features:

Diaphragm Actuators can fit all the globe control valves 22s and 23 series up to DN 16’’.
There are 9 different models with different thrusts, each actuator type can be equipped with different spring range set on different valve strokes.


ACTUATOR MODEL TRAVEL SPRING RANGE [psi] EFFECTIVE AREA THRUST [N/psi]
LPD 111 13, 20, 25 3 – 15, 6 – 30 15 – 30, 20 – 44 470 cm2 330
LPD 113 20, 25, 40 3 – 15, 6 – 30 15 – 30, 20 – 44 677 cm2 476
LPD 115 25, 40, 50 60 3 – 15, 6 – 30 15 – 30, 20 – 44 1070 cm2 700
LPD118 25, 40, 50, 60, 80 3 – 15, 6 – 30 15 – 30, 20 – 44 1295 cm2 906
LPD 118A 80 3 – 15, 6 – 30 15 – 30, 20 – 44 1295 cm2 906
LPD 119 80 3 – 15, 6 – 30 15 – 30, 20 – 44 1295 cm2 906
LPD 124 40, 50, 60, 80, 100 3 – 15, 6 – 30 15 – 30, 20 – 44 1885 cm2 1320
LPD 125 130 3 – 15, 6 – 30 15 – 30, 20 – 44 1885 cm2 1320
LPD 126 150 3 – 15, 6 – 30 15 – 30, 20 – 44 1885 cm2 1320