ARI Armaturen DP34 Tridem EN - Manual (Page 3)

0040504001 2010 Page 3
Operating and installation instructions
Pneumatic actuators - DP34T / DP34Tri
3.0 Storage and transport
- At -20°C to +65°C.
- Do not damage paint protection. (The actuators should rest in the packing till installation.)
4.0 Description
4.1 Scope of applications
The pneumatic actuators are to be mounted on the top of valves and are necessary to
operate the valves (stem movement) under service conditions.
The units are suitable for being employed in control systems used in the chemical industry.
Please contact the supplier or the manufacturer if you have any questions.
4.2 Operating principles
By means of the pneumatic actuator units, pneumatic control signals are converted into a
translatory motion. The necessary restoring force is generated by means of the
compression springs on the bulk of the diaphragm plate.
In case of air fall-off, the actuator will be restored by means of the spring force in the
starting position.
By using a rolling diaphragm, linear rod forces during long lifts can be obtained.
The operating mode of the actuator is the following:
„actuator stem extends by spring force“(on air failure) or
„actuator stem retracts by spring force“(on air failure)
This operation is obtained and dependent on the assembly of the springs.
The pneumatic actuators with manual emergency adjustment can be operated without
operating pressure by turning the handwheel.
The transmission of power is made by a wormgear screw jack which transmit the rotation
into thrust.
ATTENTION !
- Protect against external force (like impact, vibration, etc.).
- Valve mountings such as actuators, handwheels, hoods must not be used to
take external forces, e.g. they are not designed for use as climbing aids, or as
connecting points for lifting gear.
- Suitable materials handling and lifting equipment
should be used.
Observe max. load-carrying capacity of the eye
nuts: DP34T / DP34Tri = 170kg
(Refer to catalog sheet for weights)
ATTENTION !
- Refer to the data sheet for applications, limits on use and possibilities.
ATTENTION !
- After engaging, the manual emergency adjustment has to be set in starting
position to avoid the deadlock with usual operating.