Travel And Torque Limits; General Information - Emerson 2000LP Series Installation, Operation And Maintenance Manual

Installation, Operation and Maintenance Manual
Part Number: E7K-400-0413
Section 8: Travel and Torque Limits
8.1

General Information

All Series 2000LP pneumatic actuators are provided with 3-way pneumatic travel limit valves
(LVO and LVC). They are activated at each end of stroke to neutralize the control and stop the
actuator in the proper position.
See figure 4 for location in control housing.
Series 2000LP actuators are also provided with 3-way pneumatic torque limit valves (TVO and
TVC). They are activated when an over-torque condition is detected in either the opening or
closing direction and will neutralize the control in order to prevent valve damage. They may
also be set to provide the correct amount of torque for torque seated valves.
See figure 4 for location in control housing.
Figure 4
NOTE:
All position and torque limit valves must be set according to the instructions on the following
pages of this manual after mounting the actuator to the valve.
The control assembly can also be fitted with auxiliary pneumatic limit valves for remote
indication or other logic circuits as desired. These valves are mounted on top of the travel limit
valves (LVO - LVC) and are actuated by the same cams as the travel limit valves. Consequently
they cannot be adjusted to operate at any valve position other than full open and full closed
with the travel limits. These valves can be used as 3-way normally closed, 3- way normally open
or selector valves depending on port selection.

Travel and Torque Limits

LVC LVO TSO
TSC TVC
TVO
Section 8: Travel and Torque Limits
April 2013
13