Download MTD 242687 Specifications

SECTION
3-1.
III.
REVERSE
OPERATIONAL
DESCRIPTION.
In reverse
acting positioners, the piston and piston rod operate.
the same as when set up for direct acting (Figure
l-2). The cam is reversed front to back and the
cylinder air hoses are exchanged. These alterations
cause supply air to be directed to the top of piston
when signal air pressure is increased and to the
bottom of piston when signal air pressure is
decreased. In this case, piston movement is inversely
OPERATION
related to the signal. A falling signal air pressure
raises the piston and an increasing signal air pressure
lowers the piston.
3-2.
PROCEDURES
FOR REVERSING
OPERATION.
To reverse the operation of the
cylinder, refer to Figure 3-1 and use the following
procedures.
I
ITEM
1
2
3
4
5
6
I
8
9
10
11
12
13
14
15
Figure 3-1. Reverse Operation
DESCRIPTION
Linkage Lever
Cl&s
Stroke Adjustment
Lock Screw
Pivot Screw
CL%”
Cam Mounting Bracket
Spring Nut
Set screw
Upper Cylinder Hose
Upper Cylinder Head
Lower Cylinder Hose
Lower Cylinder Head
Gland Cap
Clevis Head
Piston Rod