Fisher 3570 - Page 27

Instruction Manual
D200137X012
3570 Positioners
September 2015
27
Figure 10. Fisher 3570 Positioner
40A8973‐C
B1840
1
1
NOTE:
1 ZERO ADJUSTMENTS IS PART OF KEY 9 FOR EXTENSION TYPE BIAS SPRING.
EXTENSION TYPE
BIAS SPRING
ASSEMBLY
SECTION OF PART 29
PART 22
DIRECT
ACTION
1/4 NPT
CYLINDER
BOTTOM
CONNECTION
1/4 NPT
SUPPLY CONNECTION
1/4 NPT
INPUT SIGNAL
CONNECTION
3/8 NPT VENT
CONNECTION
Key Description
26 Valve Assembly
For 3570C only
27 Hex nut, brass
For 3570, 3571, 3573 (2 req'd)
For 3572, 3576, 3577 (1 req'd)
For 3570C (none req'd)
28 Instrument tubing assembly, copper
For all types except 3570C
29 Relay assembly, included in Repair Kits
Key Description
30 Relay gasket, (2 req'd)
Chloroprene (std. const.)
Fluorocarbon (hi‐temp. const.)
31 Machine screw, pl steel
For 3570, 3570C, 3571 (6 req'd)
For 3572, 3573, 3576, 3577 (3 req'd)
32 Cap screw, pl steel (2 req'd)
33* O‐ring
Nitrile (std. const.)
Fluorocarbon (hi‐temp. const.)
*Recommended spare parts