Product Data Sheet
June 2020
SD 4104-2E07
PTC Block
Pressure and Temperature Compensating Block for VPI A1
PTC Block
June 2020
2
General Description
Functional Description and Hydraulic Symbol
Technical Specification
Pressure and Temperature Compensating Block for VPI
indication. The PTC-Block can be used with fullest advantage
together with the VPI-C (continuous indicator). The PTC-Block
is especially used where an exact indication of the intermediate
and end position of the valve is desired. Where the volume
ratio is extremely large between pipe and actuator, the PTC-
Block can be used with advantage together with the VPI-E (end
position indicator) valve with A and B lines connected to the
The function of the PTC-Block is :
a. Pressure compensation: to ensure that the VPI indicator is
always measuring in the return line from the actuator where
the failure indication is small, as the possible oil compression
in the return line is fixed (approx. 3 bar). By always measuring
on the return line, irrespective of the actuator being
activated through the A or B line, there will be no variation
in compression from measuring to measuring. (Measuring on
the return line gives a signal indicating the movement of the
actuator).
b. Temperature compensation: to allow an undesired oil flow to
bypass the VPI indicator when the actuator is not activated.
tank in intermediate position. The PTC-Block can only be used
for double-acting actuators with an equally large stroke capacity
(for instance BRC, BHA and KC).
Note!
The PTC-Block is always to be used together with a 4/3-way
control.
Pilot valve side/CETOP-3 connection
Indicator side/VPI connection
Maximum working pressure 135 bar
~
1958 lbf/in
2
Maximum test pressure 205 bar
~
2973 lbf/in
2
Maximum flow rate at 135 bar / 1958 lbf/in
2
(through any
line)
6 l/min
Weight 1.3 kg
~
2.87 lb
Hydraulic media Acid-free hydraulic oil
Viscosity 15-200 cSt
Filtration requirements 25 μm absolute or finer
Temperature range -20° C to 80° C
Connection face CETOP R 35H size 3, DIN 24340/VPI connection
PTC Block
June 2020
3
Materials
Main Dimensions
Housing MS 58 (Brass)
Stop screws MS 58 CuZn39Pb3
Screws AISI 304
Seals NBR
Sign Plate AISI 304
Main Dimens ions :
Applic ation: Hydraulic diagram DMS S ys tem diagram:
A1
J an. 2004 S D 4104-2E 04 2/2
P TC -B loc k
VP I P roduc t P rogramme
P res s ure and Temperature
C ompens ating B loc k for VP I
A
P
B
T
A
P
B
T
A
A
A - A
49
72
PTCDATA2.HGL
50
Product Data Sheet
June 2020
PTC Block
SD 4104-2E07
©2020 Emerson. All rights reserved.
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Damcos logotype are trademarks of Damcos A/S. Damcos is a member of the Emerson family of
companies. All other marks are the property of their respective owners.
The contents of this publication are presented for information purposes only, and while effort has
been made to ensure their accuracy, they are not to be construed as warranties or guarantees,
expressed or implied, regarding the products or services described herein or their use or
applicability. Standard Terms and Conditions of Sale can be issued by contacting Damcos A/S.
We reserve the right to modify or improve the designs and specifications of our products at any
time without notice. Damcos A/S accepts no responsibility for any errors that may appear in this
publication.
Emerson Automation Solutions
Damcos A/S
Aaderupvej 41
DK-4700 Naestved
T +45 5578 7200
F +45 5578 7272
www.Emerson.com/marine
Hydraulic and System Diagram
Hydraulic Diagram:
System Diagram:
