8
3
/
5. Install the secondary pressure sensing line with a slightly falling pitch.
The 10 mm ( ") pipe should be connected to a point where the pressure is to be sensed.
The connection must be at a point on the main piping where there is a straight section of
upstream main piping of a length of 15 d (d = pipe diameter), or 1 m (3'4"), whichever is
greater, and a straight section of downstream main piping of a length of at least 15 d.
1. Loosen and remove the four (4) bolts that attach the pilot body to the main body (15 - 50
mm, "- 2") or the pilot cover (65 - 150 mm, 2 " - 6"), and remove the pilot valve body.
2. Install the connecting tube by first removing the blind pin from the secondary side of the
main body or pilot cover and then substituting the connecting tube.
3. Re-install the pilot body and fasten the four (4) bolts evenly.
Consult page 21 in this manual for torque requirements of these bolts.
4. If a secondary pressure sensing pipe has previously been installed, remove it and be certain
to install the threaded secondary pressure sensing line plug in its place.
A shutoff valve and pipe union should be installed in the secondary pressure sensing line, to be
used when the valve is taken out of service (see beginning of section 4.16).
4.17 Internal Sensing for North American Models
All models except North American models are factory prepared for internal sensing. When
internal pressure sensing is required for North American models, please contact the nearest
representative to request both a connecting tube, which must be installed in place of the
blind pin, and a threaded secondary pressure sensing plug.* Follow the connecting tube
installation procedure shown below:
* Internal sensing should not be used when 15 mm ( ") and 20 mm ( ") COS-16/COSR-16
will be used below 0.3 MPaG (3 barg, 45 psig) and 0.1 MPaG (1 barg, 15 psig) respectively,
and below 50% of primary pressure.
Union
Valve
Connecting tubeBlind pin
15 d or 1 m (3'4"),
whichever is larger
At least 15 d
d = pipe diameter
Steam-using
Equipment
3. Re-install the pilot body and fasten the four (4) bolts (A) evenly to the fastening torque
shown on page 21.
4. Next, loosen and remove the threaded secondary pressure sensing line plug (D) to install the
external pressure sensing line.
2
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4
3
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2
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English
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