© 2017 Honeywell International Inc
Operation and maintenance manual HON HSV086 17
4.3 Setting the higher threshold value
a) The lower threshold value has already been set.
b) If not, turn maximum spring seat G all the way up (maximum spring is completely
compressed, don’t block).
c) Set the pressure in pressure converter D between the lower and higher threshold
value, at approx. half the value of the higher threshold value.
d) Screw in set screw S until the balance handle H is horizontal. The balance handle
should not have any play now at the points of support N and Q and at the balance
jaw P. Fix the set screw with lock nut T.
e) Lift the valve shaft L with handle arm R and lock switch pin M with balance jaw P.
The following steps for an HON HSVS
f) Lift the valve by pushing in hand wheel H3 and turning it anti-clockwise (this may
already have been done when setting the lower threshold value).
g) If necessary, fit accessory A9 in SVC086 to prevent complete disconnection.
h) Set the higher threshold value of the pressure converter.
i) Turn maximum spring seat G down until SVC086 disconnects.
j) Place balance handle H horizontally again by adjusting the pressure in the
pressure converter as described in point c).
k) Repeat steps e) to j), resp. steps e), h), i), and j) when accessory A9 is used, a
number of times and adjust maximum spring seat G if necessary.
Check that the SVC086 disconnects at the right higher threshold value.
Remark
When the lower threshold value is altered, the higher threshold value also has to be
reset (because of the lever action in the SVC086).
4.4 Operational test
At the works, the device was equipped with the correct springs for the threshold value
as specified in the order. In principle, a normal operational test should therefore
suffice.
However, when this test shows that the set pressure is not set correctly, you’ll have to
alter it. Consult chapters 4.4 and 4.5 for this.
As a safety valve is seldom activated in normal operation, it is advisable to carry out
an operational test regularly. Don’t forget to test the emergency button, either. This
operational test should be carried out with a complete system. Because of the forces
exercised and carried over at the current pressure, it is advisable and useful for the
system to be pressurised during the operational test.
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