BERMAD 400E-Y, Инструкция по установке, эксплуатации и обслуживанию

Страница: 54 / 71

appliceng@bermad.com
●
www.bermad.com
The information contained in this document is subject to change without notice. BERMAD shall not be liable for any errors contained herein.
All Rights Reserved. © Copyright by BERMAD Control Valves.
22
.
02
.
12
IOM
Model: 42T
PAGE 5 OF 1
7.2
Fully open upstream indicating valve
7.3
Gradually open downstream indicating valve to fully open, allowing flow through the Bermad 42T Pressure-
Reducing Valve.
7.4
Wait for downstream pressure stability.
7.5
Slowly close the flow-consumer that was opened in step #1 above to fully close.
7.6
There is no flow; the pressure on the downstream side of the system that is reflected through the pressure gauge.
Should be according to the factory pre-set adjusted pressure plus up to an additional 10%.
Readjusting
The pilot valve is factory pre-set according to the stated demands of the customer.
The pre-set is clearly indicated on the pilot valve tag. If readjustment to either the pressure or valve response is required,
follow the following steps.
7.7
When readjusting the outlet pressure, the inlet pressure should be at least 15 psi (1 bar) higher than
the set outlet pressure.
7.8
Ensure that there is minimum flow through the main valve (see Table 1, for minimum flow rate for pilot
valve setting).
7.9
Free the tension between the adjusting screw on the pressure reducing pilot valve (4 in figure 2) and
the fastening nut by turning the fastening nut counterclockwise.
7.10
By alternately turning the adjusting screw on the pilot valve a half turn and then reading the
downstream pressure, gradually adjust the pressure:
Counterclockwise to decrease (-) the downstream pressure,
Or Clockwise to increase (+) the downstream pressure.
7.11
Repeat the Starting-up procedure, steps 6.1-6.5.
Caution
: If needle valve is furnished (optional), changes in the adjustment of the needle valve have
great impact on the valve performance. The needle valve is factory set at one-half turn open to one and
one-half turn open. The maximum number of turns is 3 from fully closed to fully open. More than 3 turns
toward open might cause the valve to perform at less than optimal functioning. Perform step 6.5 with
this in mind.
Figure 2: Operation Drawing