Principles Of Operation - CALEFFI 578 Serie Documentation Technique

PRINCIPLES OF OPERATION

(Illustration type GE)
On/Off Control
Tight Closing Operation
When pressure from the valve inlet (or
an equivalent independent operating
pressure) is applied to the diaphragm
chamber the valve closes drip-tight.
THREE CHECKS
The 100-01 HYTROL Valve has only one moving part (the diaphragm and disc assembly). So, there are only three major
types of problems to be considered.
First: Valve is stuck - that is, the diaphragm assembly is not free to move through a full stroke either from open to close or
vice versa.
Second: Valve is free to move and can't close because of a worn out diaphragm.
Third: Valve leaks even though it is free to move and the diaphragm isn't leaking.
CAUTION! Care should be taken when doing the troubleshooting checks on the 100-01 HYTROL Valve. These checks do
require the valve to open fully. This will either allow a high flow rate through the valve, or the downstream pressure will quickly
increase to the inlet pressure. In some cases, this can be very harmful. Where this is the case, and there are no block valves
in the system to protect the downstream piping, it should be realized that the valve cannot be serviced under pressure.
Steps should be taken to remedy this situation before proceeding any further.
Valve size (DN)
NGE
50
65 & 80
100
125 & 150
200
250
300
350 & 400
500 & 600
On/Off Control
Full Open Operation
When
chamber is relieved to a zone of
lower pressure (usually atmosphere)
the line pressure (5 psi Min.) at the
valve inlet opens the valve.
COVER CHAMBER CAPACITY
(liquid Volume displaced when valve opens)
GE Liters
32 - 40 0,07
50 0,12
65 0,16
80 0,30
100 0,64
150 2,00
200 4,80
250 9,50
300 15,10
350 24,60
400 36,20
Installation - Operation - Maintenance
pressure in diaphragm
Gallons
0,020
0,032
0,043
0,080
0,169
0,531
1,260
2,510
4,000
6,500
9,570
35
Serie 578
NGE - GE - AE
CLA-VAL control
Modulating Action
Valve modulates when diaphragm pressure
is held at an intermediate point between inlet
and discharge pressure. With the use of a
CLA-VAL. "modulating control," which reacts
to line pressure changes, the pressure above
the diaphragm is varied, allowing the valve to
throttle and compensate for the change.
STEM TRAVEL
(Fully Open To Fully closed)
mm Inches
10,0
15,0
18,0
20,0
28,0
43,0
58,0
71,0
86,0
100,0
114,0
0,40
0,60
0,70
0,80
1,10
1,70
2,30
2,80
3,40
4,00
4,50