Cla-Val 100-20 600 Series - Manual (Page 2)

Installation
1. Before valve is installed, pipe lines should be flushed of all
chips, scale and foreign matter.
2. It is recommended that either gate or block valves be
installed on both ends of the 100-20 Hytrol Valve to facilitate
isoIating the valve for preventive maintenance and repairs.
3. Place the valve in the line with flow through the valve in the
direction indicated on the inlet nameplate. (See “Flow Direction”
Section)
4. Allow sufficient room around valve to make adjustments and
for disassembly.
5. CIa-VaI 100-20 Hytrol Valves operate with maximum efficiency
when mounted in horizontal piping with the cover UP, however,
other positions are acceptable. Due to size and weight of the
cover and internal components of 8 inch and larger valves, installation with the cover UP is advisable. This makes internal
parts readily accessible for periodic inspection.
6. Caution must be taken in the installation of this valve to insure
that galvanic and/or electrolytic action does not take place. The
proper use of dielectric fittings and gaskets are required in all
systems using dissimilar metals.
7. If a pilot control system is installed on the 100-20 Hytrol Valve,
use care to prevent damage. If it is necessary to remove fittings
or components, be sure they are kept clean and replaced
exactly as they were.
8. After the valve is installed and the system is first pressurized,
vent air from the cover chamber and pilot system tubing by
loosening fittings at all high points.
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.
Full Open Operation
When pressure in diaphragm chamber
is relieved to a zone of lower pressure
(usually atmosphere) the line pressure
(5 psi Min.) at the valve inlet opens the
valve.
Modulating Action
Valve modulates when diaphragm pres-
sure 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.
Principles of Operation
Three Way
Pilot Control
Three Way
Pilot Control
Restriction
Modulating
Control
Flow Direction
The flow through the 100-20 Hytrol Valve can be in one of two
directions. When flow is “up-and-over the seat,” it is in “normal”
flow and the valve will fail in the open position. When flow is “over-
the seat-and down,” it is in “reverse” flow and the valve will fail in
the closed position. There are no permanent flow arrow markings.
The valve must be installed according to nameplate data.
BRIDGEWALL INDlCATOR
Normal Flow Reverse Flow
(cast into side of valve body)
Recommended Tools
1. Three pressure gauges with ranges suitable to the instal-
lation to be put at Hytrol inlet, outlet and cover connections.
2. Cla-Val Model X101 Valve Position Indicator. This pro-
vides visual indication of valve position without disassembly
of valve.
3. Other items are: suitable hand tools such as screw-
drivers, wrenches, etc. soft jawed (brass or aluminum) vise,
400 grit wet or dry sandpaper and water for cleaning.
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