Cla-Val 100-34 - Manual

Description
The CIa-VaI Model 100-34 Hytrol Valve is a main valve for
CIa-VaI Automatic Control Valves. It is a hydraulically operated,
diaphragm-actuated, globe or angle pattern valve.
This valve consists of three major components; body, diaphragm
assembly, and cover. The diaphragm assembly is the only moving
part. The diaphragm assembly uses a diaphragm of nylon fabric
bonded with synthetic rubber. A synthetic rubber disc, contained
on three and one half sides by a disc retainer and disc guide,
forms a seal with the valve seat when pressure is applied above
the diaphragm. The diaphragm assembly forms a sealed chamber
in the upper portion of the valve, separating operating pressure
from line pressure.
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 100-34 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 100-34 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. If a pilot control system is installed on the 100-34 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.
7. 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
100-34
Hytrol Valve
MODEL
INSTALLATION / OPERATION / MAINTENANCE