Cla-Val 90-99 - Manual

High Pressure
Gauge
Isolation Valve
Reduced
Pressure
CLA-VAL 90-99
Pressure Reducing Valve
Pressure Reducing Valve with
Low Flow By-Pass
Typical Applications
This valve has the flexibility to be installed in a distribution sys-
tem where the demand varies over a wide range. This frequent-
ly occurs in industrial, residential, educational, high-rise build-
ings and other applications. Another important feature of the
valve is its space efficient configuration, allowing easy installa-
tion and maintenance.
Schematic Diagram
Item Description
1 90-01 Pressure Reducing Valve
1-1 Hytrol (Main Valve)
1-2 X58C Restriction Tube Assembly
1-3 CRD Pressure Reducing Control
2 90-01 Pressure Reducing Valve (Bypass)
2-1 100-01 Hytrol, Grooved End (Main Valve)
2-2 X58C Restriction Tube Assembly
2-3 CRD Pressure Reducing Control
3 CGA Angle Valve
Optional Features
Item Description
A X46A Flow Clean Strainer
B CK2 (Isolation Valve)
C CV Flow Control (Closing)*
D Check Valves with Isolation Valve
P X141 Pressure Gauge
S CV Flow Control (Opening)*
V X101 Valve Position Indicator
Y X43 "Y" Strainer
* The optional closing speed control on this valve should
always be open at least three (3) turns off its seat.
• Modulating Control
• Maintains Constant Outlet Pressure Over a
Wide Range of Flows
• Durable Construction
• Convenient, Compact, Space Saving Design
The Cla-Val Model 90-99 Pressure Reducing Valve with Low Flow
By-Pass automatically reduces a higher inlet pressure to a steady
lower downstream pressure, regardless of changing flow rate. The
low flow by-pass capability is achieved by using a 2” grooved end
90-01 Pressure Reducing Valve as an integral part of the main
valve. This compact design saves space and makes for an easier
installation process.
The pressure reducing valve is hydraulically operated and con-
trolled by a Cla-Val CRD pilot control, which senses pressure at the
main valve outlet. An increase in outlet pressure forces the CRD
pilot control to close and a decrease in outlet pressure opens the
control. This causes the main valve cover pressure to vary, modu-
lating the main valve, thereby maintaining constant outlet pressure.
The pressure reducing low flow by-pass valve is also controlled by
a Cla-Val CRD pilot control, which is preset to a higher pressure
than the CRD pilot control on the main valve. The pressure reduc-
ing low flow by-pass valve responds to pressure at the main valve
outlet. When the CRD on the main valve closes, the CRD on the
pressure reducing low flow by-pass remains open, allowing flow to
by-pass the main valve. The bypass valve closes when the flow
decreases and the downstream pressure reaches the set-point of
its CRD pilot control.
90-99
MODEL
(Full Internal Port)
We recommend providing adequate space around valve for maintenance work