Series 91000
••• Self-Operating Regulators
Operation, Installation & Maintenance Manual
Page 5
INSTALLATION
Deciding the LOCATION for the Regulator
The regulator should be installed in an accessible location on horizontal piping. Possible damage from moving
parts, splashing of corrosive liquids, vibration, heat, fluid pulsations, etc., should be considered in deciding the
location. Similar consideration should also be given to the connecting tubing and bulb. The tubing for the
special purpose “Small Bulb” option (9” long) should be located where the temperature is at least 20°F cooler
than the control point.
REGULATOR Installation
A strainer should be installed just ahead of the regulator to protect the valve from dirt, scale or foreign
matter which could interfere with the seating of the valve. A three valve by-pass installed around the
regulator will facilitate removal for service.
Blow out all pipe lines thoroughly to eliminate all foreign material from the system. Pipe thread compound
should be applied only on external or male pipe threads (not on the union nut threads). Install the regulator
in a vertical position with the flow direction through the valve corresponding to the flow arrow cast on the
valve body. Tighten tailpieces of unions on piping first and then tighten both valve union nuts
simultaneously.
Positioning the Indicator
The Model 91400 Self-Operating Regulator contains an integral dial thermometer that can be rotated 330°
about the vertical axis for best readability. To prevent thermal system damage, a rotation stop is built in.
If the stop prevents a proper viewing angle from being achieved, rotate the thermometer in the opposite
direction. This thermometer can also be tilted up or down for maximum readability. To tilt, loosen the
clevis screw/nut, tilt thermometer to desired angle and re-tighten the clevis screw/nut combination.
NOTE: ACTUAL BYPASS
LINE SHOULD BE LEVEL
WITH OR ABOVE
PROCESS LINE.
