Badger Meter Research Control Valve - Manual (Page 3)

General
The purpose of these instructions is to supply pertinent
information for installation of original equipment, repair,
adjustments, retrimming, repacking and other informa-
tion necessary to achieve the best possible service
from Research Control Valves.
Research Control Valves are engineered, designed, and
manufactured with the end user in mind. Most parts are
interchangeable with any other like assembly. The inner
components (spare trims) are available in 39 different
flow coefficient (Cv) sizes and in many different mate-
rials compatible with most process conditions.
Installation
After inspecting the valve (or valves) and determining
that the valve (or valves) meets the specifications, in-
stall as follows:
1. Normal installation is directly into any 1/4", 1/2",
3/4", or 1” piping system with flow direction arrow on
body pointing downstream. This allows the stem pack-
ing to
see the lowest pressure conditions after the
pressure drop occurs. It should be noted that chevron
ring stem packing is a dynamic seal that needs pres-
sure to be energized.
2. Valves, especially plastic, should be bracket mounted
in high vibration areas or where they may be subjected
to damage from shock. If necessary, provide as required,
bypass, manual block valve, filters, etc. When install-
ing valves that have the Low Flow “P” Series innervalves,
small micron filters should be used where process per-
mits.
3. Connect instrument air supply to diaphragm case
using appropriate NPT fittings (1/8" NPT for 1/4" valves
and 1/4" NPT for 1/2", 3/4", and 1” valves) to the de-
sired tubing size adaptor (normally 1/4” tube fittings).
All connections to standard positioners, Moore prod-
ucts or Badger
® , are 1/4" NPT. (For positioner data, see
paragraph under Positioners.)
4. All standard production valves as shipped are ad-
justed and preset at the factory with 90 PSIG air piped
to the inlet port of the body. Air-to-open valves are ad-
justed to come off seat at approximately 3.25 PSIG
instrument signal and be fully opened at 15 PSIG. Air-
to-close valves are set to close when signal is at 14.75
PSIG and be fully open at 3 PSIG. Process conditions
may dictate additional adjustment of the spring adjuster
FIG. 1
to hold unbalance created by higher pressure on actual
application. It should be noted that on air-to-close valves
with no pressure, the travel indicator will show over travel.
With 3 PSIG to actuator, the indicator will be very close
to the open position.
Disassembly and Reassembly
(Best done at instrument shop bench)
For the purpose of these instructions, consider the
topworks or actuator as a complete sub-assembly not
to be dismantled except for replacing diaphragms or
topworks packing. The only necessary topworks ad-
justment is made with the spring adjuster and/or the
zero adjustment on positioner-equipped valves (see
paragraph on Positioners). To position the stem, travel
in relation to the 3-15, 3-9, 9-15 PSIG etc. instrument
signal operating the valve.
Replacing Trim Sets
Installing innervalve trim sets is accomplished with the
body and bonnet subassembly separated from the
topworks using appropriate wrenches. (Tool kits are
available at a nominal cost for 1/4”, 1/2”, 3/4”, and 1”
valves.) To separate the body bonnet assembly from
the topworks on ATO valves, apply 6-9 PSIG instru-
ment air to the operator, lifting innervalve off seat to
prevent damage to the valve seating surfaces. (Not
necessary for ATC valves.)
1