Instructions / Assembly

Instruction Sheet
Boiler Feed Valves (Pressure Reducing Valves)
Models 329, 329-T, 335, 335U-050-C, 335U-050-T, 335U-075-C, 335U-075-T
Dual Controls
Models 334 and 334-T
102-006
SUPERSEDES: November 1, 2012 EFFECTIVE: November 6, 2017
Plant I.D. 001-924
RATINGS:
Boiler Feed Valves (Reducing Valves):
Maximum Fluid Temperature 212°F (100°C)
Maximum Supply Side Pressure 100 psi (689 kpa)
Setting Range 10-25 psi (69-172 kpa)
Factory Setting of System Side 12 psi (83 kpa)
Dual Controls:
Maximum Fluid Temperature 212°F (100°C)
Maximum Supply Side Pressure 100 psi (689 kpa)
Relief Valve Set to Release at 30 psi (207 kpa)
DESCRIPTION:
The Boiler Feed Valves are adjustable pressure reducing
valves that automatically maintain system pressure. They are
equipped with a FAST FILL lever that can be used to override
automatic pressure regulation during purging.
329 and 335U-050-C:
1
⁄
2
" union connection with a
sweat tailpiece at inlet end and
a female NPT connection at the
outlet end.
329-T and 335U-050-T: same as 329 except the inlet
union connection is threaded.
335:
3
⁄
4
" cast brass body with female
NPT connections at body ends.
335U-075-C:
3
⁄
4
" sweat union,
3
⁄
4
" FNPT outlet
335U-075-T:
3
⁄
4
" NPT union,
3
⁄
4
" FNPT outlet
The Dual Control consists of a 329 Boiler Feed Valve with an
in-line pressure relief valve connected at its outlet end.
334:
1
⁄
2
" union connection at inlet with a sweat
tailpiece and a female NPT connection at
the outlet end.
334-T: same as the 334 except the union end tail-
piece is threaded.
INSTALLATION:
1. Install the Boiler Feed Valve or the Dual Control in a hori-
zontal position in the cold water supply pipe to the boiler.
2. Install a shut-off valve on the upstream side of the Boiler
Feed Valve. This valve, provided for isolation purposes
during maintenance, must be open at all times during oper-
ation so that the Boiler Feed Valve can maintain pressure
automatically.
3. Flush out the supply pipe to clear it of chips, scale, dirt, etc.
before connecting it to the inlet of the Boiler Feed Valve.
4. Connect a pipe from the bottom “DRAIN” connection of the
Relief Valve in the Dual Control. Direct it to some conve-
nient open drain, such as a floor drain or set tubs. Always
obey local regulations. DO NOT install a valve of any kind
in the drain pipe. The pipe must always pitch down from
the valve, with no part of it above the valve, and be no
smaller in size than the valve drain connection size.
SYSTEM
RETURN
HOT WATER
BOILER
TO
SYSTEM
TO
DRAIN
SHUT-OFF
VALVE
COLD WATER
SUPPLY
BOILER FEED
VALVE OR
DUAL CONTROL
Caution: Boiler Feed Valves and Dual Controls should only be installed by qualified heating professionals.
Consult local authorities for any code requirements in your area.
Models 329 & 334 are cast iron. Models 335 & 335U are brass.