Specification

Taco Inc., 1160 Cranston Street, Cranston, RI 02920 / [phone] / Fax [phone]
Taco (Canada) Ltd., 8450 Lawson Road, Unit #3, Milton, Ontario L9T 0J8 / [phone] / Fax [phone]
www.TacoComfort.com
Submittal Data # 101-070 Eective: 06/07/17
Supersedes: 09/14/12
Submittal Data Information
Cartridge Style Pressure Reducing Valve
Purpose
The 3350 valve is used to auto-
matically feed water to a hydronic
system whenever pressure in the
system drops below the pressure
setting of the valve.
Operation
The cartridge style design ensures
unsurpassed output pressure stabil-
ity. A balance between diaphragm
position and spring tension based
on the desired outlet pressure is
consistently maintained, even when
inlet pressures uctuate severely.
The unique one-piece cartridge
design signicantly reduces dia-
phragm load, extending the overall
product life. Unlike conventional
PRV designs, the diaphragm does
not double as a seal between the
body and the cap.
This allows for optimization of the
diaphragm for its intended use -
maintaining pressure stability.
A unique encapsulated shaft seal
system prevents owing media from
contacting the diaphragm, greatly
extending diaphragm life. If the
diaphragm ever does fail, the encap-
sulated shaft and body seals work
together to stop water from exiting
the valve. Use of a stainless steel
coaxial strainer prohibits system
debris from aecting the valves’
performance. An integral check
valve allows the cartridge to be
removed under system pressure for
replacement or servicing.
Fast Fill
The 3350 provides an ecient and
simple solution to lling your heat-
ing system. Simply push down the
fast ll button on top of the PRV and
when the set pressure is reached the
valve pops out of fast ll and returns
to its normal operating mode. This
automatic reset feature of the fast ll
on the 3350 eliminates the common
problem of system over pressuriza-
tion and prevents the relief valve
from blowing o.
4-15/32”
(113mm)
1-1/2”
(38mm)
3-9/16”
(90mm)
4-1/4” Sweat Version (108mm)
(Includes Tailpiece)
Dimensions
for reference
purposes only.
1/2” — 14 NPT 1/2” — 14 NPT
1/4 — 14 UNS-2A
Features
Automatic Pressure
Reset from Fast Fill
Easy External Dial-up
Pressure Setting
Set Pressure Indicator
Simple serviceability with the
unique one piece cartridge
Internal check allows the
cartridge to be replaced
without draining the system
Integral Strainer
ASSE 1003
Product Specifications
Max. Inlet Pressure .........250 psi
Adjustment Range ........10 – 50 psi
Max. Temp...........................210˚F
Factory Setting ................12 psi
Media ..................................... Water
Materials of Construction
Body .................... Forged Brass
Cartridge ........... Wetted Parts
................................ Stainless Steel,
................................ Engineered Plastics,
................................ Bronze, EPDM Seals
Model Number Description
3350
1/2” NPT x 1/2” Union Sweat
3350-H
1/2” NPT x 1/2” Union Press
3350-T
1/2” NPT x 1/2” NPT