Brochure

Dimensions — Inches (mm)
Model
Part
Number
Number
Approx.
Shpg. Wt.
lbs. (Kg)
HT-3/4
HT-1
HT - 1-1/4
107035
107037
107038
1.3 lbs. (0.6)
1.2 lbs. (0.5)
1.8 lbs. (0.8)
1-11/16" (43)
1-11/16" (43)
1-7/8" (48)
Do not use for construction. Dimensions are approximate and subject to change. Contact factory for certified dimensions.
A
B
C
D
E
F
3/4" NPTF
1" NPTF
1-1/4" NPTF
3-3/16" (82)
3-5/8" (93)
4" (101)
3" (76)
3-3/16" (82)
3-11/16" (93)
1-9/16" (40)
1-9/16" (40)
1-11/16" (43)
1-3/4" (44)
1-15/16" (50)
2-1/4" (57)
31
VALVES Hydrotrol
™
Flow Control Valves
Operating Data
Maximum Working Pressure: 150 PSI (10 bar)
Maximum Operating Temperature: 250°F (121°C)
Materials of Construction
Body: Brass
Internal Components: Non-Ferrous
Specifications
Description
The Hydrotrol (HT) flow control valve is used to prevent overheating of zones
due to gravity flow in hydronic heating systems and will permit summer-winter
operation of indirect water heater. The HT valve allows fluid to pass when the
system or zone pumps start. When the system or zone pumps are not operating,
the HT valve remains closed, preventing gravity circulation. The HT valves are
designed with a 1/2 turn knob that can be manually opened when draining
the system or for bypass purposes. The HT valve can be installed in either the
horizontal or vertical orientation.
VALVES DB–Differential Bypass Valve
Specifications
D
A
B
A
C
Description
The differential bypass valve is used in systems where heating
loads may be excluded from the circuit as zone valves close.
It controls the excess flow in the system by acting as a bypass
while ensuring adequate flow to the remaining open circuits.
The differential bypass valve helps reduce velocity noise
caused by excess flow through the circuits while maintaining
the pump head at a constant value.
Operating Data
Maximum Working Pressure: 150 PSIG (1,034 kPa)
Maximum Operating Temperature: 230°F (110 °C)
Adjustment Range: 2 to 10 PSI
Materials of Construction
Valve Body: Brass
Seals: EPDM
Spring: Stainless Steel
Knob: ABS
For hydronic systems utilizing zone valve
• Controls excess flow in the system when there
is reduction in demand
• Available in 3/4” connection
• All brass body with non-ferrous internals
Model
Number
Part
Number
A
(mm)
B
(mm)
C
(mm)
D
(mm)
Connection
Type
Weight (LB)
DB-3/4 113247 3/4”
(19)
2-5/16”
(59)
1”
(26)
4”
(104)
M
NPT
1