Ross Controls PRECONFIGURED LEAK TEST MANIFOLDS SERIES LT User Manual
Series LT Leak Test Valves & Manifolds
3/4 Manifolds
Manifold valve 3-port 4-position, normally closed.
Operator: External pilot, multi solenoid
actuated.
Applications: Single inlet for Decay, Flow, and
Differential tests.
Dimensions – inches (mm)
2.80
(71.1)
1/8-27 NPT
(2 Places)
P2
P3
0.77
(19.7)
0.77
(19.5)
(10.7)
0.42
0.52
(13.2)
TEST
1.00
(25.4)
2.14 (54.4)
INLET
5.00 (127.0)
The LT 3/4 manifold has excellent flow, is compact and adaptable. This product
can be field configured for flow, pressure decay, or differential pressure testing
by selecting different combinations of the three sensor ports.
Port Size Model Number Avg.
1 2 NC C
V
Dimensions inches (mm) Weight
Length Width Height lb (kg)
1/4 1/4 LT32NA27500W 2.2 5.00 (127.0) 2.33 (59.2) 2.80 (71.1) 2.9 (1.3)
1/4-18 NPT
(2 Places)
PILOT
1/4-18 NPT
1/8-27 NPT
1.19
(30.2)
0.59
(14.9)
INLET
EXHAUST
P1
0.78
(19.7)
2.01 (51.1)
2.33 (59.2)
P1
EXHAUST
BOTTOM VIEW
0.75
(19.1)
PILOT
0.38 (9.58)
10-32
P2
TEST
3.00 (76.2)
P3
1/4-20
Mounting Holes
4/4 Manifolds
Manifold valve 4-port 4-position, normally closed.
Operator: External pilot, multi-solenoid
actuated.
Applications: Flow and Pressure Decay.
PILOT
INLET 1
Dimensions – inches (mm)
2.84
(72.1)
2.28
(57.9)
0.63
(16.0)
INLET 1
PILOT
1.25
(31.8)
EXH
1.25
(31.8)
INLET 2
1.66
(42.2)
INLET 2
Port Size Model Number Avg.
1 2 NC C
V
Dimensions inches (mm) Weight
Length Width Height lb (kg)
1/2 1/2 LT44NA47500W 5.0 5.13 (130.3) 3.75 (95.3) 2.84 (72.1) 3.2 (1.5)
BOTTOM VIEW
1.25
EXHAUST
5.13 (130.3)
TEST
3.75
(95.3)
(31.8)
1.25
(31.8)
2.81 (71.4)
TEST PORT
Mounting Holes
1.88
(47.8)
1.88
(47.8)
1/4-20 UNC
2.28
(57.9)
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All Rights Reserved.
Series LT Leak Test Valves & Manifolds
5/4 Manifolds
Manifold valve 5-port 4-position, normally closed.
Operator: External piloted, multi-solenoid
actuated.
Applications: Two channel Pressure Decay,
Differential Pressure.
Dimensions – inches (mm)
P1
3/4-14 NPT
P2
1/8-27 NPT
(2 Places)
Port Size Model Number Avg.
1 2 NC C
V
Dimensions inches (mm) Weight
Length Width Height lb (kg)
1/2 1/2 LT54NA47500W 5.0 5.13 (130.3) 3.75 (95.3) 2.84 (72.1) 3.2 (1.5)
PILOT
INLET 1
INLET 2
3.75
(95.3)
1.25
(31.8)
1.25
(31.8)
0.812
(20.6)
EXHAUST
BOTTOM VIEW
2.81 (71.4)
TEST 1
P1
TEST 2
1/4-20 UNC
Mounting Holes
1.88
(47.8)
P2
1.66
(42.2)
1/2-14 NPT
(2 Places)
5.13 (130.3)
0.56 (14.3)
TEST PORT
2
0.81
(20.6)
TEST PORT
1
0.81
(20.6)
1/2-14 NPT
(2 Places)
2.84
(72.1)
2.28
(57.9)
INLET 1
0.63
(16.0)
PILOT
1.25
(31.8)
EXH
INLET 2
1.25
(31.8)
The LT 4/4 and 5/4 manifolds are “all in one” directional control valves designed to fill, isolate, and test pressure containing vessels.
All manifolds contain integrated sensor ports for flow, pressure decay or differential pressure testing. With dual inlet ports, and
independent actuation of four internal poppets these manifolds also provide a flexible, high flow, compact air distribution solution
for many other applications.
* For 120 volts AC, 50/60 Hz, replace suffix “W” with “Z”, e.g., LT32NA27500Z.
Electrical connectors not included, see page 26 for ordering information.
STANDARD SPECIFICATIONS:
For Series LT 3/4, 4/4, 5/4 Manifolds.
Pilot Solenoid: DC power. Rated for continuous duty.
Standard Voltages: 24 volts DC; 120 volts AC, 50/60 Hz.
Power Consumption:
Per Solenoid: 3 VA on AC; 2.5 watts on DC.
Ambient/Media Temperature: 40° to 120°F (4° to 50°C).
Flow Media: Filtered air; 5 micron recommended.
Sensor Port: 1/8 NPT sensor ports.
Pilot Pressure: 50 to 145 psi (3.4 to 10 bar). Must be equal to
or greater than inlet pressure.
Inlet Pressure: 2 to 145 psi (0.13 to 10 bar).
Port Threads: NPT.
IMPORTANT NOTE: Please read carefully and thoroughly all of the CAUTIONS on the inside back cover.
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