Liquid Controls LectroCount LCR-II E3655 Series Installation Manual page 20

valves
single stage valves (cont.)
Two stage systems
A2700 Series Electro-Pnuematic Valve
Electro-pnuematic valves use a S1 solenoid-operated
valve mounted to a pneumatic actuator to open and
close a V-7 valve. These valves are typically used in high
viscosity applications like lube oil.
S2 Solenoid
S1 Solenoid
LectroCount LCR-II
TWo sTaGe valves
A2848-11 Gallons
Solenoid-Operated
The three most common Liquid Controls meter systems
Block Valve
with two stage valves are: a block valve with a S1 and
a S2 solenoid-operated valve fitted onto external piping
(A2848-11), a block valve with a S2 solenoid-operated
valve (A2859-11) and a 3-way solenoid on the LCR-II,
Two Stage (S1 and S2)
and an E-7 valve with a S1 and a S2 solenoid-operated
Block Valve
valve.
A2848-11 Valve
This two stage control valve has a S1 and a S2 solenoid-
operated valve. The S1 solenoid-operated valve is
located at the meeting point of three bypass pipes: one
pipe from the inlet side of the valve, one from the top
of the block valve, and one from the outlet side of the
valve. The S2 solenoid valve is located on a bypass pipe
that connects the inlet and outlet sides of the control
valve. It opens while the control valve is closed to supply
2
the dwell flow. This valve is typically used in refined fuels
A2859-11
applications. Solenoid-Operated
Block Valve and
3-Way Solenoid
A2859-11 Valve and 3-Way Solenoid
A two stage valve with a S2 solenoid-operated valve
and a 3-way solenoid valve attached to the back of
the LectroCount LCR-II. The 3-way solenoid-operated
valve is located at the meeting point of two pipes from
Two Stage 3-Way Valve
with (S2) Block Valve
the vapor eliminator (one for eliminated vapor and
one leading to the spit tank) and one pipe to the top of
the block valve. The S2 solenoid valve is located on
a bypass pipe that connects the inlet and outlet sides
of the control valve. It opens while the control valve is
closed to supply the dwell flow. This configuration is
typically specified for products that hold vapor in the line
such as LPG and NH .
3
E-7 Valves
A two stage valve with a S1 and a S2 solenoid-operated
S2 Solenoid
valve. The E-7 valve is fitted with one external pipe to
S1 Solenoid
divert product flow to the closing mechanism. To supply
LectroCount LCR-II
E-7 Valve
Gallons
a dwell flow, the E-7 redirects the product around the
closed valve using channels molded into its housing.
This valve is typically used in refined fuels applications.
E-7 Valve
Two Stage (S1 and S2) E-7 Valve
20