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LEFC

Product catalog summary

Overview: The document provides detailed technical specifications and features of the Large Electronically Adjustable Proportional Pressure Compensated Flow Control (LEFC) valve. It highlights the advantages of electronic control over manual adjustments, offering precision and efficiency in flow management.

Features:

Precision ground heat-treated spool for durability.
Diamond honed spool bore for consistent fit and low leakage.
Each LEFC is tested for linearity and pressure compensation.
Standard 3-port design allows pressure compensated flow from two ports.
Optional manual override available for power loss situations.

Specifications:

Maximum cartridge input pressure: 3000 psi.
Tank port: #4 SAE with a maximum back pressure of 10 psi.
Weight: 32.75 lbs (14.9 kg).
Filtration requirement: 25-Micron or better.
Coil specifications: 12 VDC standard, 10.4 Ohms, 14 Watts, 1.15 Amp max, rated for 100% continuous duty cycle.
Operating temperature range: -20°F to 210°F (-30°C to 100°C).

Materials:

Cast iron body.
Heat-treated steel spools.
Buna N O’Rings.

Port Size and Flow Settings:

Standard port size: #16 SAE (1 5/16 – 12).
Flow settings: 0-45 gpm (0-170.3 lpm) and 0-55 gpm (0-208.2 lpm).

Coil Voltage and Terminal Options:

Coil voltage options: 12 VDC and 24 VDC.
Coil terminal options include double lead, double spade, Din 43650, female shroud with male pin, and male tower with female pin.

General Information: The LEFC is an electronically controlled version of the FC51 flow control valve, allowing proportional flow adjustment via a solenoid. It offers enhanced control and flexibility with options for coil voltage, terminal, and flow settings. The 2-port option allows for pressure compensated flow with the excess port plugged, requiring a pressure compensated pump.

Model Code Examples: Examples include LEFC164512LM and LEFC165512LM, indicating specific configurations of port size, flow rate, coil voltage, and terminal type.

Flow and Pressure Information: Graphs illustrate the relationship between pressure drop and flow rate for different valve settings, as well as the correlation between solenoid current and controlled flow.

Schematic and Dimensional Data: The document includes a schematic drawing and dimensional data for installation and integration of the LEFC valve.

Catalog excerpts

LARGE ELECTRONICALLY ADJUSTABLE PROPORTIONAL PRESSURE COMPENSATED FLOW CONTROL “LEFC” CONTROLLED FLOW (CF) TANK (10 PSI MAX BACK PRESSURE) PRECISION GROUND HEAT TREATED SPOOL that assures long life. DIAMOND HONED SPOOL BORE provides consistent spool fit with low leakage. EVERY LEFC IS TESTED for linearity and pressure compensation. STANDARD 3-PORT allows for pressure compensated flow out of two ports. OPTIONAL MANUAL OVERRIDE when electrical power is lost. See flow chart for capacity. Max. 3000 psi cartridge input pressure. Nominally Rated for 3000 psi (207 bar). Tank Port - #4 SAE (10 psi (0.69 bar) MAX. back pressure) Weight 32–3/4 lbs. (14.9 kg). 25-Micron Filtration or Better. Coil 12 VDC standard. 10.4 Ohms. 14 Watts. 1.15 Amp max. Rated 100% continuous duty cycle Pulse Frequency (90 to 110 Hz) Operating Temperature: -20 to 210F (-30 to 100C) Cast Iron Body. Heat Treated Steel Spools. Buna N O’Rings.

Open the catalog to page 1

LEFC – GENERAL INFORMATION The Brand, LEFC (large electronically adjustable proportional pressure compensated flow control) is an electronically controlled version of the original large FC51 style flow control valve. The LEFC performance as a flow control is very similar to the large FC51 because they both use the same spring and compensator spool. Thus, the control flow port (CF) and the excess flow port (EX) remain usable and pressure compensated. The main advantage of the LEFC over the large FC51 is that the flow can be adjusted proportionally with a solenoid instead of manually. The orifice...

Open the catalog to page 2

LEFC FLOW & PRESSURE INFO: Current vs. Dial Plate for EC-12-01, EC-12-01L and EC-12-02 Controlled Flow vs. Solenoid Current 45 gpm Valve with 50 gpm Input Solenoid Current (amps) Pressure Drop vs. Flow for 45 gpm Valve 0 SCHEMATIC DRAWING: CF-CONTROLLED FLOW PRIORITY PORT, PRESSURE COMPENSATED Pressure Drop vs. Flow for 55 gpm Valve Dial Plate (Percent) EX-EXCESS FLOW IS PRESSURE COMPENSATED. THE FLOW CAN BE USED TO DO WORK OR RAN BACK TO TANK. EC-SERIES ELECTRONIC CONTROLLER #4 SAE TANK PORT (10 PSI MAX BACK PRESSURE) VOLTAGE SOURCE PUMP LEFC VALVE Readings may vary slightly for every control...

Open the catalog to page 3

DIMENSIONAL DATA: CONTROL FLOW EXCESS FLOW 6.00" [152.4] #4 SAE TANK PORT (10 PSI MAX BACK PRESSURE) INLET MANUAL OVERRIDE

Open the catalog to page 4

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