LKFCZ | Electronics » Position Indication » Position Indication

These unbalanced poppet, logic valves are 2-way switching elements that are spring-biased closed. Pressure at either work port 1 or 2 will further bias the valve to the closed position while pressure at port 3 will tend to open it. The force generated at port 3 must be greater than the sum of the forces acting at port 1 and port 2 plus the spring force for the valve to open. NOTE: The pilot area (port 3) is 1.8 times the area at port 1 and 2.25 times the area at port 2.

This valve incorporates a position switch to provide confirmation that the valve is closed.

The position switch in this valve provides confirmation that the valve is closed.
Cartridges configured with EPDM seals are for use in systems with phosphate ester fluids. Exposure to petroleum based fluids, greases and lubricants will damage the seals.
These valves have positive seals between port 2 and the pilot area.
This cartridge is supplied as a sealed, factory set unit and is not field serviceable. Any tampering will violate the product warranty.
When torquing this cartridge into its cavity, a crow's foot wrench or similar will be required since the position switch precludes the use of a deep socket wrench.
Because these valves are unbalanced, operation is pressure dependent. Opening and closing of the poppet are functions of the force balances on three areas: Port 1 = 100%, Port 2 = 80%, and the Pilot Area = 180%.
These valves are pressure responsive at all ports, therefore it is essential to consider all aspects of system operation through a complete cycle. Pressure changes at any one port may cause a valve to switch from a closed to an open position, or vice versa. All possible pressure changes in the complete circuit must be considered to assure a safe, functional system design.
All ports will accept 5000 psi (350 bar).
Position switch is CE approved.
Incorporates the Sun floating style construction to minimize the possibility of internal parts binding due to excessive installation torque and/or cavity/cartridge machining variations.

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Note: Data may vary by configuration. See CONFIGURATION section.

Cavity	T-2A
Series	2
Capacity	20 gpm80 L/min.
Maximum Operating Pressure	5000 psi350 bar
Maximum Valve Leakage at 110 SUS (24 cSt)	1 drops/min.0,07 cc/min.
Pilot Volume Displacement	.06 in³0,98 cc
Pilot Passage into Valve	.035 in.0,9 mm
Area Ratio, A3 to A1	1.8:11.8:1
Area Ratio, A3 to A2	2.25:12.25:1
Transition leakage at 110 SUS (24 cSt)	2 in³/min.@1000 psi30 cc/min.@70 bar
Valve Hex Size	1 1/8 in.28,6 mm
Valve Installation Torque	45 - 50 lbf ft61 - 68 Nm
Model Weight	.90 lb0,41 kg
Seal kit - Cartridge	Buna: 990202007
Seal kit - Cartridge	EPDM: 990202014
Seal kit - Cartridge	Polyurethane: 990002002
Seal kit - Cartridge	Viton: 990202006

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Note: Data may vary by configuration. See CONFIGURATION section.

Supply Voltage	20-30 VDC20-30 VDC
Operating Temperature Range	-25 to 80 °C-25 to 80 °C
Vibration	≥ 50g, 0-500 impulses/sec≥ 50g, 0-500 impulses/sec
Shock	>50 g, 1ms>50 g, 1ms
Reverse Polarity Protection	YesYes
Maximum Output Load	≤ 400 mA, Duty Ratio 100%≤ 400 mA, Duty Ratio 100%
Short Circuit Protection	Yes, Load Short UnlimitedYes, Load Short Unlimited
Turn On Time	≤ 25 ms≤ 25 ms
Hysteresis	≤ .002 in.≤ .002 in.
Thermal Shift - 0 to 80 °C ≤ ±	.004 in.0,1 mm
EMC	DIN EN 61000-6-1/2/3/4DIN EN 61000-6-1/2/3/4
Connector	M12 X 1 (4) PinM12 X 1 (4) Pin
Connector Environment Rating	IP65IP65

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Performance Curve for LKFCZ: Pilot-to-open, spring-biased closed, unbalanced poppet logic element with position switch

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How big is a drop of hydraulic oil?

There are exactly 250 Sun drops in a cubic inch or 15 in a cc.

Direct acting or pilot operated - what do I use?

Direct-acting valves are used to prevent over pressure, and pilot-operated valves are used to regulate pressure. If you are unsure, use a direct-acting valve. Sun's direct acting valves are very fast, dirt tolerant, stable, and robust. Sun's pilot-operated valves are moderately fast, they have a low pressure rise vs. flow curve, and they are easy to adjust.

I need to discharge a large accumulator. How can I increase the capacity of my discharge circuit?

Because of the very high ratio, the COFO has limited capacity. The discharge path is across a .050 inch (1,3 mm) diameter orifice. If you have large accumulators combined with low precharge pressures, this may not discharge the energy quickly enough. Using the COFO XDN cartridge in conjunction with an LODA XDN will provide capacity for larger applications.

What parts of the Sun cartridge valve are field serviceable?

Only external seals are serviceable. Sun offers replacement seal kits for all cartridge models. The applicable kit part number can be found in the product page's Technical Data table or by using our Cartridge Seal Kit search function located under Accessories. Please note: Converting the external seals from one material to another does not ensure fluid compatibility with that material due to the existence of internal seals within the cartridge.

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