Products >> Hydraulic Valve >> SUN Hydraulic Valve

SUN check valve

Product No.：CBEA-LHN
Brand：SUN
Place of Origin：USA
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Product description：

Counterbalance valves with pilot assist are meant to control an overrunning load. The check valve allows free flow from the directional valve (port 2) to the load (port 1) while a direct-acting, pilot-assisted relief valve controls flow from port 1 to port 2. Pilot assist at port 3 lowers the effective setting of the relief valve at a rate determined by the pilot ratio.

Other names for this valve include motion control valve and over-center valve.

Counterbalance valves should be set at least 1.3 times the maximum load induced pressure.

Turn adjustment clockwise to decrease setting and release load.

Full clockwise setting is less than 200 psi (14 bar).

Backpressure at port 2 adds to the effective relief setting at a ratio of 1 plus the pilot ratio times the backpressure.

Reseat exceeds 85% of set pressure when the valve is standard set. Settings lower than the standard set pressure may result in lower reseat percentages.

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.

Sun counterbalance cartridges can be installed directly into a cavity machined in an actuator housing for added protection and improved stiffness in the circuit.

Two check valve cracking pressures are available. Use the 25 psi (1,7 bar) check unless actuator cavitation is a concern.

This valve does not have positive seals on the pilot section and will pass up to 2 in³/min.@1000 psi (32 cc/min.@70 bar ) between port 2 and port 3. This is a consideration in master-slave circuits and in the leak testing of valve-cylinder assemblies.

All 3-port counterbalance, load control, and pilot-to-open check cartridges are physically interchangeable (i.e. same flow path, same cavity for a given frame size).

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.

Cavity	T-2A
Cavity	2
Capacity	30 gpm
Pilot Ratio	3:1
Maximum Recommended Load Pressure at Maximum Setting	3075 psi
Maximum Setting	4000 psi
Pilot Configuration	Bleed through
Factory Pressure Settings Established at	2 in³/min.
Maximum Valve Leakage at Reseat	5 drops/min.
Adjustment - No. of CCW Turns from Min. to Max. Setting	3.75
Operating Characteristic	Standard
Reseat	>85% of setting
Valve Hex Size	1 1/8 in.
Valve Installation Torque	45 - 50 lbf ft
Adjustment Screw Internal Hex Size	5/32 in.
Locknut Hex Size	9/16 in.
Model Weight	0.29 kg.
Seal kit - Cartridge Buna	990202007
Seal kit - Cartridge EPDM	990202014
Seal kit - Cartridge Polyurethane	990002002
Seal kit - Cartridge Viton	990202006

Product features:

Maximum working pressure = 280 bar
Maximum internal leakage at reset = 0,4 cc/min.
The reset pressure is 85% higher than the set pressure
The factory setting pressure is set when the flow rate is 32,8 cc/min.
The maximum set pressure of the counterbalance valve should be 1.3 times the maximum load induced pressure.
The 2-port back pressure is directly applied to the set pressure of the valve

Product description：

CBEA-LHN
Flow(E)	Pilot Ratio（A)	Control(L)	Reverse Flow Check（H)	Seal Materia(N)
C 60 L/min.	A 3：1	L Screw Adjustment	H 70 - 280 bar	N：Buna-N
E 120 L/min.	B 1.5 ：1	C Tamper Resistant-Factory Set	I 25 - 105 bar	V：Viton
G 240 L/min.	Y 2:：1		A 70 - 280 bar
I 480 L/min.			B 25 - 105 bar