SUN HYDRAULICS
SCEBCDN

***Disclaimer: The following summary contains information gathered from various sources such as product descriptions, technical specifications and catalogs. While efforts have been made to provide accurate details, inaccuracies may occur. It is advised to verify all information by contacting Sun Hydraulics directly.***
The Sun Hydraulics SCEBCDN (SCEBCDN) is an atmospherically referenced, direct-acting sequence valve with a reverse flow check feature. This valve is designed to supply a secondary circuit with flow once the pressure at the inlet port 1 surpasses the pre-set valve pressure. It incorporates an integral check valve to facilitate reverse flow from port 2 back to port 1, making it suitable for load-holding applications. The sequence valve controls pressure at port 1 relative to atmospheric venting, which is crucial in scenarios where a drain connection is not feasible. However, users should note that atmospherically referenced valves may experience external leakage or moisture ingress into the spring chamber over time, with approximately one drop (0.07 cc) of fluid entering the vented spring chamber every 4000 cycles. The SCEBCDN model features Sun's floating style construction, which reduces the risk of internal part binding due to excessive installation torque or variations in cavity/cartridge machining. The valve fits into a T-5A cavity and boasts a capacity of 30 gpm (120 L/min), with factory pressure settings established at 2 in/min (30 cc/min). It can withstand a maximum operating pressure of up to 5000 psi (350 bar), with typical response times around 2 milliseconds. The maximum allowable valve leakage at reseat is specified as 10 drops/min (0.7 cc/min), and it has a check cracking pressure of 25 psi (1.7 bar). For adjustments, five clockwise turns increase the setting, and it requires specific torque values for installation and adjustment components: Valve Hex Size - 1 1/8 in. (28.6 mm), Installation Torque - 45 to 50 lbf ft (61 to 68 Nm), Adjustment Screw Internal Hex Size - 5/32 in. (4 mm), Locknut Hex Size - 9/16 in. (15 mm), and Locknut Torque - 80 to 90 lbf in. (9 to 10 Nm). The model weight is .60 lb (.30 kg), and it uses Viton seal kits for cartridge sealing requirements.