SUN HYDRAULICS
SEQUENCE VALVE
SCEALEN

***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 SCEALEN (SCEALEN) is a direct-acting sequence valve with an integrated reverse flow check, designed to supply a secondary circuit with flow once the inlet port pressure exceeds the valve setting. This valve features an integral check valve that allows reverse flow from port 2 to port 1. The sequence valve's pressure setting controls the pressure at port 1 relative to the drain port 3, and while it is a zero pilot flow valve, connecting port 3 is essential for maintaining a pressure reference in the control chamber. Blocking port 3 can lead to malfunction due to reciprocating seal weepage. The pressure at port 3 adds directly to the valve setting at a 1:1 ratio and should not exceed 5000 psi (350 bar). This product is suitable for load holding applications and offers interchangeable functionality across all three-port sequence cartridges, maintaining consistent flow paths and cavity dimensions for given frame sizes. It incorporates Sun's floating style construction to reduce binding risks from excessive installation torque or machining variations. The SCEALEN has a capacity of 30 gpm (120 L/min), with factory pressure settings established at 2 in\u00b3/min (30 cc/min) and a maximum operating pressure of 5000 psi (350 bar). Typical response time is around 2 ms, with maximum valve leakage at reseat being approximately 10 drops/min (0.7 cc/min). The check cracking pressure is set at 25 psi (1.7 bar), and adjustments can be made via clockwise turns to increase settings up to five times. Installation specifications include a hex size of 1-1/8 in. (28.6 mm) for the valve body, requiring torque between 45 - 50 lbf\u00b7ft (61 -68 Nm), and an internal hex size of 5/32 in. (4 mm) for adjustment screws, with locknut torque specifications ranging from 80 -90 lbf\u00b7in (9 -10 Nm). The model weighs approximately .60 lb (.30 kg) and utilizes Viton seals as part of its cartridge design.