Kick-down, pilot-operated, balanced piston sequence valve
![SQHB : Kick-down, pilot-operated, balanced piston sequence valve](https://cmsimages.sunhydraulics.com/cartg_sqhb.gif)
Kick-down sequence valves will kick completely open and remain open once the pressure at the inlet (port 1) exceeds the valve setting, creating an unrestricted flow path from port 1 to port 2 (sequence). The pressure setting at port 1 is relative to the drain (port 3). The valve remains open as long as the pressure at port 1 exceeds the pressure at port 2. To reset the valve, pressure at port 1 must fall below the setting of the valve, flow from port 1 to port 2 must cease, and pressure at port 2 must be equal to or greater than the pressure at port 1.
- All 3 port sequence cartridges are physically and functionally interchangeable (i.e. same flow path, same cavity for a given frame size).
- Should not be used in load holding applications.
- The main stage orifice is protected by a 150 micron stainless steel screen.
- Pressure at port 3 is directly additive to the valve setting at a 1:1 ratio and should not exceed 5000 psi (350 bar).
- Intended for use on the actuator side of the system as flow through the valve must cease for the valve to reset. If used on the pump side of a system, pump flow must be shut off for the valve to reset.
- 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-17A |
Series | 3 |
Capacity | 60 gpm240 L/min. |
Maximum Operating Pressure | 5000 psi350 bar |
Factory Pressure Settings Established at | Kick down pointKick down point |
Maximum Valve Leakage at 110 SUS (24 cSt) | 4 in³/min.65 cc/min. |
Response Time - Typical | 25 ms25 ms |
Adjustment - No. of CW Turns from Min. to Max. setting | 55 |
Valve Hex Size | 1 1/4 in.31,8 mm |
Valve Installation Torque | 150 - 160 lbf ft203 - 217 Nm |
Adjustment Screw Internal Hex Size | 5/32 in.4 mm |
Locknut Hex Size | 9/16 in.15 mm |
Locknut Torque | 80 - 90 lbf in.9 - 10 Nm |
Model Weight | 1.50 lb0,70 kg |
Seal kit - Cartridge | Buna: 990017007 |
Seal kit - Cartridge | Polyurethane: 990017002 |
Seal kit - Cartridge | Viton: 990017006 |
There are exactly 250 Sun drops in a cubic inch or 15 in a cc.
A sequence valve opens when the pressure at port 1 exceeds the setting of the valve. When pressures at port 1 and port 2 both exceed the setting of the valve the valve goes full open, or sequences. When this happens flow can go in either direction, just so long as port 1 stays above the setting.
Pressure setting tolerances are listed in our Performance Data page. A link to this page can also be found in the Additional Resources tab of the applicable product page.
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