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Model

SQDBFAN

Control
Adjustment Range
Seal Material
Material/Coating

Kick-down, pilot-operated, balanced piston sequence valve

Cavity: T-11A | Capacity:

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Model

SQDBFAN

Control
Adjustment Range
Seal Material
Material/Coating

Technical specifications

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.
  • Corrosion resistant cartridge valves are intended for use in corrosive environments and are identified by the model code suffix /AP for external stainless steel components, or /LH for external zinc-nickel plated components. See the CONFIGURATION section for all options. For further details, please see the Materials of Construction page located under TECH RESOURCES.
  • 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
  • Series
  • Capacity
    15 gpm
  • Maximum Operating Pressure
    5000 psi
  • Factory Pressure Settings Established at
    Kick down point
  • Maximum Valve Leakage at 110 SUS (24 cSt)
    2 in³/min.
  • Response Time - Typical
    25 ms
  • Adjustment - No. of CW Turns from Min. to Max. setting
    5
  • Valve Hex Size
    7/8 in.
  • Valve Installation Torque
    30 - 35 lbf ft
  • Adjustment Screw Internal Hex Size
    5/32 in.
  • Locknut Hex Size
    9/16 in.
  • Locknut Torque
    80 - 90 lbf in.
  • Model Weight
    .40 lb
  • Seal kit - Cartridge
  • Seal kit - Cartridge
  • Seal kit - Cartridge

Model CAD Files

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Symbol CAD Files

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  • What parts of the Sun cartridge valve are field serviceable?
  • What are the tolerances on pressure settings for Sun's pressure control valves?
  • What does Sun mean by the term sequencing?
  • How big is a drop of hydraulic oil?  
  • For Series 1 cartridges configured with an O control (panel mount handknob), a .75 in. (19 mm) diameter hole is required in the panel.

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