Pilot-operated, balanced poppet sequence valve

Capacity: 60 gpm240 L/min. | Cavity: T-17A
RSHS : Pilot-operated, balanced poppet sequence valve
Technical Features [ + ]

Pilot-operated, balanced poppet sequence valves will supply a secondary circuit with flow once the pressure at the inlet (port 1) has exceeded the valve setting. The pressure setting of a sequence valve controls the pressure at port 1 relative to the pressure at the drain (port 3). These valves are insensitive to back pressure at port 2 (sequence), up to the valve setting. They may be used to regulate pressure in place of 2-port relief valves if there is pressure in the return line.

  • Pilot flow continues to increase as the pressure at port 1 (inlet), relative to the pressure at port 3 (drain), rises above the valve setting.
  • 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).
  • Suitable for use in load holding applications.
  • Because the modulating occurs inside the cartridge these valves are immune to most of the problems associated with cavitation, namely noise and manifold erosion.
  • Will accept maximum pressure at port 2; suitable for use in cross port relief circuits.
  • All 3 port sequence cartridges are physically and functionally 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.
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Technical Data [ + ]
Note: Data may vary by configuration. See CONFIGURATION section.
Cavity T-17A
Series 3
Capacity 60 gpm240 L/min.
Maximum Operating Pressure 5000 psi350 bar
Factory Pressure Settings Established at 4 gpm15 L/min.
Maximum Valve Leakage at Reseat 10 drops/min.0,7 cc/min.
Response Time - Typical 10 ms10 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: 990217007
Seal kit - Cartridge Polyurethane: 990217002
Seal kit - Cartridge Viton: 990217006
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Performance Curves [ + ]
Performance Curve for RSHS: Pilot-operated, balanced poppet sequence valve Performance Curve for RSHS: Pilot-operated, balanced poppet sequence valve
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FAQs [ + ]
What does Sun mean by the term sequencing?

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.

What are the tolerances on pressure settings for Sun's pressure control valves?

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.

How big is a drop of hydraulic oil?  

There are exactly 250 Sun drops in a cubic inch or 15 in a cc.

What parts of the Sun cartridge valve are field serviceable?
Only external seals are serviceable.  Sun offers replacement seal kits for all cartridge models. The applicable kit part number can be found in the product page's Technical Data table or by using our Cartridge Seal Kit search function located under Accessories. Please note: Converting the external seals from one material to another does not ensure fluid compatibility with that material due to the existence of internal seals within the cartridge.
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  • RSHS8Pilot-operated, balanced poppet sequence main stage with integral T-8A control cavity
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Additional Resources [ + ]
Highlights
Technical Tips
Technical Information
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