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Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
© 2008 Sun Hydraulics Corporation
Product Overview
PRESSURE CONTROLPRESSURE CONTROLCARTRIDGE VALVESCARTRIDGE VALVES
PRESSURE CONTROLPRESSURE CONTROLCARTRIDGE VALVESCARTRIDGE VALVES
© 2008 Sun Hydraulics Corporation2
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Pressure ControlsPressure ControlsPressure ControlsPressure Controls
• Relief• Sequence• Reducing• Reducing/Relieving
© 2008 Sun Hydraulics Corporation3
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
• Normally closed devices used to limit or regulate pressure
• Many variations to meet application requirements• Available in 2, 3, and 4 port configurations• Used to protect pumps or actuators, or maintain
constant system pressure• All hydraulic systems feature at least one relief valve
Pressure Controls - ReliefPressure Controls - ReliefPressure Controls - ReliefPressure Controls - Relief
© 2008 Sun Hydraulics Corporation4
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Relief Valve – Technical OverviewRelief Valve – Technical OverviewRelief Valve – Technical OverviewRelief Valve – Technical OverviewRP*C, Pilot Operated, Balanced Piston Relief
• Accurate pressure control• Low pressure rise with flow• Smooth and quiet• Moderately fast response time• Viscosity sensitive• Susceptible to silting
© 2008 Sun Hydraulics Corporation5
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Relief Valve – Technical OverviewRelief Valve – Technical OverviewRelief Valve – Technical OverviewRelief Valve – Technical OverviewRD*A, Direct Acting Relief
• Differential area design• Typically smooth and quiet performance• Essentially zero leak (suitable for load holding)• Dirt tolerant• Very fast response• Difficult to adjust under pressure• Higher pressure rise with flow
© 2008 Sun Hydraulics Corporation6
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Relief Valve – Technical OverviewRelief Valve – Technical OverviewRelief Valve – Technical OverviewRelief Valve – Technical OverviewAdvantages
Relief Valve Comparison
• Fast response• Low leakage• Dirt tolerant• Capable of operating over a wide
temperature range• Low over/undershoot• Common flow path with P/O design
• Wide pressure range• Low hysteresis• Easier to adjust when operating at
high pressures• Low override curve• Screened orifice• Common flow path with direct acting
2
1
Port 1 - InletPort 2 - Outlet 2
1
Port 1 - InletPort 2 - Outlet
Direct ActingRelief Valves
Pilot OperatedRelief Valves
(Sliding Spool)
© 2008 Sun Hydraulics Corporation7
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Relief Valve – Technical OverviewRelief Valve – Technical OverviewRelief Valve – Technical OverviewRelief Valve – Technical OverviewDisadvantagesRelief Valve Comparison
• Moderate hysteresis levels (not equivalent to P/O versions)
• Moderate pressure override• Multiple spring ranges required to
optimize performance• Difficult to adjust when operating at high
pressures
• Higher overshoot/undershoot potential• Internal leakage when closed• Temperature limitation• Contaminant sensitive in dirty
systems
2
1
Port 1 - InletPort 2 - Outlet 2
1
Port 1 - InletPort 2 - Outlet
Direct ActingRelief Valves
Pilot OperatedRelief Valves
(Sliding Spool)
© 2008 Sun Hydraulics Corporation8
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Relief Valve – Technical OverviewRelief Valve – Technical OverviewRelief Valve – Technical OverviewRelief Valve – Technical OverviewRP*S, Pilot Operated, Balanced Poppet Relief
• Combines features of pilot operated and direct acting relief valves• Smooth and quiet pressure regulation• Very low leakage• Dirt tolerant• Adjustable under pressure• Very fast response• Eliminates erosion cavity damage
© 2008 Sun Hydraulics Corporation9
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Relief Valve – Technical OverviewRelief Valve – Technical OverviewRelief Valve – Technical OverviewRelief Valve – Technical OverviewRBA*, Direct Acting, Pilot Stage Relief
• Remotely controls pressure setting of other pilot operated valves
• Capacity limited to pilot flow—should only be used with valves with comparable pilot flows
• Fast response
To SecondarySystem To System
RemoteControl or 2nd
SystemPressure
© 2008 Sun Hydraulics Corporation10
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Relief Valve – Technical OverviewRelief Valve – Technical OverviewRelief Valve – Technical OverviewRelief Valve – Technical OverviewRPGT, Pilot Operated, Balanced Poppet, Soft Relief
• Pilot-operated relief that limits maximum system pressure and also the rate of pressure rise
• Adjust screw determines the maximum setting and an initial (threshold) setting
• Valve opens at threshold and ramps closed (or to maximum setting) at a constant rate in about 250 ms
• Controlled rate of rise results in less dynamic stress in a system and no pressure spikes
© 2008 Sun Hydraulics Corporation11
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Relief Valve – Technical OverviewRelief Valve – Technical OverviewRelief Valve – Technical OverviewRelief Valve – Technical OverviewSoft Relief Function
© 2008 Sun Hydraulics Corporation12
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Relief Valve Response Comparison
Relief Valve – Technical OverviewRelief Valve – Technical OverviewRelief Valve – Technical OverviewRelief Valve – Technical Overview
Ultimate Pressure
System Designed
Maximum Pressure
System Designed
Maximum Pressure and
Ultimate Pressure
Threshold
Pressure
© 2008 Sun Hydraulics Corporation13
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Relief Valve – Technical OverviewRelief Valve – Technical OverviewRelief Valve – Technical OverviewRelief Valve – Technical OverviewRV*A, Ventable, Pilot Operated, Balanced Piston Relief
• Essentially a pilot-operated relief valve with a vent port that connects between the main piston and pilot stage
• Vent provides for remote control with other pilot or two-way valves by short circuiting the pilot stage
• If port 3 is blocked – valve operates as a standard relief If port 3 is open to tank – main section is wide open
• Same general characteristics as a pilot-operated relief valve
© 2008 Sun Hydraulics Corporation14
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Relief Valve – Technical OverviewRelief Valve – Technical OverviewRelief Valve – Technical OverviewRelief Valve – Technical OverviewRV*D, Ventable, Pilot Operated, Balanced Piston Relief
with External Drain
• Same as the RV*A valve except with a separate drain for the pilot stage• Valve is insensitive to back pressure at port 2• Can be thought of as a ventable sequence valve• Same general characteristics as a pilot-operated relief valve
© 2008 Sun Hydraulics Corporation15
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Relief Valve – Technical OverviewRelief Valve – Technical OverviewRelief Valve – Technical OverviewRelief Valve – Technical OverviewRQ*B, Pilot Operated, Kick-down Relief
• Act similar to a circuit breaker in an electrical system• When pressure at the inlet reaches the valve setting, valve
kicks completely open• Valve remains open as long as pressure at port 1 exceeds
pressure at port 2• To reset valve flow must cease• Same general characteristics as a pilot operated relief valve
© 2008 Sun Hydraulics Corporation16
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Pressure Controls - SequencePressure Controls - SequencePressure Controls - SequencePressure Controls - Sequence• Normally closed devices used to control a sequence of actions (similar
to a relief valve with separate drain line)• Supplies flow to a secondary circuit once the pressure at port 1 exceeds
the setting of the valve• Can be used as a relief if back pressure is present in system• Assures that a priority function is completed before a secondary function
begins– Insures a part is clamped before machining can begin– Insures a clam shell bucket is closed before it can be lifted
© 2008 Sun Hydraulics Corporation17
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Sequence Valve – Technical Sequence Valve – Technical OverviewOverview
Sequence Valve – Technical Sequence Valve – Technical OverviewOverview
SX*A, Direct Acting Sequence
• Similar construction to the RD relief valve• Setting of valve controls the pressure at port 1
relative to drain pressure at port 3• Extremely low leakage – suitable for load holding
© 2008 Sun Hydraulics Corporation18
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Sequence Valve – Technical Sequence Valve – Technical OverviewOverview
Sequence Valve – Technical Sequence Valve – Technical OverviewOverview
SC*A, Direct Acting with Reverse Flow Check Sequence
• Similar construction to the RD relief valve• Setting of valve controls the pressure at port 1
relative to drain pressure at port 3• Extremely low leakage – suitable for load holding• Incorporates an integral check valve to provide
reverse flow from port 2 (sequence) to port 1 (inlet).
© 2008 Sun Hydraulics Corporation19
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Sequence Valve – Technical Sequence Valve – Technical OverviewOverview
Sequence Valve – Technical Sequence Valve – Technical OverviewOverview
RS*C, Pilot Operated, Balanced Piston Sequence
• Similar construction to the RP relief valve• Setting of valve controls the pressure at port 1
relative to drain pressure at port 3• Insensitive to back pressure at port 2 – can be
used to regulate pressure in place of a two port relief valve if there is pressure in the return line
© 2008 Sun Hydraulics Corporation20
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Sequence Valve – Technical Sequence Valve – Technical OverviewOverview
Sequence Valve – Technical Sequence Valve – Technical OverviewOverview
RS*E, Air Controlled, Pilot Operated, Balanced Piston Sequence
• Similar to the RS*C expect this version uses compressed air over a diaphragm instead of an adjustable spring to control the pressure setting
• Air supplied in hex end of cartridge• Hydraulic setting is directly proportional to air pressure at
ratio of 20:1 (hydraulic:air)• Maximum air pilot pressure should not exceed 150 psi
© 2008 Sun Hydraulics Corporation21
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Sequence Valve – Technical Sequence Valve – Technical OverviewOverview
Sequence Valve – Technical Sequence Valve – Technical OverviewOverview
SQ*B, Kick-down Sequence
• Similar to the RQ*B in construction and function• When pressure at the inlet reaches the valve setting,
valve kicks completely open• Valve remains open as long as pressure at port 1
exceeds pressure at port 2• To reset valve flow must cease• Valve setting is insensitive to back pressure at port 2
One
Note:Pressure to cylinder 1 dropsto a low pressureafter valve shifts
Two
© 2008 Sun Hydraulics Corporation22
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Pressure Controls – ReducingPressure Controls – ReducingPressure Controls – ReducingPressure Controls – Reducing• Normally open, modulating device used to control the
pressure of a secondary circuit to a pressure below the main system pressure
• Different variations to meet application requirements• Used in many industrial applications
– Maintain a lower constant clamping pressure on a part when a higher pressure is needed for other functions in the circuit
© 2008 Sun Hydraulics Corporation23
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Reducing Valve – Technical Reducing Valve – Technical OverviewOverview
Reducing Valve – Technical Reducing Valve – Technical OverviewOverview
PB*B, Pilot Operating Reducing
System 2System 1
• Port 2 inlet• Exceptionally flat pressure vs. flow characteristic• Reverse flow from port 1 to port 2 may cause the valve
to completely shut – use a separate check for reverse free flow
• If pilot flow consumption is critical, use a direct acting reducer/reliever
© 2008 Sun Hydraulics Corporation24
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Reducing Valve – Technical Reducing Valve – Technical OverviewOverview
Reducing Valve – Technical Reducing Valve – Technical OverviewOverview
PR*R, Direct Acting Reducing
• Available in Series 1 through 4• Port 2 inlet• Can be used as an adjustable restrictive compensator• Damped construction provides more stable operation
© 2008 Sun Hydraulics Corporation25
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Pressure Control - Pressure Control - Reducing/RelievingReducing/RelievingPressure Control - Pressure Control -
Reducing/RelievingReducing/Relieving• Normally open, modulating devices that incorporate the relief function
with the reducing function• 3 and 4 port configuration• Under a backflow condition, valve relieves pressure at port 1 through
port 3 when relief setting is met (need full capacity at port 3)• Provides a controlled pressure and a constant counterbalancing force
for bi-directional elements
© 2008 Sun Hydraulics Corporation26
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Reducing/Relieving Valve – Technical Reducing/Relieving Valve – Technical OverviewOverview
Reducing/Relieving Valve – Technical Reducing/Relieving Valve – Technical OverviewOverview
PP*B, Pilot Operated Reducing/Relieving
• Similar to reducing valve with integral relief from port 1 to port 3
• Exceptionally flat pressure vs. flow characteristic• Reverse flow from port 1 to port 2 may cause the valve to
completely shut – use a separate check for reverse free flow• If pilot flow consumption is critical, use a direct acting
reducer/reliever
© 2008 Sun Hydraulics Corporation27
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Reducing/Relieving Valve -- Technical Reducing/Relieving Valve -- Technical OverviewOverview
Reducing/Relieving Valve -- Technical Reducing/Relieving Valve -- Technical OverviewOverview
PR*B, Direct Acting Reducing/Relieving
• Same function as PP*B with superior dynamic response• Suitable for accumulator circuits since the absence of pilot
flow results in less secondary circuit leakage• Provides highly reliable performance in contaminated
systems or in dead head conditions• Exhibit a transitional step between reducing and relieving
—may not be suitable for counterbalancing
© 2008 Sun Hydraulics Corporation28
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Reducing/Relieving Valve – Technical Reducing/Relieving Valve – Technical OverviewOverview
Reducing/Relieving Valve – Technical Reducing/Relieving Valve – Technical OverviewOverviewAdvantages
Reducing/Relieving Valve Comparison
• Fast response• Low pilot flow• Dirt tolerant• Capable of operating over a wide
temperature range• Low hysteresis• Common flow path with P/O design• Damped construction
• Wide pressure range• Low hysteresis• Low override curve• Screened orifice• Common flow path with direct acting• Low dead-band transition between
reducing and relieving• Stable performance
Direct ActingReducing/Relieving Valves
Pilot OperatedReducing/Relieving Valves
(Sliding Spool)
3 2
1
Port 1 - ReducedPort 2 - InletPort 3 - Tank
1
3 2
Port 1 - ReducedPort 2 - InletPort 3 - Tank
© 2008 Sun Hydraulics Corporation29
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Reducing/Relieving Valve – Technical Reducing/Relieving Valve – Technical OverviewOverview
Reducing/Relieving Valve – Technical Reducing/Relieving Valve – Technical OverviewOverviewDisadvantages
Reducing/Relieving Valve Comparison
• Steep regulation curve• High dead-band transition between
reducing and relieving• Multiple spring ranges required to
optimize performance
• Poor response time• Constant pilot flow when operating• Contaminant sensitive in dirty
systems
Direct ActingReducing/Relieving Valves
Pilot OperatedReducing/Relieving Valves
(Sliding Spool)
3 2
1
Port 1 - ReducedPort 2 - InletPort 3 - Tank
1
3 2
Port 1 - ReducedPort 2 - InletPort 3 - Tank
© 2008 Sun Hydraulics Corporation30
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Reducing/Relieving Valve - Technical Reducing/Relieving Valve - Technical OverviewOverview
Reducing/Relieving Valve - Technical Reducing/Relieving Valve - Technical OverviewOverview
PV*A, Pilot Operated Reducing/Relieving, Externally Drained
• Special version of pilot-operated reducing/relieving valve that is insensitive to pressure at port 3
• Pressure at port 4 is directly additive to the valve setting
• By controlling pressure at port 4, the effective setting of the valve can be increased over the valve setting
© 2008 Sun Hydraulics Corporation31
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Product/Company Introduction SeminarProduct/Company Introduction SeminarPressure Control Cartridge ValvesPressure Control Cartridge Valves
Reducing/Relieving Valve - Technical Reducing/Relieving Valve - Technical OverviewOverview
Reducing/Relieving Valve - Technical Reducing/Relieving Valve - Technical OverviewOverview
PV*B, Pilot Operated Reducing/Relieving, Ventable
• Special version of pilot operated reducing/relieving valve that is ventable at port 4
• Pressure at port 3 is directly additive to the valve setting
• By controlling pressure at port 4, the effective setting of the valve can be controlled below the valve setting