Presentation is loading. Please wait.

Presentation is loading. Please wait.

Product/Company Introduction Seminar Pressure Control Cartridge Valves Product/Company Introduction Seminar Pressure Control Cartridge Valves © 2008 Sun.

Similar presentations


Presentation on theme: "Product/Company Introduction Seminar Pressure Control Cartridge Valves Product/Company Introduction Seminar Pressure Control Cartridge Valves © 2008 Sun."— Presentation transcript:

1

2 Product/Company Introduction Seminar Pressure Control Cartridge Valves Product/Company Introduction Seminar Pressure Control Cartridge Valves © 2008 Sun Hydraulics Corporation Product Overview PRESSURE CONTROL CARTRIDGE VALVES

3 Product/Company Introduction Seminar Pressure Control Cartridge Valves Product/Company Introduction Seminar Pressure Control Cartridge Valves © 2008 Sun Hydraulics Corporation 2 Pressure Controls Relief Sequence Reducing Reducing/Relieving

4 Product/Company Introduction Seminar Pressure Control Cartridge Valves Product/Company Introduction Seminar Pressure Control Cartridge Valves © 2008 Sun Hydraulics Corporation 3 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 - Relief

5 Product/Company Introduction Seminar Pressure Control Cartridge Valves Product/Company Introduction Seminar Pressure Control Cartridge Valves © 2008 Sun Hydraulics Corporation 4 Relief Valve – Technical Overview RP*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

6 Product/Company Introduction Seminar Pressure Control Cartridge Valves Product/Company Introduction Seminar Pressure Control Cartridge Valves © 2008 Sun Hydraulics Corporation 5 Relief Valve – Technical Overview RD*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

7 Product/Company Introduction Seminar Pressure Control Cartridge Valves Product/Company Introduction Seminar Pressure Control Cartridge Valves © 2008 Sun Hydraulics Corporation 6 Relief Valve – Technical Overview Advantages 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 - Inlet Port 2 - Outlet Direct Acting Relief Valves Pilot Operated Relief Valves (Sliding Spool)

8 Product/Company Introduction Seminar Pressure Control Cartridge Valves Product/Company Introduction Seminar Pressure Control Cartridge Valves © 2008 Sun Hydraulics Corporation 7 Relief Valve – Technical Overview Disadvantages Relief 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 - Inlet Port 2 - Outlet Direct Acting Relief Valves Pilot Operated Relief Valves (Sliding Spool)

9 Product/Company Introduction Seminar Pressure Control Cartridge Valves Product/Company Introduction Seminar Pressure Control Cartridge Valves © 2008 Sun Hydraulics Corporation 8 Relief Valve – Technical Overview RP*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

10 Product/Company Introduction Seminar Pressure Control Cartridge Valves Product/Company Introduction Seminar Pressure Control Cartridge Valves © 2008 Sun Hydraulics Corporation 9 Relief Valve – Technical Overview RBA*, Direct Acting, Pilot Stage Relief Remotely controls pressure setting of other pilot operated valves Capacity limited to pilot flowshould only be used with valves with comparable pilot flows Fast response

11 Product/Company Introduction Seminar Pressure Control Cartridge Valves Product/Company Introduction Seminar Pressure Control Cartridge Valves © 2008 Sun Hydraulics Corporation 10 Relief Valve – Technical Overview RPGT, 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

12 Product/Company Introduction Seminar Pressure Control Cartridge Valves Product/Company Introduction Seminar Pressure Control Cartridge Valves © 2008 Sun Hydraulics Corporation 11 Relief Valve – Technical Overview Soft Relief Function

13 Product/Company Introduction Seminar Pressure Control Cartridge Valves Product/Company Introduction Seminar Pressure Control Cartridge Valves © 2008 Sun Hydraulics Corporation 12 Relief Valve Response Comparison Relief Valve – Technical Overview Ultimate Pressure System Designed Maximum Pressure System Designed Maximum Pressure and Ultimate Pressure Threshold Pressure

14 Product/Company Introduction Seminar Pressure Control Cartridge Valves Product/Company Introduction Seminar Pressure Control Cartridge Valves © 2008 Sun Hydraulics Corporation 13 Relief Valve – Technical Overview RV*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

15 Product/Company Introduction Seminar Pressure Control Cartridge Valves Product/Company Introduction Seminar Pressure Control Cartridge Valves © 2008 Sun Hydraulics Corporation 14 Relief Valve – Technical Overview RV*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

16 Product/Company Introduction Seminar Pressure Control Cartridge Valves Product/Company Introduction Seminar Pressure Control Cartridge Valves © 2008 Sun Hydraulics Corporation 15 Relief Valve – Technical Overview RQ*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

17 Product/Company Introduction Seminar Pressure Control Cartridge Valves Product/Company Introduction Seminar Pressure Control Cartridge Valves © 2008 Sun Hydraulics Corporation 16 Pressure 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

18 Product/Company Introduction Seminar Pressure Control Cartridge Valves Product/Company Introduction Seminar Pressure Control Cartridge Valves © 2008 Sun Hydraulics Corporation 17 Sequence Valve – Technical Overview 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

19 Product/Company Introduction Seminar Pressure Control Cartridge Valves Product/Company Introduction Seminar Pressure Control Cartridge Valves © 2008 Sun Hydraulics Corporation 18 Sequence Valve – Technical Overview 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).

20 Product/Company Introduction Seminar Pressure Control Cartridge Valves Product/Company Introduction Seminar Pressure Control Cartridge Valves © 2008 Sun Hydraulics Corporation 19 Sequence Valve – Technical Overview 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

21 Product/Company Introduction Seminar Pressure Control Cartridge Valves Product/Company Introduction Seminar Pressure Control Cartridge Valves © 2008 Sun Hydraulics Corporation 20 Sequence Valve – Technical Overview 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

22 Product/Company Introduction Seminar Pressure Control Cartridge Valves Product/Company Introduction Seminar Pressure Control Cartridge Valves © 2008 Sun Hydraulics Corporation 21 Sequence Valve – Technical Overview 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 drops to a low pressure after valve shifts Two

23 Product/Company Introduction Seminar Pressure Control Cartridge Valves Product/Company Introduction Seminar Pressure Control Cartridge Valves © 2008 Sun Hydraulics Corporation 22 Pressure 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

24 Product/Company Introduction Seminar Pressure Control Cartridge Valves Product/Company Introduction Seminar Pressure Control Cartridge Valves © 2008 Sun Hydraulics Corporation 23 Reducing Valve – Technical Overview 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

25 Product/Company Introduction Seminar Pressure Control Cartridge Valves Product/Company Introduction Seminar Pressure Control Cartridge Valves © 2008 Sun Hydraulics Corporation 24 Reducing Valve – Technical Overview 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

26 Product/Company Introduction Seminar Pressure Control Cartridge Valves Product/Company Introduction Seminar Pressure Control Cartridge Valves © 2008 Sun Hydraulics Corporation 25 Pressure Control - Reducing/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

27 Product/Company Introduction Seminar Pressure Control Cartridge Valves Product/Company Introduction Seminar Pressure Control Cartridge Valves © 2008 Sun Hydraulics Corporation 26 Reducing/Relieving Valve – Technical Overview 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

28 Product/Company Introduction Seminar Pressure Control Cartridge Valves Product/Company Introduction Seminar Pressure Control Cartridge Valves © 2008 Sun Hydraulics Corporation 27 Reducing/Relieving Valve -- Technical Overview 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 relievingmay not be suitable for counterbalancing

29 Product/Company Introduction Seminar Pressure Control Cartridge Valves Product/Company Introduction Seminar Pressure Control Cartridge Valves © 2008 Sun Hydraulics Corporation 28 Reducing/Relieving Valve – Technical Overview Advantages 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 Acting Reducing/Relieving Valves Pilot Operated Reducing/Relieving Valves (Sliding Spool)

30 Product/Company Introduction Seminar Pressure Control Cartridge Valves Product/Company Introduction Seminar Pressure Control Cartridge Valves © 2008 Sun Hydraulics Corporation 29 Reducing/Relieving Valve – Technical Overview Disadvantages 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 Acting Reducing/Relieving Valves Pilot Operated Reducing/Relieving Valves (Sliding Spool)

31 Product/Company Introduction Seminar Pressure Control Cartridge Valves Product/Company Introduction Seminar Pressure Control Cartridge Valves © 2008 Sun Hydraulics Corporation 30 Reducing/Relieving Valve - Technical Overview 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

32 Product/Company Introduction Seminar Pressure Control Cartridge Valves Product/Company Introduction Seminar Pressure Control Cartridge Valves © 2008 Sun Hydraulics Corporation 31 Reducing/Relieving Valve - Technical Overview 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


Download ppt "Product/Company Introduction Seminar Pressure Control Cartridge Valves Product/Company Introduction Seminar Pressure Control Cartridge Valves © 2008 Sun."

Similar presentations


Ads by Google