Date

File namegrc_eng

07 Feb 2013

DIRECTIONAL, PRESSURE AND FLOW CONTROL VALVES

DIRECTION CONTROL PRESSURE CONTROL FLOW CONTROL

NON-RETURN VALVE (NR)

PILOT OPERATEDNON-RETURN VALVE(NRP)X

DISCRETE DCV

CONTINUOUS(PROPORTIONAL)DCV

PRESSURERELIEF(VL)

PRESSUREREDUCING(VR)

SEQUENCE(VS)

OVERCENTRE(OVC)

COUNTERBALANCE(VCB)

RESTRICTOR (ST)

TWO-PORT FLOW CONTROL (RQ2)

THREE-PORT FLOW CONTROL (RQ3)

FLOW DIVIDER/COMBINER (DIVF)

UNLOADINGVALVE (VU)

Date

File namelimpdir_eng

04 Jan 2013

s

T

p*

Q

p

(non linear behaviour)

saturation

regulating condition

k

T

ideal

x

p

p

SINGLE STAGE (DIRECT) PRESSURE RELIEF VALVE

FLOW-PRESSURE CHARACTERISTIC

POPPET EQUILIBRIUM (steady-state regulating condition)

FLOW EQUATION

D

Qmax

(flow throttled to tank as function of upstream pressure)

p'

IN REGULATING CONDITION THE VALVE HOLDS THEUPSTREAM PRESSURE IN THE RANGE p*-p' FUNCTIONOF THE SPRING STIFFNESS

IN SATURATION CONDITIONTHE VALVE IS EQUIVALENTTO A FIXED RESTRICTOR

Date

File name

Date

File nameVL_Ag_1.4mm_velfield

09 Jan 2014

VELOCITY FIELD

Date

File namevlimame_eng

07 Jan 2013

D

xF ,k0

P

St

s

s s

max

flow

spooldisplacement

area

St

1

2

s

max

Date

File namevlimame_eng

07 Jan 2013

0

0

saturation

AMESim SIMULATION OF A SINGLE STAGE PRESSURE RELIEF VALVESTEADY-STATE FLOW-PRESSURE CHARACTERISTIC

F0 = 367 N k = 20, 50, 80 N/mm D = 10 mm s0 = 0.5 mm Ce = 0.7 rho = 850 kg/m3

AMESim model

metering edge

Date

File namedistpress_FL

13 Jan 2014

THE FLOW FORCEflow force due to the change offluid momentum within the valve

IN OUT

v = fluid velocityx = spool position (x=0, valve closed)

IN OUT

The flow force tends always to close the valve

If the pressure drop is constant, then the flow forceis proportional to the flow area

F ,k0St

Date

File namevlim2_eng

15 Jan 2014

T

T

T

P P

P

Y

single stagepressure relief valveX

D px

note: in steady-state conditions

px

A A

SECT. A-A

DYNAMIC STUDY - REMARKS ON THE DYNAMIC RESTRICTOR

Dynamic restrictor (laminar)

pp*

F

Fm

pA

p1

p*

p2

pxxp

px p

x

px

px

px

p* p* p*< = >

Se

p

Q+0VL+

p

Q1 VL

p

Q+0 Se

p

Q+1

p

Q+0 VL

p

Q+0 Se

p*

p1

p2

px

p*

direct pilot

VL closed VL regulating

remote pilot

VL open

regulatingcondition

closing force

opening force

T

P

Y

Date

File namefplim_eng

22 Feb 2013

T

P

Y

X

"DIRECT" VS "REMOTE" PILOT IN A PRESSURE RELIEF VALVE

direct pilot inregulating condition

remote pilot,fully open

VALVE IN REGULATING CONDITION: movable element in equilibrium pressure drop across the metering edge

VALVE (FULLY) OPEN: movable element at full stroke (contact against

the end-stop) negligible (ideally null) pressure drop across the

meeting edge due to the very large flow area

p*

VLP

pilot stage setting

fm

F

p

opening force

closingforce

p*

px

FORCES ON THE MAIN STAGE

fm

if the pilot stage is shut (p = p < p*):

if the pilot stage regulates (p = p*)

p*

closing: pA + f opening: pA

p

closing: p*A + f opening: pA

the main stage is shut

if p = p* + f /A , the main stage regulates

x

x

m

m

S

Q = pilot flow ratepil

m

forces on the main stage of thepiloted (dual stage) relief valve

effectiveregulatedpressure

DUAL STAGE (PILOT) PRESSURE RELIEF VALVE

Date

File nameVLpilot_eng

19 Jan 2014

Date

File name

Date

File namer4v03_eng

11 Jan 2013

DUAL STAGE PRESSURE RELIEF VALVE (Denison R4V)

P T

YX P

X

Y

T

Date

File namesimVL1

27 Mar 2014

SIMULATION OF A DUAL STAGE RELIEF VALVE

S1

S2

PUMP FLOW RATE = 150 L/minD spool = 10 mmfm = 30 Ndiameter S1 = 1 mm

S2 S1

p*

p* = 45 bar

fm

Date

File namesimVL2

27 Mar 2014

SIMULATION OF A DUAL STAGE RELIEF VALVE

effective p* = 51.5 bar max pressure = 52.4 bar

p* pilot stage FORCES ON THE MAIN STAGE

p* pilot stage effective p*

Fm / A = 3.8 bar

Date

File namesimVL3

27 Mar 2014

WHAT HAPPENS IF THE DIAMETER OF THE FUNCTIONAL RESTRICTOR IS INCREASED?

THE PILOT STAGE SATURATES

THE PRESSURE DROP IS ALWAYS < Fm / A = 3.8 bar

THE CLOSING FORCE ON THE MAIN STAGE ISALWAYS > OPENING FORCE

THE VALVE IS NOT ABLE TOLIMIT THE PRESSURE

Date

File nameVLvent_eng

07 Jan 2013

VLP

fm

F

pp*

px

forces on the main stageof the piloted relief valve

opening force

closing force(vent valve OFF)

regulated pressure(vent valve OFF)

fm

closing force(vent valve ON)

regulated pressure(vent valve ON)

VALVE VENTING

p*

fm

X

P T

VENT VALVE OFFthe pressure onport P is limited to:

VENT VALVE ONpx = 0, the circuitupstream the reliefvalve is depressurized:

P T

YX

px

VENT VALVE

Date

File name

Date

File namer4v03_vent_nn

11 Jan 2011

DUAL STAGE PRESSURE RELIEF VALVE WITH VENT VALVE (vv01)

P T

VV01

Y

pilot stage

vent valve

mail stage

Date

File namesinglevsdualRV_eng

05 Feb 2014

A

p*P

St

p*

P

SINGLE VS. DUAL STAGE PRESSURE RELIEF VALVE

x = initial compression of the spring

A depends on the size of the valve (maximum flow)x must be limited to avoid excessive spring lengths

--> high p* values require springs with high stiffness k--> the valve becomes "less ideal", above all if highopenings are required (high flow rates)

low stiffnessspring(preload f )

IN THE PILOT STAGE:the surface of influence is small,the spring stiffness is high, but thestroke of the poppet is very small--> negligible variation of p*pil

IN THE MAIN STAGE:the stroke of the poppet can be high,but the stiffness of the spring is low--> negligible variation of fm

m

pil

SUITABLE FOR HIGH FLOW RATES

A

sp*

P

p

p

p

p

1

1

2

2

max

0

s

s

Date

File namelimrid_eng

07 Jan 2013

g

g

g

g

St

St

SINGLE STAGE

DOUBLE STAGE

p*

P

p1

p2

p1

p2

PRESSURE RELIEF VALVE VS. PRESSURE REDUCING VALVE

P

P

Date

File namerid_p_dir2_eng

18 Nov 2013

NOMINAL FLOW RATE: 40l/minMAXIMUM LINE PRESSURE: 350 bar

PRESSURE REDUCING VALVE - CARTRIDGE TYPE (Sun Hydraulics)

PRESSURE REDUCINGWORKING POSITION

ANTISHOCKWORKING POSITION

T P

A

P A

T

SPOOL

SLEEVE

METERING EDGES

DYNAMIC RESTRICTOR

Date

File nameVRappl_eng

08 Feb 2013

p*VR1 p*VR2 p*VR3

p*VL

APPLICATION OF PRESSURE REDUCING VALVESTO PROVIDE AN ADJUSTABLE REGULATED PRESSURE WHICH IS LOWER THAN SUPPLY PRESSURE

U1 U2 U3

Date

File namevridpil_eng

07 Jan 2013

DOUBLE STAGE PRESSURE REDUCING VALVEp1

p2

p*St

FORCES ON THE MAIN STAGE

if the pilot stage is shut (p = p < p*):

if the pilot stage regulates (p = p*)

closing: p A opening: p A + f

the main stage is fully open (saturation)

if p = p* + f /A , the main stage regulates

x

x

m

m

px

2

2

fm

2

pilot stage setting

effective

pressure

fm

F

p

closing force

openingforce

p*

regulated

forces on the main stage of thepiloted (dual stage) reducing valve

p = p1 22

closing: p A2 opening: p* A + f m

2

p > p1 2

In regulating conditions the valvereduces the pressure at the inlet (port 1)to a constant reduced pressure at port 2

Date

File nameVRcharpp1_eng

06 Feb 2014

II)

Q = constant

p*

A max

STEADY-STATE CHARACTERISTIC OF PRESSURE REDUCING VALVES

p2

p1

A increasing

A min

p*

p1 p2

I IIIII

REDUCED PRESSURE AS FUNCTION OF THE UPSTREAM PRESSURE

in regulating conditions p = p*2

in saturation A is constant and p is variable2

I) A = A max

III) A = A min

Date

File nameVRcharpQ_eng

06 Feb 2014

II)

p = constant1p*

A max

STEADY-STATE CHARACTERISTIC OF PRESSURE REDUCING VALVES

Q

p2

p1

A increasingA min

p*

p1 p2

I IIIII

REDUCED PRESSURE AS FUNCTION OF THE FLOW RATE

in regulating conditions p = p*2

p - p = constant21 Q is proportional to A

in saturation A is constant and p is variable2

I) A = A min

III) A = A max

constant

Date

File nameVridFC

15 Jan 2014

P A

x

x

REAL CHARACTERISTIC OF A PRESSURE REDUCING VALVEREGULATED PRESSURE AS FUNCTION OF FLOW RATE AT CONSTANT UPSTREAM PRESSURE

x = spool displacement (x = 0 at rest)

flow rate

p at

por

t A

A max

A min

p*

A

constant pressure drop --> flow force porportional to flow area A

increment of flow forceincrement of spring force

Date

File nameremVrid

31 Mar 2014

REMARKS ON PRESSURE REDUCING VALVES

p*VRp*VL

U

VR +p

Q2+

p

Q1G

+p Q

VL

+p Q

G

P

+ pQ

+p Q

+M

VR regulating:- the pressure 2 is imposed by VR- the pressure 1 must be ingoing --> VL must regulate

--> the flow rate is decided by the load

VRG

VLP

+ pQ

+p Q

+M

VL shut:- in the junction the pressure is imposed at the port 1- the pressure at port 2 is imposed by the load --> VR in saturation

--> the flow rate is decided by the pump

p

Q+1

p

Q+2

p

Q+

p

Q+

Qp

p

Q

p

Q

p

Q

Q

p

possible configurations of a two-port valve

p Q

Date

File namesfc1sd12-eng

12 Jan 2015

P

A Y

P A

Y

SINGLE STAGE SEQUENCE VALVE (Fluid Controls 1sd12)

P--> Athe user at port A is fed only when the pressure atport P achieves the cracking pressure p*

A --> Pfree flow

NOTICE THEEXTERNAL DRAIN !!!

Date

File namer4s03_eng

19 Apr 2013

DUAL STAGE SEQUENCE VALVE (Denison R4S)

A (IN) B (OUT)

X

A Ap

x

A B

S

mFa

Zp

f mY

X

Y

aA

Pz

Px

Date

File name

11 Jan 2013

A Ap

x

B

S

mFa

zp

f m

Y

VS

U1 (CLAMP)

U2 (DRILL)

APPLICATION OF A SEQUENCE VALVE

p*VL

A

pilot stageset pressure

SEQUENCED SERIES OF OPERATIONS IN A CLAMP AND DRILL CIRCUIT

1. The pump feeds U1 until pu1 < p*pil ; VS shut, pp = pu12. U1 stops, pp and pu1 increase up to p*pil ;3. The pilot stage regulates --> pz = p*pil and px > pz

--> control piston in contact against conical poppet4. pp reaches p*VS --> the pump feeds U2

pp

sequence valveset pressure

TO OBTAIN THE SEQUENCE: pu1 < p*vs < p*VL

Date

File nameVseq_function1_eng

11 Jan 2013

Date

File namevseq_function1_eng

11 Jan 2013

APPLICATION OF A SEQUENCE VALVE (2)

if pu2 remains < p*vs

A Ap

x

A BS

mFa

zp

f m

Y

VSGA (p*)

U1

U2

Ap

x

A BS

mFa

zp

f m

Y

VSGA (p*)

U1

U2

if pu2 > p*vs

pp

pp

pp = pu1 = p*vs main stage and pilot stage regulate control flow through pilot stage

pA, px, pz increase pz > p*pil --> pilot stage fully opens control piston stops flow through pilot stage pz = 0 --> main stage opens --> pp = pu1 = pu2

VS remains open until pu2 > Fm/A (< p*pil) --> hysteresis to avoid instability pp = max (p*vs, pu2)

--> clamping force always guaranteed

p

A

s

p

p

p

p

p

11

2

2

33

0

0

s

A

D

Date

File namereg_q2_eng

04 Feb 2014

TWO-PORT FLOW CONTROL VALVES (RQ2)

SMSM

SM

SM

SVP

SVP

SVPSVP

IN REGULATING CONDITIONSSVP MAINTAINS A CONSTANTPRESSURE DROP ACROSS SM

SM = metering restrictorSVP = piloted variable restrictor

IF SVP IS REGULATING THEN p > p > p(variable pressure drop across SVP)

1 2 3

notice that SVP "normally open"does not mean that it is always open !!!

fm

fm

Date

File namebasic_RQ2_eng

02 Apr 2014

Dp

Dp

p*Q

QQ

FA

A

p

disL

SM Dp

SM

ovxp

FLOW RATE CONTROL: simple restrictor vs. RQ2

with simple restrictor

p*RQ2

with RQ2

THE FLOW RATE DEPENDS ON THE LOAD

THE FLOW RATE DOES NOTDEPEND ON THE LOAD

A res

IN BOTH CASES THE PRESSURERELIEF VALVE MUST REGULATETO DISCHARGE THE EXCESS FLOW---> THE DELIVERY PRESSURE IS p*

Q = Q - Qdis p L

Date

File nameRQ2char

25 Jan 2013

A decreasing

I

II)

III

pSVPconstant

II

pSM

pOV

pOV

Q

Flow area A = constantSM

pSM = p* A SVP= variable

p*

SVP

if pOV A SVPthen

SM SVPSmax Smin

A minSVP

A

max

SVP

I) A SVP = max III) A SVP = min

In saturation Q is variable with pOV

Smin = equivalent restrictor SM + SPV(min) in seriesSmax = equivalent restrictor SM + SPV(max) in series

STEADY-STATE CHARACTERISTIC OF TWO PORTS FLOW CONTROL VALVES

Date

File namecarrq2_eng

09 Apr 2015

p OV

SM SVP

12 3

x, v increasing

F

x, v

F > 0

F < 0

REAL STEADY-STATE CHARACTERISTIC OF FLOW CONTROL VALVE RQ2

overall pressure drop

flow

rate

ASVP decreasing

x = SVP displacement(x=0 when Asvp is maximum)v = fluid velocity

ASVP max

ASVP min

ASM

F = force due to non-ideal behaviour

with Q ≈ constant

if ASVP decreases increment of spring

compression v increases

--> increment of flow force

high flow force

low flow force

p2

Date

File namereg_q3_eng

04 Feb 2014

0A

1p

s s0

Q

Q

1

3

2Q

SMSM

VLDVLD

THREE-PORT FLOW CONTROL VALVES (RQ3)

p*Q

Q

FA

p

p

Q = Q - Qdis p L

IN REGULATING CONDITIONSVLD MAINTAINS A CONSTANTPRESSURE DROP ACROSS SM

SM = metering restrictorVLD = differential pressure relief valve

the pump delivery pressure is

THE EXCESS FLOW IS DISCHARGED BY RQ3

mf

Date

File namerq3pil_eng

25 Jan 2013

p p1 3

0A

2p

x

Q

Q

1

2

3Q

p0

SM

VLD

VLSF SM

VL

VLD

THREE PORTS FLOW CONTROL VALVE WITHPRESSURE RELIEF VALVE ON THE USER LINE

p*VL

p*RQ3

px

VL is shut: VL regulates:

Date

File namerq3_oleostar_eng

05 Feb 2014

THREE-PORT FLOW CONTROL VALVE (OLEOSTAR VPR)

SM

VL

VLD

SFAP

T

B B

A

A

SM

VLD

SECT A-A

SECT. B-B

VL

Date

File namerq3compare_eng

22 Feb 2010

2g

1g

0g

0p

Q3

2

1

Q

Q

0ss

p2

A031

pp

2g

1g

0g

0p

Q3

2

1

Q

Q

0ss

p2

A031

pp CONTROLLED FLOW RATE: Q1 = Q2+Q3

Q1 DECIDED BY SM!!

AS A CONSEQUENCE EFFECTS UPSTREAM

SM CONTROLS Q2+Q3 AND NOT Q3 AS REQUIRED

THE ISSUE: DECIDE THE FLOW RATE Q3 USE OF A THREE PORTS FLOW CONTROL VALVE

INLET FLOW RATE TO THE VALVE

EXCESS FLOW THROTTLED TO TANK

CONTROLLED FLOW RATE DECIDED BY "SM"

SM

SM

VLD

VLD

A WRONG LAYOUT!!!

Date

File namecartridge0

26 Jan 2015

CARTRIDGE VALVES (SLIP-IN)

MANIFOLD

COVER

X

A

B

SLEEVE POPPET

S'

S

s = S'-S

A B

Xf m

CARTRIDGE VALVESMOUNTED IN A MANIFOLD

Date

File namenorrmcartridge1

09 Apr 2015

Installation roomfor cartridge valve,poppet design

Poppets with different area ratios

AA/AX ≤ 0,5 AA/AX = 1

Installation roomfor cartridge valve,active poppet insert

Active poppets

Installation roomfor cartridge valve,spool design

Spool

Orifice (restrictor)

Replaceable restrictor

Spring for inserts

control cover without ports

A

BB

Ports are located at the bottom and at the sides of the symbol

YZ2Z1X

X

control cover with pilot port

X

X

control cover with pilot port, with adjustablestroke limiter and remote control port

B

A

A two port cartridge valve symbol consists of two elements:the control cover and the cartridge. They can include furtherbasic elements or symbols

AA

AX

AA

AX

1 > AA/AX ≥ 0,5

B

A

X

CARTDRIGE VALVES - BASIC GRAPHIC SYMBOLS

area for pilotpressure

cover

cartridge

Date

File nameExamplesCartridgeFlow

CARTDRIGE VALVES - EXAMPLES

"External connectionsshall be drawn on the sides"

X

Piloted check valve Two-stage directional control valve

YXS+s

s

S

S s

D2/2 01

1) No pilot signal x --> D2/2 in position 0 --> p = p

Poppet equilibrium: p s = p s + f

--> the flow is possible only from B to A (p > p )

A

B

D4/2 01

S

S+ss

1) D4/2 in position 0 --> p = p

Date

File name

09 Apr 2015

opening: p S + p sA Bclosing: p (S + s) + fZ m

opening: p S + p sA Bclosing: p (S + s) + fX m

pZ

pA

pB

fm

pX

pB

pA

fm

AZ

B A m

B A

2) D2/2 in position 1 --> p = pBZ

Poppet equilibrium: p S = p S + f

--> the flow is possible only from A to B (p > p )A B m

A B

Ax

Poppet equilibrium: p s = p s + fB A m

If p < p the poppet remains closedB A

2) If D4/2 in position 1 --> p = 0x

--> closing force is only f (negligible) --> valve opensm

Date

File nameExamplesCartridgePress

01 Apr 2014

CARTDRIGE VALVES - EXAMPLES

1) If p < p* then:

p = p and the valve remains closed.

2) If p = p* then the pilot stage starts regulatingand keeps the pressure p constant and equal to p*:

The main stage starts regulating whenthe pressure in P is equal to:

1) If p < p* then p = p and the main stage remains fully open.

Fa: opening forceFc: closing force

The main stage starts regulating when:

Two-stage pressure relief valve

X

P

T

SFa: opening forceFc: closing force

Two-stage pressure reducing valve

X

YS

B

A

The main stage is normally open, the flow is from B to A.

Y

2) If p = p* then the pilot stage starts regulating andkeeps the pressure p constant and equal to p*:

The main stage is normally closed.

p

x p

p

A A B

Ax

x

p*px

fm

p*px

fm

Date

File name4k70_3d_views_eng

25 Jan 2013

DUAL STAGE CHECK VALVE (PILOT OPEN)CARTRIDGE CONSTRUCTION

A

B

X

X

CARTRIDGE

BALL POPPET

PILOTPISTON

XA

B

SAME SURFACES !!

MANIFOLD

X A B

Date

File name4k70_eng

25 Jan 2013

A

B

X

X A B

free flow only possible from A to B

reverse flow allowed from B to A

DUAL STAGE CHECK VALVE (PILOT OPEN)

Date

File namec4v03_nrp

08 Apr 2013

XY

AB

S+s

s S

PILOT OPERATED NON RETURN VALVE (Denison C4V)

B A

Y

X

free-flow: A to B;X absent: no flow from B to AX present: reverse flow from Bto A possible.

2: conical poppetwith flat planes

12

1: spool withfrontal milling

1+2

z

z

Date

File nameVLdiretta_atos_eng

07 Jan 2013

SINGLE STAGE PRESSURE RELIEF VALVE (ATOS ARE-15)

P

TCLEARANCE(DYNAMIC RESTRICTOR)

Date

File nameflowATOSdir

12 Jan 2015

FLOW FORCE COMPENSATION

pressure

velocity

openingforce

Date

File namevlimp_pil_agam10_eng

10 Jan 2013

DUAL STAGE PRESSURE RELIEF VALVE (ATOS AGAM10)

PT

NEEDLEPOPPET

POPPET

PILOT LINE

FUNCTIONAL RESTRICTOR

DYNAMIC RESTRICTOR

MAIN STAGE

PILOT STAGE

Date

File namefc1a30_eng

22 Mar 2013

DUAL STAGE PRESSURE RELIEF VALVE (FLUID CONTROL 1A30)

SPOOL TYPE - CARTRIDGE CONSTRUCTION

P

T

fm

p*S1

S2

FUNCTIONALRESTRICTOR S1

SPOOL (MAIN STAGE) BALL POPPET (PILOT STAGE)

DYNAMIC RESTRICTOR S2

INTERNAL DRAIN

limpprop_eng

24 Oct 2013

PROPORTIONAL PRESSURE RELIEF VALVE (Denison R4VP)

P T

G

G

X Y

YX

Date

File name

electric stage

mechanical stage

LVDT

solenoid

Date

File nameagir10-ridp_pil_eng

10 Jan 2013

DUAL STAGE PRESSURE REDUCING VALVE (ATOS AGIR10)

A

Y

S1

S2

fm2

f

pX

B

pA

m1

p*

B AY

B: feed pressureA: reduced pressure

Date

File name

Date

File namer4r06_eng

10 Jan 2013

DUAL STAGE PRESSURE REDUCING VALVE (Denison R4R)

P A

Y

A P

Y

px

p*

fm

Date

File nameR4R_Rq2

10 Jan 2013

AIM OF THE RQ2 UPSTREAM THE PILOT STAGEAMESim simulations: valve pressure setting: 150 bar SM and St diameters: 1 mm inlet pressure: from 0 to 300 bar

SM

layout without RQ2

P A

Ypx

p*

fm

St

P A

Ypx

p*

fm

Date

File namevrid_vent

26 Jan 2015

P A

Y

VENTstage

Y

P A

OPTIONAL VENT VALVE

VENT STAGEAT REST:

the valveallows the flowP --> A

VENT STAGEACTUATED:

the valveremains shut

Date

File nameAtosRQ2_qv06_eng

25 Jan 2013

TWO PORTS FLOW CONTROL VALVE (ATOS QV06)

SM

controlled flow from A to B; reverse flow (B to A) allowed through NR

AB

SVP

NR

SM

knob to set theSM flow area

A BSVP

SM

NR

Date

File namerq2_sez_fr_dx_eng

25 Jan 2013

SVP

B

A

A

A BSVP

SM

NR

SM

NR

TWO PORTS FLOW CONTROL VALVE

SM DOWNSTREAMPRESSURE ACTIVE INOPENING THE SVP

PRESSURE OF PORT AACTIVE IN CLOSING THE SVP

Date

File nameQV06_RQ2_flow_eng

25 Jan 2013

ATOS QV06 (RQ2): FLOW FIELD AT MAX FLOW RATE AND PRESSURE

FLOW CONTROL RANGE: 1.5 -11 L/minMAX PRESSURE 250 bar ; p (SM) = 5 bar

Date

File nameRQ2_Denison1

11 Feb 2014

TEMPERATURE COMPENSATED RQ2 (Denison 2F1C)

IN

OUT

SM

SVP

the density is function of the oil temperature

to improve the valve precision, the SM flow area must bereduced as the temperature increases

SM

SVP

NR

TEMPERATURESENSITIVEADJUSTABLEENDSTOP

Date

File nameRQ2_Denison2

05 Feb 2014

TEMPERATURE COMPENSATED RQ2 - CROSS SECTIONS

IN

SVP

SM

ADJUSTABLEDYNAMICRESTRICTOR

NR

OUT

ADJUSTABLEENDSTOP

CHAMBER CONNECTED TO OUTLETTHROUGH ADJUSTABLE RESTRICTOR

IN

T

REG

Date

File namerq3_2f94

13 Nov 2013

THREE-PORT FLOW CONTROL VALVE (Fluid Controls 2F94)

IN

T REG

SM

VLD

Date

File name

Date

File namerq3_2f94_fluid controls

24 Nov 2011

IN

T

REG

VELOCITY FIELD

SM

IN

VLD

T REG

Date

File nameAtos_rq3_eng

12 Nov 2013

P

SMA

PP

VLD

SM

pA

SM

to VLD

T P

A

T

P A

TVLD

THREE-PORT FLOW CONTROL VALVE (ATOS QV-10)

not used