Check-Q-meter type FD fit hydraulic systems for Rexroth
-Porting pattem to DlN 24 340, from D,ISO 5781 and CETOP-RP 121H
-Pilot operated check valve, leak-free,The check-Q-meter controls the returning flow qv2 in relation to the flow being directed into the opposite side of the actuater qv1. With cylinders the area tratio( qv2= qv1, φ ) has to be taken into account.
-By-pass valve, free-flow in opposite direction.
-Optional built-in secondary pressure relief valve(only for valve with flange connections).
Product features
◉ Porting pattem to DlN 24 340, from D,ISO 5781 and CETOP-RP 121H
◉ Pilot operated check valve, leak-free,The check-Q-meter controls the returning flow qv2 in relation to the flow being directed into the opposite side of the actuater qv1. With cylinders the area tratio( qv2= qv1, φ ) has to be taken into account.
◉ By-pass valve, free-flow in opposite direction.
◉ Optional built-in secondary pressure relief valve(only for valve with flange connections).
Functional section
Check-Q-meters are used in hydraulic systems to influence the speeds of hydraulic motors and cylinders independent of the load (prevents running away). In addition there is an isolator function for pipe burst safety. The check-Q-meter comprises basically of the housing (1), main poppet (2), pilot part (3), pilot spool (4), damping spool (5) and pilot damping (6).
Technical data
(for applications outside these parameters, please consult us!)
|
Parameter |
Unit |
Value |
|
Operating pressure, ports A, X |
(MPa) |
to 31.5 |
|
Operating pressure, port B |
(MPa) |
to 42 |
|
Pilot pressure, port X (flow control range) |
(MPa) |
min. 2 to 3.5, max. 31.5 |
|
Cracking pressure, A to B |
(MPa) |
0.2 |
|
Setting pressure for secondary pressure relief valve |
(MPa) |
to 40 |
|
Flow |
(L/min) |
80 (size12) 200 (size16) |
|
Area ratio of the pre-opening |
- |
poppet seat area / area of pilot spool = 1/20 |
|
Pressure fluid temperature range |
(°C) |
-30 to +80 |
|
Viscosity range |
(mm²/s) |
10 to 800 |
|
Pressure fluid |
- |
Mineral oil (for NBR seal) or Phosphate ester (for FPM seal) |
|
Notice |
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The fluid must be filtered. Minimum filter fineness is 20 μm. |
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The tank must be sealing up and an air filter must be installed on air entrance. |
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Products without subplate when leaving factory, if need them, please ordering specially. |
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Valve fixing screws must be high intensity level (class 10.9). Please select and use them according to the parameter listed in the sample book. |
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Roughness of surface linked with the valve is required to Ra 0.8 μm. |
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Surface finish of mating piece is required to 0.01/100mm. |
Characteristic curves
(measured at v = 41 mm² and t = 50°C)
◉ Pressure difference Δp in relation to flow q, measured at throttle position: Throttle fully open (Px = 6 MPa) B to A.
◉ Pressure difference Δp in relation to flow q, measured over the check valve A to B.
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