Check-Q-meter valve FD 25 is a special valve device, which is mainly used to maintain the flow balance in the hydraulic system and ensure the stable operation of the system. The reason why Huade® FD 25 check-Q-meter valves win wide user trust is mainly due to its high quality and relatively lower price. The packaging of the products can be customized, such as standard carton packaging, wooden box packaging, plywood box packaging, plastic waterproof packaging, etc.
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Operating pressure, ports A, X (MPa) |
to 31.5 |
|
Operating pressure. port B (MPa) |
to 42 |
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Pilot pressure, port X (flow control range) (MPa) |
min.2to3.5, max.31.5 |
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Cracking pressure, A to B (MPa) |
0.2 |
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Setting pressure for secondary pressure relief valve (MPa) |
to 40 |
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Flow (L/min) |
80 (size12) 200 (size16) |
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Area ratio of the pre-opening |
poppet seat area/area of pilot spool=1/20 |
|
Pressure fluid temperature range(℃) |
-30 to+80 |
|
Viscosity range(mm ²/s) |
10 to 800 |
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Pressure fluid |
Mineral oil(for NBR seal),or phosphate ester(for FPM seal) |
Features:
▶ Porting pattern to DIN 24 340, from D,ISO 5781 and CETOP - RP 121H
▶ Pilot operated check valve, leak-free. The check-Q-meter controls the returning flow Q2 in relation to the flow being directed into the opposite side of the actuator Q1 with cylinders the area ratio ( Q2=Q1φ ) 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).
Application:
Check-Q-meters valves FD25 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 isolated 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).
Structure of FD Check-Q-Meter Valve
Symbol of FD Check-Q-Meter Valve
Circuit examples
Note:
Two check-Q-meters cannot be used to control two cylinders which are forced mechanically to move together, as synchronization and the same pressure cannot be guaranteed in each cylinder.
Therefore, the cylinders have to be equipped with two pilot operated check valves, type SL.The check-Q-meter is fitted in a common line.
In this case, the load pressure must not exceed 20MPa!
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No. 27, Yangsha Road, Huilong Town, Nantong City, Jiangsu Province, China
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