The flow valve FD 12 is used in the hydraulic system to control the speed of the hydraulic motor and cylinder. It has high quality and cheap price. Huade Hydraulic successfully controls the cost of products and provides customers with affordable hydraulic FD check-Q-meter valves. One of the reasons for good quality is that Huade Hydraulic has a good inspection system. The factory has introduced more than 750 advanced equipment from all over the world. All the flow valves provided by Huade Hydraulic meets the international standards.
|
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.2to3.5, 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(℃) |
-30 to+80 |
|
Viscosity range(mm ²/s) |
10 to 800 |
|
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 FD12 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 Check-Q-Meter Valve FD 12
Symbol of Check-Q-Meter Valve FD 12
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, Qidong City, Jiangsu Province, China
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