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26 mar 2022 · The need for a better functioning of valve is fulfilled by the use of a pilot operated check valve. Pilot operated check valve allows the forward as well as reverse flow with the help a external pilot pressure signal. Basic types of pilot operated check valves are, 4C valve; 2C valve
These pilot operated check valves operate as a direct check valve but can also be opened by pilot pressure, on the control piston, to permit free reverse ow. The amount of pilot pressure required to open the valve is stated as a ratio of the pressure above the check to the pilot pressure.
Learn how to identify and use check valves, pilot operated check valves, and shuttle valves in hydraulic systems. See the symbols, examples, and functions of these valves with explanations and videos.
The following are ISO hydraulic check and pilot valve symbols commonly used on technical schematics.
Graphic symbol Description; check valve (non-return) spring-loaded check valve: pilot-operated check valve allowable flow direction: A1 → A2 (free flow) A2 → A1 (provided with X pilot signal) double pilot-operated check valve (hydraulic lock) allowable flow directions: A1 → A2 and simultaneously B2 → B1 B1 → B2 i and simultaneously A2 ...
The isolator valve type Z2S is a releasable check valve in sandwich plate design. It is used for the leakage-free blocking of one or two actuator ports, even for long standstill times. In direction A1 to A2 or B1 to B2, there is a free flow; in the opposite direction, the flow is blocked.
Pilot-to-open check valve (3 port) Pilot-to-open check valve (4 port or “vented”) Shuttle valve ... direct operated... Pressure reducing valve: pilot operated..... now showing: 3-way function... now showing: 3-way function Valve Symbols - Page 1 h y d ra u li c s o n li n e.c o m | p h o n e: + 4 4 (0)8 4 5-6 4 4-3 6 4 0.
