shield machine Sectional Valves

GKV50 series Sectional Valves are not without their challenges. Since the entire valve is one casting, if it ever needs to be serviced then the whole valve must be removed. If there is a major problem with a section, the whole valve has to be scrapped, which is more expensive than just replacing a single bad section of a sectional valve. Most sectional valves are targeted for lower to medium flows and pressures, which helps keep cost, weight, and size down but also limits the applications they can be used in. A sectional valve is the most cost-effective, compact, and lightweight option when it comes to directional control valves when it fits the desired criteria of your system. If you have a varying system that requires a different number of sections from machine to machine and you want to cut down on inventory, then a sectional valve may be the way to go.

GKV 50 series sectional valves provide the following functions:

       ●  Inlet module with two stage relief valve

       ●  Inlet module with direct acting relief valve.

       ●  A /B port with overload valve on main section V

       ●  A port with overload valve on work section.

       ●  B port with overload valve on work section.

       ●  A port with dump valve

       ●  B port with dump valve

       ●  A/B port with a mechanical P.O check

       ●  A port with a mechanical P.O check

       ●  B port with a mechanical P.O check

       ●  End section with oil return port.

       ●  End section without oil return port.

       ● End section with power beyond port.

 GKV50 Series sectional valve provides the following features:

       ● Cast iron body (inlet section, main section and end section).

       ● Spring cap, mechanical detent cap, as well as electoral or hydraulic pilot controlled module body are made by cast aluminum or die cast aluminum.

       ● Parallel circuit, each section have its own load check valve, each section has load option relief option and relief style options.

       ● Can be changed to series circuit.

       ● Provides dump valve options for each center valve.

       ● Provides different drive modules (Hydraulic remote, manually control, wire driving).

       ● Provides power beyond port.   

       ●  Can be modified to be a closed center valve.

       ● Provides mechanical detent

       ● Provides options for mechanically actuated P.O check valves to satisfied with the needs for tractors and mobile cranes

       ● Provides different spool function to be used for controlling double acting, single acting cylinders, Hydraulic Motors

       ● Provides floating function for spools

       ● Provides excellent flow characteristics small operating force

       ● Can be assembled with 1-8 main sections

        Technical Data

          Rated Flow Rate: 50L/min

          Maximum Flow Rate: 60L/min

          Minimum Flow Rate: 20L/min

          Maximum Pressure at P port: 350bar

          Maximum Pressure at A.B port: 350bar

          Maximum Pressure at T port: 25bar

          Internal Leakage(@70bar)A.B to T: 25-35cc/min

          Internal Leakage(@70bar)A.B to T with P.O check: 2-5cc/min

          Spool Stroke(1.2position): +7/-7mm

          With flooating function(1.2position): +7/-7 -- 10mm

          Solenoid can be either 12 VDC or 24 VDC, corresponding current is 0-1.5 or 0-0,75 Amp

        Basic Operation Principle

         GKV50 series sectional valves is an open centered 3-position 4-way valve. When spool is in its neutral position, the flow from pump passes through the neutral             passage to tank, with small pressure drop. When one of the spool is moved to 1 or 2 position, the neutral passage is blocked. The flow from pump can only pass the     parallel passage to load check valve, then, passes through the bridge and spool opening to work port A or B.

         For multi-Section Valve, if one of the sections spool is in spool in or spool out position, then, there is no flow in its down stream sections neutral passage. Then main      throttle occurs on the valve opening between bridge passage and spool. The operator can control more than one spools, but the magnitude of the flow rate for each      controlled section depends on the magnitude of the load, as shown in drawing 3.

          When power beyond function is selected as shown in drawing 4,  when all spools are in neutral position, the flow from inlet passes neutral passage to power beyond    port to provide source of the flow to other auxiliary functions.

        Application Example

        3 Section Stack Valve

         Munual Control 3 Section Valve