Pressure-relief valves are found in virtually every hydraulic system, and they assist in a variety of functions, from keeping system pressures safely below a desired upper limit to maintaining a set pressure in part of a circuit. Types include relief, reducing, sequence, counterbalance, and unloading. All of these are normally closed valves, except for reducing valves, which are normally open. For most of these valves, a restriction is necessary to produce the required pressure control. One exception is the externally piloted unloading valve, which depends on an external signal for its actuation.
Types of pressure relief valves :
sub plate –pressure relief valve – up to 400 bar pressure
Line mounted –pressure relief valve – up to 400 bar pressure
Catriage –pressure relief valve – up to 600 bar pressure
PCM – pressure control model.
Pressure reducing valve
A hydraulic valve properly directs the flow of a liquid medium, usually oil, through your hydraulic system. The direction of the oil flow is determined by the position of a spool. A hydraulic system can only function - as per requirements - by using valves. Thus, you should always look for the correct type of hydraulic valve to serve your intended purpose.
Hydraulic valves are available in a variety of sizes. The size required is determined by the maximum flow of the hydraulic system through the valve and the maximum pressure in the hydraulic system. Hydraulic valves are available with different mountings: e.g. mounting in pipe lines, threaded connection as cartridges, sub plate mounting, etc
Mobile valves are the ideal solution for all mobile applications in order to ensure the supply to all consumers.
Standard d.c vavles are mostly used for hydraulic machines and power packs.
Monoblock directional control valve
Sectional directional control valve
HAND LEVER OPERATED D.C. VALVE
Sub plate mounted D.C valve ( cetop3, cetop5, cetop8 )
Threaded body D.C valve ( ¼ ‘’ to ½ ‘’ b.s.p)
A solenoid valve is an electromechanically operated valve. The valve is controlled by an electric current through a solenoid: in the case of a two-port valve the flow is switched on or off; in the case of a three-port valve, the outflow is switched between the two outlet ports. Multiple solenoid valves can be placed together on a manifold.
Solenoid valves are the most frequently used control elements in hydraulics. Their tasks are to shut off, release, dose, distribute or mix fluids. They are found in many application areas. Solenoids offer fast and safe switching, high reliability, long service life, good medium compatibility of the materials used, low control power and compact design.
These are Solenoid Operated Directional Valves of high pressure, high flow and low pressure drop, the features of which can be materialized by employing a powerful wet type solenoid and the rational flow channel design.
Types of valves :
Sol. Operated Directional Valves
Sol. Controlled Pilot Operated Directional Valves
D.C. powered solenoid valves
A.C. powered solenoid valves
The fluid flow rate in a hydraulic system is controlled by flow control valve. Control of flow in a hydraulic system is critical because the rate of movement of fluid-powered machines or actuators depends on the rate of flow of pressurized fluid.
The basic function of the flow control valve is to reduce the volume of oil supplied in different places in a hydraulic circuit. Is a device used for adjusting or manipulating the flow rate of a liquid in a pipeline. The valve contains a flow passage or a port whose flow area can be varied. The role of the valve in a hydraulic circuit is very important and its very location is critical to optimum system performance.
An important application of this valve in hydraulic systems is: controlling the flow rate to cylinders and motors to adjust their speeds. Any flow decrease it means a speed decrease at the actuator.
Also builds added resistance to the circuit, increasing pressure, resulting in a partial bypassing of fluid over the relief valve or a de-stroking pressure of a compensated pump. This reduces flow downstream of the valve.
These valves are non-adjustable (fixed) or adjustable.
Type of valves:
Line mounted flow control valve ( ¼ ‘’, 3/8’’, ½’’, ¾’’ B.S.P)
Pressure compensated flow control valve ( up to 32 LPM / 315 bar )
Modular type throttle cum check valve
Flow divider valve ( 5 to 100 LPM / 315 bar )
hese type check valves allow free flow from port A to port B and give leak-proof closure in opposite direction. Available as inline mounting or Sub-plate mounting as per standard design.
These modular valves are available with the pilot operated check valve facility on either 'A' or 'B' ports. The hydraulic opening operation for free flow in reverse direction is achieved by means of internal pilot pressure available from the other working port.
These cartridge valves are suitable for mounting in manifold cavities machined as per size. By selecting suitable cartridge and cover, it is possible to achieve functions like Check valve Directional control valve, Unloading valve, Throttle valve etc. These valves offer fast response, have very low internal leakage and can handle very large flow rates.
Types of check valves:
Line mounted check valve ( NRV)
Sub plate mounted check valve
Piloted operated check vavle
Sub plate mounted pilot operated check valve
Modular type pilot operated check valve
Line mounted pilot operated check valve
Cartridge check valves ( 350 bar / up to 600 lpm )
Counter balance valve
Prefill valve ( 300 bar – high Lpm )