Parker D1VW in NG06 (CETOP 03) Solenoid Operated Directional Control Valves Suppliers in Ahmedabad Mumbai Chennai Bangalore Hyderabad Nashik Pune Jaipur Indore Kolkata Delhi Jharkhand Surat Rajkot India
Parker D1VW in NG06 (CETOP 03) Solenoid Operated Directional Control Valves Suppliers in Ahmedabad Mumbai Chennai Bangalore Hyderabad Nashik Pune Jaipur Indore Kolkata Delhi Jharkhand Surat Rajkot India
Parker D1VW in NG06 (CETOP 03) Solenoid Operated Directional Control Valves Suppliers in Ahmedabad Mumbai Chennai Bangalore Hyderabad Nashik Pune Jaipur Indore Kolkata Delhi Jharkhand Surat Rajkot India
Parker D1VW in NG06 (CETOP 03) Solenoid Operated Directional Control Valves Suppliers in Ahmedabad Mumbai Chennai Bangalore Hyderabad Nashik Pune Jaipur Indore Kolkata Delhi Jharkhand Surat Rajkot India
The D1VW in NG06 (CETOP 03) is an on/off valve which provides high functional limits in combination with a very low, energy-saving pressure drop. It is optionally available with soft shift option or as explosion proof version according to ATEX and IECEx.
The D1VW with explosion proof solenoids is based on the standard D1VW series. The specific solenoid design allows the usage in hazardous environments. The explosion proof class is Ex e mb II T4 Gb for use in zone 1 and 2 (according to ATEX). Additionally the solenoids are IECEx compliant. All explosion proof solenoids are DC design. The valves for AC operate with integrated rectifier
D1VW Series - Double solenoid, 2 position, detent - NFPA D03 (CETOP 3, NG 6)
Mechanical Servo Valves
Pilot Operated Directional Vales
Solenoid Operated Check Valves
Solenoid Operated Check Valves
Modular Pressure Control Valves
Modular Flow Control Valves
Modular Flow Control Valves
Modular Compound Valve
Pressure Control Valves
Solenoid Operated Cartridge Valves
Hydraulic Valves: Directional Valve, Pressure Control Valve, Flow Control
Valves in in Ahmedabad Mumbai Chennai Bangalore Hyderabad Nasik Pune Jaipur
Indore Delhi Harayana Noida Kolkata India
Hydraulic Valves: Directional Valve, Pressure
Control Valve, Flow Control Valves in in Ahmedabad Mumbai Chennai Bangalore
Hyderabad Nasik Pune Jaipur Indore Delhi Harayana Noida Kolkata India
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,
subplate mounting, etc.
Different Types of Hydraulic Valves
Hydraulic valves are sometimes referred to as
hydraulic components. These are subdivided into three main categories:
directional control valves, pressure control valves and flow control valves. We
have added proportional and servo control hydraulic valves as a separate
category below:
Directional Control Valves
·
Check valve;
·
Directional spool
valve
·
Directional
poppet valve
Pressure Control Valves
·
Control task:
variable throttle valve
·
Switching task:
fixed throttle valve
Flow Control Valves
·
Throttle valve:
flow Δp dependent
·
Control valve:
flow Δp independent
Electro Hydraulic Valves
·
Servo hydraulic
valve
·
Proportional
hydraulic valve
Different valves function in different ways. Check
valves permit free flow in one direction and block flow in the opposite
direction. The directional control valve is used to pass on the pressure medium
(i.e. flow) in an orderly fashion to a particular direction. Pressure control
valves switch (or control) at a certain pressure; the switching pressure may be
adjusted on the valve. Flow control valves regulate the flowthis is done by
adjusting the size of the bores (orifices).
Note that proportional hydraulic valves and servo
control valves may be used to perform a directional control, pressure control
or flow control function.
Directional Control Valves
Directional control valves can control the start,
stop and change in direction of flow of a pressure medium (i.e. hydraulic oil).
For this reason, they are also referred to as switching valves. Directional
control valves are available as spool valves, poppet valves or rotary slide
valves. Rotary slide valves, however, are no longer commonly used due to low
operating pressure (up to 70 bar).
The performance of a directional control valve
depends on the following:
·
Dynamic power
limit (as a function of maximum flow and pressure)
·
Static power
limit (adhesive force may be produced between the spool and housing due to
standstill)
·
Resistance to
flow (internal resistance, i.e. pressure drop)
·
Leakage (spool
valves only)
·
Switching time
(time between the actuating force and the completion of the stroke of the
control element)
The function of a directional control valve is
determined by the number of working ports (excluding control ports) and the
number of spool positions. A directional control valve comprises at least two
spool (switching) positions and two working ports. The most common directional
control valve is a 4/3-way valve, which means the valve has four working ports
and three spool positions, in accordance with DIN ISO 1219.
Check Valve
A check valve is the simplest type of directional
control valve used in hydraulic systems. Check valves stop the flow of fluid in
one direction and allow free flow in the opposite direction. They are also
known as non-return valves. Check valves may be used as:
·
Prefill valves (anti-cavitation)
·
Bypass valves
(e.g. throttling points or return-line filters)
·
Stops for flow
in one direction
·
Pre-tensioning
by creating a certain backpressure
·
Protection of
hydraulic components against pressure surges
Most check valves are spring-loaded and use a ball
or plate to seal the flow in one direction. Check valves are designed with
seats and thus are able to isolate circuits with no leakage. Balls, plates,
poppets or poppets with soft seals are used as isolating elements.
There is a special type of check valve that
prevents pistons or cylinder plungers from coming down and causing accidents.
This is called a line rupture valve. When the line ruptures, the flow through
the line rupture valve increases substantially, causing an increased pressure drop.
This in turn creates a stronger force on the ball, which will close
immediately.
Other special types of check valves are
pilot-operated check valves and shuttle valves. A pilot-operated check valve
allows flow in either direction by application of an external pilot pressure
signal. A shuttle valve permits free flow at the highest operating pressure.
Directional Spool Valve
Directional spool valves comprise a moving spool
situated in the valve housing. When an actuating force moves the control spool,
the annular channels in the housing are connected or separated. Directional
spool valves have several unique features, such as:
·
Low cost due to
simple design
·
Low actuating
force (due to good pressure compensation)
·
High switching
power
·
Low losses (even
though oil leakage flows continuously from the high pressure to the low
pressure side)
·
Wide variety of
control functions
Directional spool valves may be direct-operated or
pilot-operated. A direct-operated spool valve is either electrically controlled
with solenoids, mechanically (e.g. manually) controlled with levers or rollers,
or controlled with hydraulics or pneumatics. Whether a directional spool valve
is direct- or pilot-operated depends on the actuating force needed to move the
spool. Thus, this is dependent on the flow, i.e. nominal size of the
directional spool valve.
When valves are operated at higher hydraulic system
operating pressures, leakage losses around the spool and the housing should be
taken into account, especially at system pressures over 350 bar. The leakage
loss is determined by the size of the gap between the spool and the housing,
the viscosity of the hydraulic fluid and the hydraulic system pressure.
Typical parameters of spool valves are:
·
Nominal sizes:
NG6 and NG10 (up to NG120 for pilot-operated valves)
·
Maximum flow: up
to 150 l/min (up to 7,000 l/min for pilot-operated valves)
·
Maximum
pressure: up to 350 bar
Directional Poppet Valve
Directional poppet valves can operate at a maximum
operating pressure of up to 1,000 bar. Directional poppet valves are
directional control valves that are fitted into housing bores with a threaded
connection. This is why they are often referred to as hydraulic cartridge
valves. The moveable seating elements may consist of balls, poppets or plates.
Key features of hydraulic cartridge valves:
·
No leakage
·
Long product
life
·
High maximum and
continuous operating pressures due to zero leakage losses
·
Very good
sealing characteristics without additional isolating elements
The design permits the valve to become more tightly
sealed when operating pressure increases. The maximum flow of cartridge valves
is limited compared to spool valves. Larger flows would require larger
cartridges to fit into housing bores; the threaded connection will not hold.
Typical parameters of poppet valves are:
·
Nominal size:
NG6 and NG10, SAE, and ¼" - 2" BSP
·
Maximum flow: up
to 60 l/min (up to 400 l/min for pilot-operated valves)
·
Maximum
pressure: up to 1,000 bar
Pressure Control Valves
Every pressure control valve switches (or controls)
at a predetermined pressure setting. The switching pressure is generally a
variable setting on the valve itself. A change in position of the pressure
control valve (i.e. open or closed) occurs either gradually (by control) or
suddenly (by switch). Pressure control valves can be subdivided into control
and switching task:
Control task (variable throttle)
·
Pressure relief
valves
·
Pressure
reducing valves
·
Pressure drop
valves
·
Pressure
difference valves
·
Pressure valves
with additional electric switch-off
Switching task (fixed throttle)
·
Pressure
shut-off valves
·
Pressure
sequence valves
Sequence valves are used to direct the flow to a
secondary circuit. When the primary hydraulic circuit reaches a preset
pressure, flow is permitted to the secondary circuit. Unloading valves are
remotely-piloted pressure shut-off valves that direct flow to the tank when the
preset pressure in a particular location of the hydraulic circuit has been
reached.
The most common types of pressure control valves
are the pressure relief valve and the pressure reducing valve. Pressure relief
valves control the system pressure by relieving part, or all, of the flow to
tank. Pressure reducing valves reduce the pressure supplied to a sub-system of
a hydraulic system.
Pressure control valves may be directly or pilot
operated. Larger flows require larger spools or poppets, which increases the
area of the spring diameter: the spring force increases proportionally.
Pilot-operated pressure control valves require only a small spring, are
suitable for compact space requirements and have maximum flows of up to 650
l/min.
Pressure Reducing ValvePressure Relief Valve
There are two pressure control valves: one is a
pressure relief valve, and the other is a pressure reducing valve. Pressure
relief valves have higher flow capacities than pressure reducing valves because
pressure relief valves have to be capable of directing all flow to the tank.
Pressure relief valves are used in hydraulic
systems to limit the system pressure to a specific set level. If this set level
is reached, the pressure relief valve responds and feeds the excess flow from
the system back to the tank.
Note: the pressure relief valve is a normally
closed pressure control valve.
In contrast to pressure relief valves, which affect
the level of input pressure (i.e. pump pressure) fed into the hydraulic system,
pressure reducing valves are used to influence the output pressure of the
hydraulic system to a subsystem (e.g. actuator pressure).
Reducing the input pressure (primary pressure) or
maintaining a particular output pressure (secondary pressure) is achieved at a
set value which is below the varying pressure occurring in the main hydraulic
circuit. It is thus possible to reduce the pressure in one part of the circuit
to a lower level than the system pressure.
Note: the pressure control valve is normally open.
Flow Control Valves
Flow control valves manage the flow by decreasing
or increasing the opening at the throttling point. This helps to determine
speed of movement for the actuators. The simplest design for a flow control
valve is a needle or longitudinal slot mounted in the pipeline and connected to
a screw that adjusts the opening at the throttling point.
These are called throttle valves and they are
regularly used in combination with a check valve, i.e. the throttle check valve
for speed control in one direction of flow. A disadvantage of throttle valves
is that at varying loads a change in pressure drop will change the flow; thus,
the speed of the moving actuator will also be affected. Flow control valves are
divided into two types:
Throttle valves (flow depends on Δp)
·
Viscosity
dependent
·
Viscosity
independent
Flow control valves (independent of Δp)
·
2-way flow
control valves
·
3-way flow
control valves
The difference in pressure before and after the
throttling point, i.e. the pressure drop (Δp), determines the rate of flow
through the throttle valve at a particular setting. If the pressure drop over
the throttling point remains the same, the flow of oil that passes the
throttling point remains the same as well. This allows operation at constant
speeds, regardless of the load.
Flow control valves are used to influence the speed
of movement of actuators by changing the opening for the flow (decreasing or
increasing it) at the throttling point. In fact, these are two flow control
valves placed in series and built together. The throttling point operates at a
fixed setting, but the throttle opening before the throttling point varies with
pilot pressure of the load.
Note that flow dividers have a certain special
standing: they divide an oncoming flow into two or more flows. Usually it is
used to distribute the flow of a single pump to two or more sub-systems that
have different operating pressures.
Throttle Valve
Throttle valves come in piston and needle-valve
structures, but we also know them as turn plugs with axial or radial grooves.
The smothering of grooves is more accurate but provides more variability than
those with piston structures. The needle throttle has one disadvantage: a great
deal of power is required to move the needle only a slight amount.
The pressure difference (Δp) determines the amount
of flow that passes the throttle. In systems with varying loads (and therefore
varying pressures), the flow passing the throttle will always be different.
You can find non-adjustable (fixed) smothering in
situations where it is needed to gauge against excessive pressure surges. Also,
one can find non-adjustable throttles in control systems.
Flow Control Valve
A pressure-compensated flow control valve has a
fixed throttling flow at all pressures. The two-way pressure-compensated flow
control valve is also called a series valve. The pressure reducing valve and
the smothering of this valve are placed in series with each other. At a
three-way pressure control valve, the pressure relief valve and the throttle in
this valve are parallel to each other.
The two-way and three-way pressure compensated flow
control valves are quite similar. The only difference is that in the latter
type, the excess oil flow is not drained through the pumps safety valve but
through the flow control valve itself. The pump pressure for a three-way
pressure compensated flow control valve is always equal to the pressure exerted
by the actuator plus the spring pressure.
Note that using three-way flow control valves
increases efficiency because the system pressure will never be higher than as
required for moving the load. With two-way flow control valves, this is not the
case because the pump keeps feeding the system with oil until the preset
pressure of the pump's safety - pressure relief - valve has been reached.
Electro Hydraulic Valves
When your hydraulic application requires a very
accurate control of the flow, hydraulic valves may be equipped with advanced
control electronics. This allows the use of inductive path measuring devices
that monitor the position of the spool continuously to ensure optimum position
of the spool.
Proportional hydraulic valves are able to control
the opening to flow proportionally instead of gradually, as is the case for
most standard hydraulic valves. The simplest type of proportional hydraulic
valve is a variable throttle controlled by a manual lever, as illustrated
below:
Proportional and servo hydraulic valves are usually
classified as high-performance valves. This distinction gives an expected
indication of performance, which tends to generalise the true differences
between various types of servo and proportional hydraulic valves. Each type has
its own unique performance characteristics either in controlling pressure or
controlling flow.
Servo hydraulic valves use closed-loop control to
monitor and feed back the main-stage spool position to a pilot stage
(hydraulic/pneumatic) or driver (electronic). Proportional hydraulic valves, on
the other hand, move the main-stage spool in direct proportion to an external
piloted control signal and do not have any means of feedback within the valve.
Proportional Hydraulic ValveServo Hydraulic Valve
The main stage spool of a servo hydraulic valve is
equipped with a path measuring system for accurate adjustment. This system
measures the exact position of the main-stage spool and feeds its position
directly to the electronic control unit. If sworn position is not consistent,
the control signal corrects the position of the main-stage spool.
Servo hydraulic valves are widely used in aerospace
and industrial applications.
The most common proportional hydraulic valves are
directional control valves, pressure relief valves, flow controllers and
adjustable throttling. Proportional hydraulic valves convert an incoming
mechanical or electrical signal directly proportional to a shear mode. The
movement follows a continuously incoming signal. Different types of available
proportional hydraulic valves are:
·
Various
directional control valves
·
Flow control
valves
·
Pressure relief
valves
·
Pressure
reducing valves
·
Counter balance
valves
Typical applications of proportional hydraulic
valves include cranes and industrial applications such as injection moulding.
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