Load Control Valves
Counterbalance, Vented Counterbalance and Motion Control Valve Packages for
applications up to 350 bar (5000 psi) and 190 L/min (50 USgpm)
H
Typical Application Rated Flow
Model Pressure bar (psi)l/mim (USgpm)Page Load Control Valves - Application guidelines, features H-3 H-5 Counterbalance valves
350 (5000)..............................................60 (15)......................................................H-6 .350 (5000)..............................................114 (30)....................................................H-8 Vented counterbalance valves
<350 (5000)..............................................60 (15)....................................................350 (5000)..............................................114 (30)...................................................H-12 Motion control valves
<210 (3000)...............................................151 (40)..................................................210 (3000)...............................................190 (50)..................................................H-16 Dual motion control valve
<210 (3000)...............................................190 (50)..................................................H-18 Dual motion control valve with load lock
<210 (3000)...............................................151 (40)..................................................H-20
Note
Pilot operated check valves
are covered in Section G.
Load control valves Eaton offers a broad range of Vickers load control valving including counter-balance, motion control and pilot operated check valves. The prime function of load controls is to prevent loads from running ahead of pump supply and/or to pro-vide positive load holding. The val
ves provide pre-ci and stable motion con-trol. Load control valves are ideally suited for moving and positioning systems. The products include both screw-in cartridge and inline housing valves to meet the majority of load control requirements.
Load control
application tips
3-ported counterbalance valves
The valves are ud with an open center on/off direc-tional valve for:
•Preci control of over-running loads •Protection from pump cavitation
•Preventing actuator from running ahead of the pump supply and •Providing load holding and ho failure safety Vented (4-ported) counterbalance valves The valves are ud for:•Preci control of overrunning loads •Regenerative cylinder circuits
•Meter-out control and providing load holding and ho failure safety with proportional control valves Pilot operated check valves
The valves are ud:
•For position load locking
•As an alternative to
counterbalance valves
where neither the over-
running loads or relea
speed are factors in the
application.
•Pilot operated check
valves are covered in
ction G
Counterbalance
cartridges, 3-ported
The CBV are single car-
tridge type counterbalance
valves that have:
• A check feature allowing
free flow in one direction
• A relief feature
controlling flow in the
other direction
• A pilot signal that over-
rides the relief tting
providing the counterbal-
ance function.
The CBV*–10 ries prod-
ucts are capable of handling
flows to up 60 L/min (15
USgpm) and pressures up
to 350 bar (5000 psi).
The CBV*–12 ries prod-
ucts are capable of handling
flows up to 114 L/min (30
USgpm) and pressures up
to 350 bar (5000 psi).
The valves are available
with 4:1 and 10:1 pilot
ratios. As a general rule, a
low pilot ratio will provide
better motion control andlively是什么意思
stability in systems with
higher capacitance (spongy)
and inductance (high inertial
loads). A high pilot ratio
improves the efficiency of a
hydraulic system, but
motion control stability may
suffer.
The 3-ported counterbal-
ance valves are offered
with a wide variety of
standard housings with
SAE and BSPP portcdrom
jinmaoptions. Aluminum and
steel housings are available
in the following styles:
•Inline single
•Inline dual
•Inline dual, with integral
shuttle
•SAE 4-bolt, Code 61
•Clo coupled, nipple
mounted
•Gasket mounted single
fasd•Gasket mounted dual
•Various bolt on manifolds
for Eaton hydraulic
motors
Vented counterbalance
cartridges, 4-ported
The VCB1-10 and VCB1-12
are single cartridge type
counterbalance valves that
have:
• A check feature that
allows free flow in one
direction
• A relief feature that con-
trols flow in the other
direction and
• A pilot signal that over-
rides the relief tting,
providing the counterbal-
ance function
The additional 4th port on
this valve provides an exter-
nal drain that makes the
valve innsitive to back
pressure at port 2, whenmyfriend
the valve is piloted open.
This is particularly uful in
regenerative circuits, meter-
out circuits, rvo valves
and proportional valves cir-discuss的用法
cuits. This valve is available
with a 4:1 pilot ratio. The
4-ported counterbalance
valve is offered with a wide
variety of standard
housings with SAE and
BSPP port options.
NOTE: For applications
where the flow rate will not
exceed 37,8 L/min (10
USgpm) for VCB1–10 and
95 L/min (25 Usgpm) for
VCB1-12, the standard C-
**-4 housing can be ud.
For applications over tho
flows or tho that require
a reduced pressure drop,
housings with the slot
feature or a C-**-4U cavity
are required.
Aluminum and steel
housings are available in
covid 19英文全称怎么读the following styles:
•Inline single
•Inline dual
•Gasket mounted single
Motion control valves
The are inline housing
type motion control or
brian mcfadden
counterbalance valves that
utilize parate cartridges
to perform the counterbal-
ance function as described
in the 3-ported version. The
16 and 20 ries valves are
available in both single and
dual functions. The 16
ries is capable of
handling flows up to 151
L/min (40 USgpm) and
pressures up to 210 bar
(3000 psi). The 20 ries
valves are capable of han-
dling 190 L/min (50 USgpm)
and pressures up to 210 bar
(3000 psi). Both ries offer
a 10:1 pilot ratio.
Features and benefits
of counterbalance & motion controls:•Positive load holding in any position.
•Thermal expansion relief protection.
•Cartridge valves may be installed directly into cavi-ties machined in the actuator body. This reduces the number of potential leak points and simplifies plumbing. •Line mounting of single or dual functions can simplify installation of load control valves in many applications. •Dual function models that can introduce low-pressure makeup flow to prevent cavitation can be line mounted in hydro-static transmissions. •When ud with paired cylinders, counterbalance valves will help to bal-ance the load by transfer-ring part of the load from the heavily loaded cylin-der to the less loaded cylinder.
•When ud with an open center directional control valve, deceleration con-trol can be provided. Adjusting counter balance cartridge valve pressure tting: Counterbalance valves adjust in the opposite direc-tion of other pressure con-trol valves. Turning the adjuster counterclockwi increas the valve tting; turning the adjustment clockwi lowers the pres-sure tting, releasing the load.
1.Loon the jam nut.
2.Turn the adjusting screw clockwi to reduce the pressure tting, or coun-terclockwi to increa the pressure tting.Do not remove the spring
wire from the adjusting
screw.
3. Tighten the jam nut to
cure the desired pres-
sure tting.
NOTE CBV*–10 spring wire
must not be removed.
Removal will affect the min-
imum adjustment of the
valve.
ported by mechanical
means when rvicing or
removing the cartridge
valve.
should be ud to lock
static loads due to motor
and cylinder leakage.
vere decompression
shock. To help prevent
shock damage, a restriction
may be added between the
cylinder and the counterbal-
ance valve.
energy-saving devices.
Stability problems may be
encountered when system
operating pressure goes
below 50 bar (700 psi).
Pilot operated
check valves
The POC*-10 and POC*-12
ries of pilot-to-open check
valves complement the
CBV*-10 and CBV*-12 coun-
terbalance cartridges and
are physically interchange-
able with them. The POC’s
provide a low cost alterna-
tive to load control when
the dynamics of neither
overrunning loads nor load
relea speed are factors to
be considered in the design
of the hydraulic circuit for
the load to be controlled.
The pilot-to-open valves
positively lock a load from
port 1 to port 2 until pilot
pressure applied to port 3
is sufficient to unat the
valve. This then permits
flow from port 1 to port 2.
The load can also be
relead through means of
an optional screw type
override.
The POC*-10 covers flow
up to 60 L/min (15 USgpm).
The POC*-12 covers flow
up to 114 L/min (30
USgpm). With infinite life
qualification to a fatigue
pressure rating of 310 bar
(4500 psi), the POC
valves are suitable for u
in a broad range of load
control applications with
typical system operating
pressures up to 350 bar
(5000 psi). Tailoring of the
circuit to gain energy sav-
ings while minimizing shock
is obtained through the u
of veral standard cracking
pressure ranges from 2,0
bar (30 psi) to 7 bar (100
psi). When anti-cavitation
protection is required, the
0,30 bar (5 psi) spring
should be ud. For tho
applications where pilot
pressure may not always
be available, the valve can
be ordered with an optional
adjustable override.
Pilot-to-open valves are
suitable for a wide range of
applications including aerial
work platforms, boom
truck, machine tool and
round bailer markets.
Pilot operated check
valves are covered in
ction G.
Features and benefits
of pilot operated
check valves:
•Simple load holding
device. Low cost alterna-
tive to more complex
solutions when overrun-
ning loads are not pres-
ent and / or control of
load relea speed is not
required.
•Provides high operational
efficiency and low spring
ttings.
•Valves are offered with a
wide variety of standard
housings with SAE and
BSPP port options in the
following configurations:
– Inline single
– Inline dual
– SAE, 4-bolt
– Clo coupled, nipple
mounted
– Gasket mounted single
– Gasket mounted dual
The valves fit into
C–*–3S cavities.
•Four standard cracking
pressures permit energy
平安夜英文
savings, while tailoring
the hydraulic system
requirements to minimize
shock.
scratching•Unique dual spring
design provides high
operational efficiency and
a low pressure spring
option for effective anti-
cavitation protection.
•Unique design provides
compact package and
low pressure drops that
match or exceed current
market expectations and
provide for excellent
repeatability and stability.
•3:1 pilot ratio satisfies
simple load holding appli-
cation requirements,
while providing smooth
operation and longer
operating life.
•Optional adjustable over-
ride releas the load for
situations where pilot
pressure is not always
available.
either overrunning loads are
possible or load relea
speed is critical. Failure to
obrve the guidelines
may result in bodily injury
or damage to equipment.
3 Pilo t
CBV cartridges in housings I - Inline Mounted
3
VCB cartridges in housings
I - Inline Mounted
3
POC cartridges in housings*I - Inline Mounted
V2
V1
G - Gasket Mounted, Single
D
- Dual Line Mounted t
3 Pilo t B
- 4-Bolt Pad (Size 12 only)C1
N - Clod Coupled,
Nipple Mounted
C1
G - Gasket Mounted, Single
D
- Dual Line Mounted P - Dual Gasket Mounted
H -Dual, bolt on for H or T
motor
2K -Dual, bolt on for 2000
ries motor
M -Dual Counterbalance
Line Mounted w/Integral Shuttle
Functional Symbols
load Control Valves
F Type
S Type Pilot
Pilot
B - 4-Bolt Pad (Size 12 only)F Type
S Type N - Clo Coupled, Nipple Mounted
F Type
S Type G - Gasket Mounted, Single F Type S Type
D - Dual Line Mounted F Type S Type
P - Dual Gasket Mounted * Pilot operated check valve data sheets are included in Section G
F Type S Type
H
