Dual P.O. Check Valve Cartridge, SAE 08 / NG 5
Q
max
= 5 gpm (19 l/min),p
max
= 3600psi (250 bar)
Pilot operated
Series PDCV-08…
1/4
Reference: 520-P-011510-EN-02
Issue: 08.2021
S A low friction pilot piston is standard
S Compact construction for cavity types:
C0840 and AN/C0840 – 3/4-16 UNF
S Separate springs assure fast return to neutral position
S Reliable and high positive re-seat duration
S All exposed parts with zinc-nickel plating
S Can be fitted in a line-mounting body
S Replaces POCD-08…
1 Description
The PDCV08… series dual pilot operated check valve
cartridges are size SAE 08 / NG 5, high performance
screwin valves with a 3/416 UNF mounting thread. This
unit is a cartridge type, high strength steel guided poppet for
realizable low leakage performance, dual hydraulic pilot
operated check valve, for use as a blocking or load holding
device at high pressure applications.This valve allows free
flow from port 2 to port 1 and from port 3 to port 4 and it
blocks flow from port 1 to port 2 and from port 4 to port 3.
Fl
ow is allowed from port 1 to port 2 when pilot pressure is
sensed at port 3 or flow is allowed from port 4 to port 3 when
pilot pressure is sensed at port 2. In order to pilot the valve
open, the pressure at port 2 (or port 3) needs to exceed
one third of the load pressure from port 4 (or port 1). All ex
ternal parts of the cartridge are zinc-nickel plated according
to DIN EN ISO 19 598 and are thus suitable for use in the
harshest operating environments. For self-assembly,
please refer to the section related data sheets.
2 Symbol
2
1
4
3
2
1
3
4
PDCV-08-…-C… PDCV-08-…-3…
3 Technical data
General characteristics Description, value, unit
Designation dual p.o. check valve cartridges
Design pilot operated
Mounting method screw-in cartridge 3/4-16 UNF-2A
Size SAE 08 / NG 5 for cavity type C0840 and AN/C0840
Weight 0.26 lbs (0.12 kg)
Mounting attitude unrestricted
Ambient temperature range -40°F…+250°F (-40°C…+120°C)
Optional internal thermal relief valve from port 4 to port 3
3000 psi (210 bar), not adjustable
520-P-011510-EN-02/08.2021
Series PDCV-08…
2/4
Hydraulic characteristics Description, value, unit
Maximum operating pressure 3600 psi (250bar)
Maximum flow rate 5 gpm (19l/min)
Geometrical differential area ratio 3.0 to 1
Leakage flow rate 5 drops/min @ 3500 psi (5 drops/min @ 240 bar)
Flow direction see symbol
Hydraulic fluid HL and HLP mineral oil to DIN 51 524;
for other fluids, please contact BUCHER
Hydraulic fluid temperature range -40°F…+250°F (-40°C…+120°C)
Viscosity range 15…380mm
2
/s (cSt), recommended 20...130mm
2
/s (cSt)
Minimum fluid cleanliness
Cleanliness class to ISO 4406:1999
class 18/16/13
4 Performance graphs
measured with oil viscosity 33mm
2
/s (cSt)
Δp = f (Q) Pressure drop - Flow rate characteristic
“free flow 2 → 1“
EL_P0022.ai
(0)0
50
100
150
200
250
Q [gpm (l/min)]
543210
(0)
p [psi (bar)]
(3.5)
(6.9)
(10.3)
(13.8)
(17.2)
(19)(15)(11.4)(7.8)(3.8)
Δp = f (Q) Pressure drop - Flow rate characteristic
“free flow 3 → 4“
EL_P0023.ai
(0)0
50
100
150
200
250
Q [gpm (l/min)]
543210
(0)
p [psi (bar)]
(3.5)
(6.9)
(10.3)
(13.7)
(17.2)
(19)(15)(11.4)(7.8)(3.8)
Attention:
When flow passes through the check valve and
there is a large pressure difference, the poppet in
the main stage can be damaged.
Q = f (Δp; I) Flow rate adjustment characteristic
“pilot 3 flow 1 → 2“
EL_P0024.ai
(0)0
50
100
150
200
250
Q [gpm (l/min)]
543210
(0)
p [psi (bar)]
(3.5)
(6.9)
(10.3)
(13.7)
(17.2)
(19)(15)(11.4)(7.8)(3.8)
Q = f (I; Δp) Flow rate adjustment characteristic
“pilot 2 flow 4 → 3“
EL_P0025.ai
(0)0
50
100
150
200
250
Q [gpm (l/min)]
543210
(0)
p [psi (bar)]
(3.5)
(6.9)
(10.3)
(13.7)
(17.2)
(19)(15)(11.4)(7.8)(3.8)
520-P-011510-EN-02/08.2021
Series PDCV-08…
3/4
5 Dimensions & sectional view
Dimensions in inches (millimeters)
1.00 HEX
3.00
[76.2]
2.15
[54.6]
.85
[21.6]
3
4
2
2
1
1
3
6
5
7
M
A
=
2)
2
3
4
[25.4]
1
3/4−16 UNF−2A
Tightening torque M
A
2)
±10%
Cavity type C0840, AN/C0840
When fitted in steel
When fitted in aluminium
37 ft-lbs (50[Nm])
27 ft-lbs (37[Nm])
6 Installation information
Important:
When fitting the cartridges, use the specified
tightening torque. No adjustments are necessary,
since the cartriges are set in the factory.
ATTENTION!
Only qualified personnel with mechanical skills
may carry out any maintenance work. Generally,
the only work that should ever be undertaken is to
check, and possibly replace, the seals. When
changing seals, oil or grease the new seals tho
roughly before fitting them.
Seal kit NBR no. SKN-0842
1)
Item Qty. Description
4 1 O-ring no.908 ∅0.644x0.087 N90 Inch
6 2 O-ring ∅13.00x1.50 FKM mm
5 2 O-ring ∅11.00x1.50 FKM mm
7 2 O-ring ∅ 9.50x1.50 FKM mm
2 2 Backup ring ∅13.00x1.50x1.00 FI0751 mm
1 2 Backup ring ∅11.30x1.50x1.00 FI0751 mm
3 2 Backup ring ∅ 9.50x1.50x1.00 FI0751 mm
IMPORTANT!
1)
Seal kit with FKM (Viton) seals, no. SKV-0842
520-P-011510-EN-02/08.2021
Series PDCV-08…
4/4
7 Ordering code
PDCV = pilot operated dual check valve
08 = size SAE 08 / NG 5
N = NBR (Nitrile) seals (standard)
V = FKM (Viton) seals
(special seals - please consult BUCHER)
C = no thermal relief
3 = 3000 psi (210 bar) internal thermal relief from port 4 to port 3, not adjustable
0 = cartridge only
02BA = line-mounting body G1/4 BSPP aluminum
02BS = line-mounting body G1/4 BSPP steel
06TA = line-mounting body SAE-#6 aluminum
06TS = line-mounting body SAE-#6 steel
08
-
N
--
PDCV C
-
O
8 Related data sheets
Reference (Old no.) Description
520-P-000050 Form tools
520-P-000410 Cavity type C0840
… Cavity type AN/C0840
520-P-000411 Line-mounting body, 08 Series – 4-way
E 2021 by Bucher Hydraulics, Inc., 2545 Northwest Parkway, Elgin, Illinois 60124, USA
www.bucherhydraulics.com/commoncavit
y
info.el@bucherhydraulics.com
All rights reserved.
Data is provided for the purpose of product description only, and must not be construed as warranted characteristics in the legal sense. The
information does not relieve users from the duty of conducting their own evaluations and tests. Because the products are subject to continual
improvement, we reserve the right to amend the product specifications contained in this catalogue.
Classification: 430.315.345.305.305