PRESSURE CONTROLS
RVCV56-20 Relief, Direct Acting, Anti-Cavitation
DESCRIPTION
A screw-in, cartridge-style, direct-acting, poppet-type hydraulic relief valve with a
built-in reverse-flow anti-cavitation check valve. It is intended for use as a pressure
limiting and regulating device in demanding, high-pressure hydraulic circuits which
require fast response, low hysteresis, low leakage, low pressure override, and reverse
free-flow features.
OPERATION
The RVCV56-20 blocks flow from 1 to 2 until sufficient pressure is present at 1
to displace the poppet off its seat. Relief flow discharges to port 2. Reverse flow
occurs from 2 to 1 when differential pressure between 2 and 1 exceeds the
check spring value.
FEATURES
• Maximum pressure 420.6 bar (6100 psi) at port 1.
• Adjustments cannot be backed out of the valve.
• Adjustments prohibit springs from going solid.
• Hardened spool and cage for long life.
• Fast, smooth response to pressure surges.
RATINGS
Pressure Rating: 420 bar (6100 psi) at port 1; 70 bar (1000 psi) at port 2
Proof Pressure: 480 bar (7000 psi)
Burst Pressure: 965 bar (14,000 psi)
Flow Rating: Port 1 to 2: 115 lpm (30 gpm); Port 2 to 1: 175 lpm (46 gpm)
Overshoot: Less than 20% of setting
Adjustable Pressure Range, Port 1 to 2: 140 bar (2000 psi) minimum;
420 bar (6100 psi) maximum
Crack Pressure Defined: 0.95 lpm (0.25 gpm)
Maximum Reseat Pressure, Port 1 to 2: 85% of crack pressure
Leakage at Port 2: 10 drops/minute (0.53 ml/minute) at 103.4 bar (1500 psi) max.
Anti-Cavitation Crack Pressure, Port 1 to 2: 0.34 ± 0.07 bar (5 ± 1.0 psi)
Temperature: with Buna N seals: -40°C to 100°C (-40°F to 212°F);
with Fluorocarbon seals: -26°C to 204°C (-15°F to 400°F);
with Polyurethane seals: -54°C to 107°C (-65°F to 225°F)
Filtration: See page 9.010.1
Fluids: Mineral-based or synthetics with lubricating properties at viscosities of
7.4 to 420 cSt (50 to 2000 sus); See Temperature and Oil Viscosity, page 9.060.1
Installation: No restrictions; See page 9.020.1
Cavity: VC16-2; See page 9.116.1
Cavity Tool: CT16-2XX; See page 8.600.1
Seal Kit: SK16-2x-B; See page 8.650.1
ISO SYMBOL
PERFORMANCE
6.022.1
HYDRAFORCE
.com
®
2
1
345
5000
414
6000
276
4000
207
3000
138
2000
69
1000
18.9
5
75.6
20
56.7
15
37.8
10
94.5
25
FLOW lpm/gpm
PRESSURE DIFFERENTIAL bar/psi
Relief Valve Mode
Max. Pressure Drop; Cartridge and Body
32 cSt/150 sus oil at 40°C
113.4
30
Max. Setting
Min. Setting
Press. Drop
at Max. Opening
10.3
150
8.6
125
6.9
100
5.2
75
1.7
25
3.4
50
38
10
113
30
76
20
189
50
151
40
FLOW lpm/gpm
PRESSURE DIFFERENTIAL bar/psi
Check Valve Mode
Max. Pressure Drop; Cartridge and Body
32 cSt/150 sus oil at 40°C
227
60
265
70
Blue rectangles are links to other catalog pages.
Seals
N Buna N
V Fluorocarbon
P Polyurethane
DIMENSIONS
MATERIALS
Cartridge:
Weight:
Option A B C,L F,H
lb 1.27 1.33 1.36 1.24
kg 0.58 0.60 0.62 0.56
Steel with hardened work surfaces.
Zinc-plated exposed surfaces.
O-rings and polyester elastomer
back-up standard.
Ported Body: Aluminum: 0.57 kg.
(1.25 lbs.); Anodized high-strength
6061 T6 Aluminum alloy, rated to
207 bar (3000 psi). Ductile iron body
required for operation over 207 bar
(3000 psi). See page 8.016.1
TO ORDER
RVCV56-20__ - __ - __ - __ __ / __ __ __ __
RVCV56-20
6.022.2
®
HYDRAFORCE
HYDRAFORCE
.com
®
Porting
Cartridge Only 0
SAE 12 12T
SAE 12 Ductile Iron 12TD
SAE 16 16T
SAE 16 Ductile Iron 16TD
3/4 in. BSP* 6B
3/4 in. BSP* Ductile Iron 6BD
1 in. BSP* 8B
3/4 in. BSP* Ductile Iron 8BD
*BSP Body; UK Mfr. Only
Setting in bar
Specify, for example:
M210 210 bar
Setting in psi
Specify, for example:
30.0 3000 psi
Adjustment Option
1/4 in. Hex Allen Head A
1-1/2 in. Dia. Alum. Knob B
Option A w/ Cover Cap C
Factory Preset Non-Adj. F
Factory Preset
Hidden Adj. H
Option C w/
Lockwire Holes L
Pressure Range
30 137.9 to 206.8 bar
(2000 to 3000 psi)
45 213.7 to 310.3 bar
(3100 to 4500 psi)
60 317.2 to 420.6 bar
(4600 to 6100 psi)
INCH
MILLIMETRE
2
1
1
1.50
38.1
FLATS
Ductile iron
body shown.
ACROSS
0.75
19.1
FLATS
ACROSS
ACROSS
FLATS
TORQUE
147-153 ft-lbs
(199-207 Nm)
0.34
8.75
DIA.
Thru
2 Places
Optn. ‘B’
Optn. ‘A’
Optns. ‘C’, ‘L’
Optns. ‘F’, ‘H’
1.79
45.4
2.76
70.2
3.37
85.5
2.10
53.3
2
1.00
25.4
2.25
57.2
3.50
88.9
2.56
65.0
1.50
38.1
DIA.
0.25
6.4
1.33
33.7
1.00
25.4
2.00
50.8
3.25
82.6
HEX
2.77
70.3
Blue rectangles are links to other catalog pages.
