Symbol
Description
The UPCV10-F41 is a screw in, cartridge style, internally piloted, pilot unloading valve with an internal
check valve with fixed reload pressure ratio of 80% for use in accumulator type hydraulic systems
Operation
In its steady state, the UPCV10-F41 blocks flow from port 3 to port 4 and allows flow from port 1 to port
2. On attainment of a predetermined pressure at port 2 and 3, the spool shifts to allow free flow from
port 3 to port 4, unloading the port 3 pilot. If pressure at port 2 drops to a level below the ratio
established reload value, the valve will close, blocking flow from port 3 to port 4. The spring chamber is
vented to port 4
Features
Internal check valve
Optional fixed reload pressure ratios.
Hardened precision spool and cage for long life.
Choice of seal options.
Overview
Ratings
Pressure Ratings
Pressure rating
206.8 bar (3000 psi) - Note: Port 1
206.8 bar (3000 psi) - Note: Port 2
206.8 bar (3000 psi) - Note: Port 3
103.4 bar (1500 psi) - Note: Port 4
Proof pressure
482.6 bar (7000 psi)
Burst pressure
965.3 bar (14000 psi)
Pressure setting
41.4 to 206.8 bar (600 to 3000 psi)
Loading and unloading pressure ratio
Specified ratio ±5%
Flow Ratings
Flow rating
0.8 to 7.6 lpm (0.2 to 2 gpm) - Note: Port 3 to 4
1.9 lpm (0.5 gpm) - Note: Factory recommendation
45.4 lpm (12 gpm) - Note: Port 1 to 2
Temperature Ratings
Operating fluid temperature
-40 to 100 °C (-40 to 212 °F) - Note: With buna N seals
-26 to 204 °C (-15 to 400 °F) - Note: With fluorocarbon seals
-54 to 107 °C (-65 to 225 °F) - Note: With polyurethane seals
-54 to 107 °C (-65 to 225 °F) - Note: With urethane seals
Storage temperature
-40 to 70 °C (-40 to 160 °F)
Ambient temperature
-40 to 70 °C (-40 to 160 °F)
Other Ratings
Corrosion protection
960 hr salt spray per astmb117
Operating Parameters
Fluids
Mineral based or synthetic with lubricating properties
Fluid viscosity range
7.4 to 420 cSt
Maximum operating contamination level
18/16/13 per ISO 4406
UPCV10-F41
hydraforce.com
PRESSURE UNLOADING VALVE
hydraforce.com
12/15/2020
UPCV10-F41
Properties
Unit weight
0.28 kg (0.61 lb)
Internal wetted surface area
251 cm² (38.9 in²)
Performance
Dimensions
Materials
Materials
Cartridge: Weight: 0.28 kg (0.61 lbs) Steel with hardened work surfaces. Zinc-plated exposed surfaces. Buna N O-rings and polyester
elastomer back-ups standard.
Installation Specifications
Cavity
Hvc10-f4
Cartridge installation torque
44.7 to 50.2 N-m (33 to 37 ft-lb)
Orientation restriction
None
UPCV10-F41
hydraforce.com
PRESSURE UNLOADING VALVE
hydraforce.com
12/15/2020
UPCV10-F41
Accessories
Seal kit
SK10-F4N-BMM - Note: Buna N
SK10-F4V-BMM - Note: Fluorocarbon
SK10-F4P-BMM - Note: Polyurethane
SK10-F4U-BOO - Note: Urethane
Housings
Order Code
UPCV10-F41
hydraforce.com
PRESSURE UNLOADING VALVE
hydraforce.com
12/15/2020
UPCV10-F41
