Pressure Control Valves

HRVD08-20 — Relief, Direct-Acting, Poppet, High Pressure Valve
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HRVD08-20 Valve

SYMBOL:
HRVD08-20 Valve symbol

DESCRIPTION
A screw-in, cartridge-style, direct-acting, poppet-type, hydraulic relief valve with dampening
intended for use as a pressure limiting device for common hydraulic circuit protection. This
valve can be used in bi-directional/cross-over relief applications.

OPERATION
The HRVD08-20 blocks flow from 1 to 2 until sufficient pressure is present at 1 to force the
poppet from its seat. The cartridge offers fast response to load changes in typical hydraulic
circuits requiring low hysteresis, low pressure rise and low internal leakage. A built-in dashpot
helps stabilize the valve and minimize poppet noise.

FEATURES
• 1000-hour-salt-spray-rated protective coating per ASTM B117 standard.
• Height of the adjuster does not change when the pressure setting is adjusted.
• All adjustment options have positive stops that prevent springs from going solid.
• Dashpot quiets poppet movement.
• Variety of spring ranges to 420 bar (6100 psi).
• Variety of adjustment options.
• Rapid response to pressure surges.
• Low leakage.
• Stable performance.
• Flat pressure rise.

RATINGS
Operating Pressure: 420.6 bar (6100 psi) at Port 1;
   Cross-over/bi-directional relief pressure: 241.3 bar (3500 psi) at Port 2.
Burst Pressure: 785.4 bar (11000 psi)
Flow Rating: Port 1 to 2: 52.9 lpm (14 gpm) at max pressure
   The Performance Chart illustrates flow handling capacity at maximum setting for each
   spring range option. Pressure rise will vary with spring (range) and with setting within range
   due to flow forces. Consult factory for specific flow characteristic values.

Flow: up to 114 lpm (30 gpm); see performance chart for flow handling capacity at max.
   setting for each spring range option. Pressure rise will vary with spring (range) and with
   setting within range due to flow forces. Consult factory for specific flow characteristic values.
Internal Leakage:.25 ml/minute (5 drops/minute) max. to 75% of nominal setting
Crack (Set) Pressure Defined: bar (psi) evident at 0.95 lpm (0.25 gpm) attained
Reseat Pressure: Nominal 85% of crack pressure; leakage to 1 ml/min (20 drops/min)
Standard Spring Ranges: Due to manufacturing tolerances, it may be possible
   to adjust the valve either lower or higher than the nominal ratings shown below.
Temperature: -40° to 100°C (-40° to 212°F) with Buna N seals;
   -26° to 204°C (-15° to 400°F) with fluorocarbon seals;
   -54° to 107°C (-65°F to 225°F) with polyurethane seals

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: Urethane seals are required for bi-directional/cross-over relief applications.
   For general installation instructions; See page 9.020.1
Cavity: VC08-2 Variation A or HVC08-2 Variation A; See page 9.108_2w
Cavity Tool: CT08-2XX. If used with HVC08-2, use cavity tool HCT08-2XX; See page 8.600.1
Seal Kit: SK08-2X-B (X = N, V, HV, P); SK08-2U-O (Urethane seals required for
   bi-directional and cross-over relief applications); See page 8.650.1

PERFORMANCE:

HRVD08-20 Flow-Pressure

  DIMENSIONS:
HRVD08-20 Valve Dimensions

MATERIALS:

Cartridge: Weight: Depending on adjustment option, cartridge weight varies from 0.19 to
0.22 kg. (0.41 to 0.48 lbs.) Steel with hardened work surfaces.Zinc-plated exposed surfaces. Anodized aluminum knobs.

Standard Ported Body: Weight: 0.63 kg.
(1.38 lbs.) ductile iron. For pressures over
206 bar (3,000 psi), use H-series ductile iron body cavity; dimensions and weight will differ.
See page 8.008_2w.

Adjustment Options:
For ‘A-Alt’ Fixed Height Adjuster details,
See page 6.003.1
  ORDERING CHART:

HRVD08-20 Ordering Chart

Selection guide - similar valves.
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