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MODEL

HVCA8

Ventable, pilot operated, balanced piston relief main stage with integral T-8A

control cavity - before check

SERIES 1 / CAPACITY: 40 L/min. / CAVITY: T-21A

NOTE: DATA MAY VARY BY CONFIGURATION. SEE CONFIGURATION SECTION.

The relief-before-check cartridge is a CavitySaver™ (multi-function) valve incorporating a normally closed,

balanced piston modulating element tee'd in before a check function. The valve incorporates an integral pilot control

cavity. The pilot control cavity will accept any T-8A pressure control cartridge. When the pressure at the inlet (port 2)

reaches the pilot control valve setting, the modulating element starts to open to tank (port 3), throttling flow to

regulate the pressure. The T-8A pilot section is drained to port 4. The check valve flow is from the inlet (port 2) to

the system port (port1).

TECHNICAL DATA

Cavity T-21A

Series 1

Capacity 40 L/min.

Factory Pressure Settings Established at 15 L/min.

Maximum Operating Pressure 350 bar

Response Time - Typical 10 ms

Maximum Valve Leakage at 110 SUS (24 cSt) 30 cc/min.@70 bar

Check Cracking Pressure 1,7 bar

Pilot Control Cavity T-8A

Pilot Control Valve Installation Torque 27 - 33 Nm

Valve Hex Size 22,2 mm

Valve Installation Torque 41 - 47 Nm

Seal kit - Cartridge Buna: 990021007

Seal kit - Cartridge EPDM: 990021014

Seal kit - Cartridge Polyurethane: 990021002

Seal kit - Cartridge Viton: 990021006

Model Weight 0.14 kg.

snhy.com/

HVCA8

Compound cartridge (pilot and main stage) assembly information is provided for reference only. Cartridges must be ordered separately and assembled at

point of use.

NOTES

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(D)BIAS PRESSURE

D 75 psi (5 bar)

(N)SEAL MATERIAL

N Buna-N

E EPDM

V Viton

TECHNICAL FEATURES

Note! This valve deviates from Sun's normal flow path for relief valves. It is probably not useable in current Sun relief manifolds.

Cartridges configured with EPDM seals are for use in systems with phosphate ester fluids. Exposure to petroleum based fluids, greases and lubricants will damage

the seals.

The main stage orifice is protected against contamination.

The check portion of the valve has a maximum leakage rate of less than 1 drop/minute (0,07 cc/min).

One purpose of this dual function cartridge is to offer pump isolation and relief protection in single and/or multiple pump circuits. Another purpose is to act as a main

stage in an accumulator sense, pump unload circuit.

NOTE: With the -8 control option, the main stage valve should first be installed to the correct torque value. The T-8A pilot control valve should then be installed into

the main stage valve to its required torque value.

The -8 control option allows the pilot control valve to be incorporated directly into the end of the relief cartridge via the T-8A cavity. These pilot control cartridges are

sold separately and include electro-proportional, solenoid, air pilot, and hydraulic pilot operation. See Pilot Control Cartridges.

Incorporates the Sun floating style construction to minimize the possibility of internal parts binding due to excessive installation torque and/or cavity/cartridge

machining variations.

PERFORMANCE CURVES

RELATED MODELS

HVCA Ventable, pilot operated, balanced piston relief valve - before check

Model Code Example: HVCA8DNCONFIGURATION OPTIONS