 2025 Sun Hydraulics 1 of 5

MODEL

XQCE

Accumulator sense, pump unload assembly

CAPACITY: 40 L/min.

This valve assembly is meant to charge an accumulator using a fixed displacement pump. When the pressure

reaches the set point of the valve, the pump is unloaded. When the pressure drops to the value determined by the

fixed percentage of the pilot valve, the pump is brought back on line to recharge the accumulator. The ventable

relief serves a dual purpose as a main stage to unload the pump and as a system over-pressure relief.

sunhydraulics.com/model/

XQCE

TECHNICAL DATA

Body Type Line mount

Capacity 40 L/min.

Mounting Hole Diameter 10,4 mm

Mounting Hole Depth Through

Mounting Hole Quantity 2

Model Weight 1.33 kg.

NOTES

Assembly overall dimensions and mounting hole specifications will vary based on the configuration.

3/4" Code 62 Flange Mounting Hole Data: Inch: 3/8-16 UNC x .94 (23,9 mm) DP, Metric: M10 x 1.5-6H x .94 (23,9 mm) DP; (Code 61: .88 (22,3 mm) DP)

For detailed information regarding the cartridges contained in this assembly, click on the models codes shown in the Included Components tab.

Important: Carefully consider the maximum system pressure. The pressure rating of the manifold is dependent on the manifold material, with the port

type/size a secondary consideration. Manifolds constructed of aluminum are not rated for pressures higher than 3000 psi (210 bar), regardless of the port

type/size specified.

 2025 Sun Hydraulics 2 of 5

MODEL

XQCE

Accumulator sense, pump unload assembly

CAPACITY: 40 L/min.

Continued from

(L)CONTROL

L Standard Screw Adjustment

(A)ADJUSTMENT RANGE

A 1000 - 3000 psi (70 - 210 bar), 1000 psi (70 bar)

Standard Setting

(N)SEAL MATERIAL

N Buna-N

V Viton

(B)

(K)

OPTION SELECTION EXAMPLE: XQCELANBK

PILOT RATIO (4TH LETTER) OF PRIMARY CARTRIDGE

B 20% (with QPAB primary cartridge, 20%, accumulator sense, pump unload valve - pilot capacity)

A 15% (with QPAA primary cartridge, 15%, accumulator sense, pump unload valve - pilot capacity)

C 30% (with QPAC primary cartridge, 30%, accumulator sense, pump unload valve - pilot capacity)

D 50% (with QPAD primary cartridge, 50%, accumulator sense, pump unload valve - pilot capacity)

PORT DESIGNATORS

Modifiers Ports

K, K/S Ports P, T, SYS 1, SYS 2: SAE 10; Port G: SAE 6; Port D: SAE 6;

3, 3/S Ports P & SYS 1: 3/4" Code 62; Port T: 3/4" Code 61 or Code 62 ; Port SYS 2: SAE 10; Port D: SAE 6; Port G: SAE 6;

3/M, 3/T Ports P & SYS 1: 3/4" Code 62; Port T: 3/4" Code 61 or Code 62 ; Port SYS 2: 1/2" BSPP; Port D: 3/8" BSPP; Port G: 1/4" BSPP;

C, C/S Ports P, T, SYS 1, SYS 2: 1/2" NPTF; Port G: 1/4" NPTF; Port D: 3/8" NPTF;

O, O/S Ports P, T, & SYS 1: 3/4" Code 61; Port SYS 2: SAE 10; Port D: SAE 6; Port G: SAE 6;

O/M, O/T Ports P, T, & SYS 1: 3/4" Code 61; Port SYS 2: 1/2" BSPP; Port D: 3/8" BSPP; Port G: 1/4" BSPP;

V, V/S Ports P, T, SYS 1, SYS 2: 1/2" BSPP; Port G: 1/4" BSPP; Port D: 3/8" BSPP;

MATERIAL DESIGNATOR No modifier - inch, aluminum /S - Inch, Ductile Iron /M - Metric, Aluminum /T - Metric, Ductile Iron

INCLUDED COMPONENTS

Part Description Quantity

CXDAXCN Cartridge 1

QPABLAN Cartridge - Primary 1

RVCFXAN Cartridge 1

TECHNICAL FEATURES

When applying this assembly, a separate drain line is required to prevent erratic operation caused by tank line pressure fluctuations.

NOTE: Careful consideration should be given when selecting an adjustment range. System pressure drops and flows tend to affect the operation of unloading

valves. Low operating pressures combined with low differentials result in a very narrow band between unload and reset, requiring precise system design. High flow

rates typically mean high pressure drops, which subtract from the differential the valve has to work with.

The pressure setting and the resultant reseat pressure are in reference to the port 1 area of the QPA* pilot valve. Pump pressure will be higher and accumulator

pressure will be lower due to pressure drop caused by flow.

The porting on this assembly is large in relation to its capacity. This is done to encourage the use of correspondingly large piping to minimize problems caused by

flow induced pressure drop.

The spool design of the pilot valve allows it to maintain a fixed differential ratio because the areas are created by diameters on the spool that will not wear or change

with use.

The accumulator pilot valve must be set below any reliefs in the pump side of the system or severe heating could occur.

The relief in this package is meant to be an over-pressure device. It is set higher than the highest setting of the pilot valve and capped.

MANIFOLD FACES

FACE GRID

PRIMARY CARTRIDGE CONFIGURATION