352-7116 relief valve assembly for CAT engine spare part

352-7116 relief valve assembly for CAT engine spare part Featured Image
  • 352-7116 relief valve assembly for CAT engine spare part

Short Description:

Main hydraulic relief valve assembly for Caterpillar excavator, different from auxiliary relief valve 352-7122, controls system peak pressure and releases excess pressure to protect main pump, control valve and cylinders, overhaul replacement for 320D/323D/336D excavators.

Product Detail

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description

This is a cartridge main relief valve installed inside main control valve. It integrates spool, spring and seat to set system pressure limit. When pressure spikes due to stuck load or operation shock, the valve opens to discharge oil and protect pump and cylinders. It differs from 352-7122 which serves as overload makeup valve, they cannot be swapped.

The valve body is alloy steel with lapped sealing surface. The spring is stress-relieved for cyclic hydraulic shock resistance. Internal damping orifice cushions spool movement, suppresses pressure oscillation and noise, and keeps stable set pressure.

It fits Caterpillar 320D, 320D2 GC, 323D, 326GC, 329D, 330D, 336D, 340 excavators. Valve assembly only, manifold and gaskets sold separately. Confirm calibrated pressure before ordering, different pressure ratings use different part numbers.

Part Number: 352-7116
Name: Main relief valve assembly
Applicable Models: Caterpillar 320D, 323D, 326GC, 329D, 330D, 336D, 340 excavator
Male Thread Size: 1-1/16-12
Total Length: 140.4 mm (5.52 in)
Material: Alloy steel body, hardened valve seat, alloy spring
Type: New cartridge valve assembly
Function: Limit maximum hydraulic pressure, release excess pressure and protect hydraulic pump, control valve and cylinders

Product Advantages

1. Precisely lapped valve seat for reliable sealing and low pressure drop at static condition
2. Damping buffer design for smooth opening/closing, reduces hydraulic shock and protects pump and fittings
3. Stabilized spring after aging treatment, small pressure drift under continuous heavy load
4. Standard cartridge size for easy service, replace only relief cartridge instead of whole control valve

FAQ 

Q: What faults will happen when spool wears out?
A: Low system pressure, weak operation, pressure drop during combined movement, continuous relief noise and higher fuel consumption.

Q: Can 352-7116 directly replace 352-7122?
A: No. They have different setting pressure and function. 352-7122 is overload relief valve, swap will cause abnormal pressure protection.

Q: What risk if pressure is set too high?
A: Exceed component pressure rating, risk of hose burst, seal failure and premature pump/cylinder damage.

Q: What risk if I reuse dirty hydraulic oil with new valve?
A: Metal particles keep eroding sealing seat, the new relief valve will leak internally again quickly.

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