Relief Valves Across 17 Excavator Brands: XINYA Stocks the Numbers Your Shop Actually Needs

A Small Part That Stops Big Downtime

A relief valve is one of those hydraulic components that quietly keeps an excavator out of the shop. Set the pressure wrong, or let an old valve stick, and you lose breakout force, overheat the main control valve, or burn up a pump. For repair chains running mixed fleets of Hitachi, Caterpillar, Komatsu, Volvo and Hyundai machines, finding the right relief valve by part number is half the job.

That is why XINYA has expanded its relief valve inventory. We now stock main relief valves, swing relief valves, travel relief valves, unloading valves, signal valves and pump control valves — across 17 equipment brands, with both genuine and domestic replacement options on the shelf.

Brands We Cover

Our relief valve program is built around the fleets customers actually run. The current catalog spans Japanese, Korean, European and Chinese brands, plus two major hydraulic-system names.

Table 1. Equipment and hydraulic-system brands covered by the XINYA relief valve program.

Popular SKUs Currently in Stock

Below are the relief valve part numbers our customers ask for most often. Every unit ships with a matching OEM number, so buyers can cross-check against the nameplate on their old valve.

Table 2. Fast-moving relief valve SKUs. Part numbers follow OEM engraving for easy cross-reference.

Two Supply Lines, Same Part Numbers

We run the program on two supply lines, and we tell customers up front which one they are buying.

Genuine OEM relief valves come through established channels and carry the original brand engraving on the body. These are the units to specify when a fleet customer needs full traceability or when the valve goes back under a service contract.

Domestic replacement units are built in our own supporting factory to original pressure settings and port dimensions. Spools and seats go through hardened heat treatment, and every valve is tested on a bench rig before packing. Pressure setting, thread size and oil port layout match the OEM number on the label — the difference is in the price and lead time, not the fit.

This lets repair chains mix both lines in the same order: genuine valves for warranty-sensitive jobs, domestic units for the high-turnover, daily-repair side of the shop.

Pressure-Tested Before It Ships

Every relief valve leaves Guangzhou with a pressure test on record. Main relief valves are set to OEM specification — typically 320–360 bar for 20-ton class machines, higher for mining-class units. Swing and travel relief valves are calibrated separately, and the test sheet is included with bulk orders so the workshop can verify the setting on arrival.

Common valve types we ship out in this program:

• Main control relief valve— sets system pressure on the main hydraulic pump.
• Swing relief valve— protects the swing motor and swing circuit.
• Travel relief valve— protects the travel motor and final drive.
• Unloading valve / signal valve / pump control valve— matched to the machine’s hydraulic control circuit.

Who Actually Buys These

Repair chains in Russia, Southeast Asia and South America order relief valves in small repeat batches — usually 5 to 20 units at a time, mixed across brands. The most common request is what our team calls a “hyraulic rebuild pack”: one main relief valve, one swing relief valve and one travel relief valve for a given machine model, shipped together so a typical hydraulic overhaul can stay on the bench without waiting for three separate parcels.

Get a QuoteGet a Quick Quote
Working on a hydraulic rebuild and need a replacement relief valve? Just share the machine model and your current valve’s part number. Our team will cross-reference the specs, verify the pressure setting, and send over a DDP quote directly to your port.

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Delivery & Support:

• Lead Time:In-stock valves ship within 3 business days; custom or made-to-order units take 10–15 days.
• Fast Response:We reply to all inquiries within 24 hours.
• Free Identification:Send us a photo or the part number of your old valve, and we’ll immediately clarify if it’s an OEM original, a high-quality aftermarket option, or available in both.