Hydraulic relief valve

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About Hydraulic relief valve

Hydraulic Relief Valves for Heavy Equipment

Find replacement hydraulic relief valves at Fab Heavy Parts for excavators, loaders, and other machinery that relies on hydraulic pressure control. This collection includes main relief valves, main control relief valves, and cartridge-style relief valves, with listings for equipment from multiple manufacturers. You can also find selected pressure relief valves for engine and air compressor applications, so review each product’s stated use before choosing a replacement. 

Replacement Relief Valves for Excavators and Loaders

Hydraulic relief valves help limit pressure in a hydraulic circuit, helping protect components from excessive pressure when the valve is designed and installed for that purpose. A worn, damaged, or incorrectly functioning valve may contribute to hydraulic performance problems, but symptoms can also have other causes. Select a replacement based on the original part number, machine model, and the specific valve location or function.

The collection includes listings for selected Caterpillar, Komatsu, Hitachi, Kobelco, Volvo, Case, Hyundai, John Deere, and Bobcat equipment. Examples include relief valves listed for the Caterpillar 320B and 320D, Komatsu PC200-7 and PC200-8, Hitachi ZX-series excavators, and selected Kobelco SK-series models. These applications are product-specific; a valve listed for one model or machine generation should not be assumed to fit another. 

Choose the Right Pressure Relief Valve

Before ordering, compare the part number on your existing valve with the number and application details shown on the product page. Check the machine make, exact model and suffix, serial number range where applicable, and whether the component is a main relief valve, a control valve, or another type of pressure relief valve. Similar-looking valves may differ in pressure setting, dimensions, port configuration, or intended circuit, so physical appearance alone is not enough to establish compatibility.

Need Help Finding the Right Hydraulic relief valve?

Can't find the replacement part you need? Send FAB Heavy Parts your part number, engine model, or equipment details. Our team can help review your requirements and provide a quotation.

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Frequently Asked Questions

How do I find the correct hydraulic relief valve for my equipment?

Start by identifying the part number on your existing relief valve or checking your equipment's parts documentation. Compare that information with our replacement hydraulic relief valve listings, including the stated equipment applications and valve references. Depending on the hydraulic system, you may also need to confirm the valve type, pressure setting, and machine configuration before selecting a replacement.

Can I replace a main relief valve with another hydraulic relief valve that looks similar?

Not necessarily. Main relief valves, swing motor relief valves, and other pressure-control valves may have different functions, specifications, and installation requirements. Similar appearance does not confirm compatibility. We recommend matching the original valve identification and checking the relevant hydraulic circuit requirements before ordering.

Do replacement hydraulic relief valves come with the correct pressure setting?

Pressure settings depend on the specific valve and application. Some relief valves may have a specified factory setting, while others may require application-specific adjustment or verification. Do not assume a replacement has the correct setting unless this is confirmed in its product information. Always follow the applicable equipment or valve manufacturer's service specifications.

What should I check before installing my replacement hydraulic relief valve?

Before installation, compare the replacement with your original valve. Check the part number, dimensions, connection or cartridge configuration, and any identification markings relevant to the application. Make sure the component matches the required hydraulic circuit. Hydraulic systems can retain dangerous pressure, so follow the equipment manufacturer's pressure-release and installation procedures before working on the system.

What if my hydraulic system still has pressure problems after replacing the relief valve?

A continuing pressure problem does not necessarily mean the replacement valve is defective. Other hydraulic components, system conditions, or an incorrect valve specification may contribute to the symptoms. Confirm the replacement valve's application and have the system inspected using the manufacturer's diagnostic procedures and appropriate pressure-testing equipment. Avoid making unverified pressure adjustments.

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