4707029 4478987 Main Relief Valve Hydraulic Safety Valve Pressure Relief Valve ZX40U-3 ZX48U-3 ZX50U-3 ZX52U-3 Excavator Parts

4707029 4478987 Main Relief Valve Hydraulic Safety Valve Pressure Relief Valve ZX40U-3 ZX48U-3 ZX50U-3 ZX52U-3 Excavator Parts

Product Description

The GVO excavator relief valve, compatible with ZX40U-3 ZX48U-3 ZX50U-3 ZX52U-3 excavators, is a key pressure control valve in the hydraulic system. It regulates hydraulic pressure, releases overload pressure, protects core hydraulic components such as the main valve and hydraulic pump, and ensures stable operation of the entire machine.

This relief valve is precision-machined from high-quality steel and undergoes overall quenching treatment. Equipped with oil-resistant and high-pressure-resistant seals, it boasts excellent sealing performance, impact resistance, and wear resistance. Suitable for the high-pressure hydraulic conditions of excavators, it effectively prevents internal leakage, pressure loss, operational instability, and vibration.

Product Introduction

This plug-in relief valve, designed for ZX40U-3, ZX48U-3, ZX50U-3, and ZX52U-3 mini excavators, is a crucial pressure control component within the distribution valve of the small excavator. It plays a central role in limiting the main circuit pressure, maintaining stable overflow pressure, and providing overload protection for the system. It directly determines the digging force of the entire machine, the crushing power of the bucket, and the output performance of each actuator.

The valve body is manufactured from high-quality alloy steel, and the valve core undergoes overall quenching and hardening treatment, significantly improving the surface wear resistance. This can effectively prevent scratches caused by fine impurities in the hydraulic oil and reduce the probability of valve core sticking and internal leakage. The valve core and valve sleeve are processed using high-precision matching grinding technology, with a micrometer-level fit gap. This ensures that the valve core responds quickly and sensitively, while also minimizing internal leakage of high-pressure oil and guaranteeing the system's pressure retention capability. The internal pressure regulating spring is made of high-toughness alloy spring steel and undergoes forming fatigue treatment. Under the frequent start-stop and repeated overflow and depressurization conditions of the mini excavator, it is less likely to experience elastic fatigue, plastic deformation, and maintains a stable pressure setting value over a long period of operation. The entire sealing assembly is made of oil-resistant and high-temperature-resistant rubber material, capable of adapting to the environmental changes of high-temperature summer operation and low-temperature winter startup of the mini excavator. It effectively prevents valve position leakage and oil seepage, and fully adapts to the complex usage conditions of urban construction sites with high dust and frequent equipment switching.

Packaging & Shipping

We use high-strength, environmentally friendly paper export packaging, which is reinforced, cushioned, and moisture-proof, suitable for long-distance international logistics transportation, and meets cross-border freight and environmental protection standards. International transportation adopts formal cross-border logistics, with full tracking of logistics information and supporting customs clearance documents to ensure smooth customs clearance and timely delivery of goods overseas.

Company Introduction

The GVO brand is a manufacturer of hydraulic components. We mainly produce the most comprehensive range of pilot pumps, gear pumps, relief valves, hydraulic pumps, electrical components, hydraulic parts, engine assemblies, traveling assemblies, rotating assemblies, distribution valves, and other components.

We are factory direct sellers without any middlemen profiting from price differences. The quality is definitely the best for you because we are the ones who produce them. We cannot tarnish our reputation. The prices are also the most favorable for you. There is a stable delivery speed.

We value every customer and provide you with the best service. We offer pre-sale, in-sale, and after-sale guarantees. Any problems will definitely be resolved for you. We are always available to serve you.