GVO 377M51 Main Relief Valve Pressure Relief Valve Hydraulic Safety Valve SY335

Product Specification

GVO 377M51 Main Relief Valve Pressure Relief Valve Hydraulic Safety Valve SY335 SY365 SY385 SY485 Excavator Parts

Product Description

The GVO excavator relief valve, compatible with Hitachi 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 threaded cartridge relief valve is a universal high-pressure regulating component for multi-way main control valves in four models of Sany heavy-duty excavators with medium and large tonnage. It is compatible with mainstream models such as SY335, SY365, SY385, and SY485. It is a precision pressure-bearing and easily damaged component within the machine's hydraulic control system, controlling the upper pressure limit, overload pressure relief, and maintaining constant pressure output.

The entire valve body is forged from high-toughness alloy steel, eliminating conventional sand casting materials and avoiding inherent defects such as casting porosity, sand holes, and loose material. It can withstand continuous high-pressure impacts and equipment vibrations on the construction site. Core components such as the valve core and seat, which bear pressure and slide repeatedly, undergo dual heat treatment processes including quenching hardening and surface carburizing hardening. The surface wear-resistant hardness meets standards, resisting abrasive wear from mineral debris and metal impurities in the hydraulic oil, significantly extending the service life of the components. The valve core mating area is meticulously processed using high-precision mirror grinding equipment, precisely controlling the scientifically reasonable assembly gap between the valve core and valve sleeve. This ensures smooth and sensitive valve core opening and resetting, reducing the probability of problems such as valve core jamming, pressure regulation failure, and return jamming. The hexagonal locking nut on the outer side of the valve body is thickened and reinforced, ensuring even force distribution on the wrench during maintenance and disassembly, preventing slippage and edge damage. Multiple sealing points are equipped with fluororubber O-rings that are resistant to high pressure, high temperature, and hydraulic oil corrosion, relying on a multi-layered isolation structure to prevent dust and iron filings from entering the valve core cavity.

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.