708-2L-04531 708-2L-04532 Hydraulic Pump PC Valve Pressure Relief Valve PC200-6

Product Specification

708-2L-04531 708-2L-04532 Hydraulic Pump PC Valve Pressure Relief Valve PC200-6 PC220-6 PC230-6 PC250LC-6 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 GVO multi-stage cartridge relief valve is a core pressure protection assembly in the hydraulic system of Komatsu's classic 6th generation 20-ton excavators. It is fully and precisely compatible with the PC200-6, PC220-6, PC230-6, and the extended chassis heavy-duty model PC250LC-6. It can function as the main control distribution valve and main relief valve to stabilize the reference pressure of the entire vehicle's hydraulic system, and also as a swing overload relief valve to buffer the instantaneous high-pressure impact during steering. It is a highly essential hydraulic wear part for the maintenance and replacement of the large number of older 6th generation Komatsu excavators.

The valve body undergoes tempering and quenching to enhance structural toughness. The entire valve stem's outer circumference is subjected to multiple high-precision centerless grinding and polishing processes, resulting in an excellent mirror-like surface finish. This effectively resists long-term scratches from iron filings and sand particles in the hydraulic oil, preventing internal pressure leakage and potential oil spillage caused by scoring of the valve body's inner wall.

The multi-stage segmented valve core and seat sealing pair employs a dual precision machining process: deep-hole high-precision honing and ultra-mirror-finish grinding. The clearance is controlled to an extremely small range within micrometers, maximizing pressure sensing sensitivity and achieving millisecond-level instantaneous triggering for opening and closing.

When the instantaneous load pressure of the hydraulic system exceeds the rated safety threshold of the equipment, the valve core can open rapidly to overflow and relieve pressure. The pressure drops instantly and accurately returns to the seat to seal and lock, thus fundamentally and thoroughly solving a series of typical and difficult faults of Komatsu 6th generation machines caused by the aging and failure of the overflow valve. These include common problems that have long plagued machine owners, such as weak digging force, slow boom drop due to its own weight, sluggish and slow boom retraction, reduced bucket digging pressure under heavy load, shaking and tail swing during swing, decreased travel power under heavy load, stalling and speed drop, and abnormal rise in hydraulic oil temperature.

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.