YN20V00004F2 YN20V00004F3 Rotary Pump Balance Valve Anti-sway Valve SK200-8

Product Specification

YN20V00004F2 YN20V00004F3 Rotary Pump Balance Valve Anti-sway Valve SK200-8 SK200-6E SK210-8 SK350-8 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 integrated overload main relief valve is a dedicated control valve for the hydraulic systems of Kobelco’s classic "Yellow Hornet" series. It is fully compatible with a range of models, including the older SK200-6E (direct-injection engine), the SK200-8 and SK210-8 (medium-tonnage earthmoving models), and the SK350-8 (large-tonnage heavy-duty mining model). Serving as an external pressure control assembly for the main control valve, it performs four critical functions: limiting the maximum system pressure, providing instantaneous pressure relief during heavy-load pressure spikes, maintaining stable pressure under load, and dampening pressure shocks.

Designed with a focus on sealing integrity, impurity tolerance, and durability in harsh conditions, this universal relief valve addresses the common challenges of field operations—such as heavy dust, exposure to mud and water, flying debris, and hydraulic oil contamination. It features comprehensive upgrades in sealing, rust and wear resistance, and anti-jamming performance.

The oil outlet fittings at both ends of the valve body are equipped with fluororubber O-rings that are resistant to oil, temperature extremes, and aging. Precision machining of the fitting threads and sealing grooves ensures a perfect fit upon installation. These seals resist hardening, cracking, deformation, and leakage across various operating conditions—including high-intensity summer work with soaring oil temperatures, cold winter starts, and seasonal temperature fluctuations—thereby preventing oil loss and site contamination caused by leaks at the connection points.

The internal spool utilizes a precision sliding fit with micron-level tolerances, and all internal flow channels are chamfered and deburred to minimize erosion and cavitation damage to the valve body walls caused by high-pressure oil turbulence. The inlet features a built-in debris-blocking structure that prevents large metal particles, mud, and sand from directly entering the spool sealing interface. This design significantly reduces the risk of valve jamming or total pressure failure—even when routine maintenance (such as filter replacement) is delayed or hydraulic oil cleanliness is poor—making it well-suited for the realities of rough maintenance practices often found on construction sites.

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.