Hydraulic Double Tube Change over Pressure Filter for Hydraulic System

Product Overview

The hydraulic dual-pipe switching pressure filter is a high-end filtration solution specifically designed for industrial hydraulic systems that have extremely demanding requirements for system reliability and continuity. It adopts a unique dual-pipe redundancy design, allowing for the safe and rapid switching of the oil path and replacement of the filter element without the need for system shutdown or pressure relief. This completely eliminates production losses and risks caused by unplanned downtime, and is a core component for protecting critical hydraulic equipment and achieving predictive maintenance.

Working principle: Dual redundancy, seamless switching

This system consists of two parallel independent filtration pipelines, an integrated reversing valve, and a common inlet and outlet. One pipeline operates as the main filter, while the other is in standby mode. When the filter element of the main filter reaches the clogging limit and needs to be replaced, the reversing valve can be operated via an external handle or control signal. The hydraulic oil flow can be instantly (at the millisecond level) switched to the standby pipeline. At this time, the main pipeline pressure returns to zero, allowing for immediate replacement of the filter element. After the replacement is completed, this pipeline returns to the standby state and waits for the next cycle. Throughout the process, the system pressure remains stable, and the equipment operation is not affected in any way.

Core advantages and value

• 100% production continuity guarantee: Achieve true online maintenance, eliminate unplanned downtime caused by filter maintenance, and maximize equipment utilization (OEE).

• Dual safety protection mechanism:

• Single-path safety: Each filter element is equipped with a bypass valve to prevent sudden blockage that could cause system overpressure or pump suction failure.

• System redundancy: The dual-pipe design provides global backup. Even if one pipe fails, it can immediately switch to the clean standby pipe, ensuring a safety level far exceeding that of a single-tube filter for the system.

• Minimal maintenance, cost reduction: The filter replacement process is simple and quick, requiring no specialized tools. Ordinary maintenance personnel can complete it within a few minutes. This significantly reduces maintenance time, complexity, and the resulting indirect costs.

• Outstanding filtration performance: Adopting a high-pressure tolerance design, it can be equipped with high-precision filter materials (such as 3μm, 5μm, 10μm Betaₓ ≥ 1000), effectively capturing the tiniest wear particles, providing top-level protection for servo valves, proportional valves and oil pumps, and significantly extending the lifespan of the oil and core components.

• High reliability design: Utilizing an integral block structure or a high-strength parallel pipeline configuration, there are few leakage points, the structure is compact, and it can operate stably for a long time under harsh conditions and high-pressure impacts.

Typical application industries

• Continuous process industries: steel casting and rolling lines, chemical production lines, paper machines, power plants (turbine control).

• High-end manufacturing and precision machinery: Large injection molding machines, CNC machine tools, die-casting machines, hydraulic press machines.

• Heavy mobile equipment: Mining machinery (excavators, hydraulic shovels), ship steering gear systems, large test benches.

• Any critical hydraulic power system that cannot withstand an unexpected shutdown.

Technical Specifications (Customizable)

• Working Pressure: Up to 40 MPa (5800 psi) or higher

• Flow range: 10 to 1000 L/min or greater

• Filtration accuracy: 1, 3, 5, 10, 20 μm (nominal accuracy, β value ≥ 200)

• Connection method: Flange (ANSI, DIN, JIS, GB), SAE, threaded interface

• Communication device: Visual mechanical pop-up indicator, differential pressure electrical switch (dry contact)

• Shell material: Carbon steel, Stainless steel

•  Ambient temperature: -20°C to +80°C

Why choose our dual-tube switching filter?

Not only do we offer standard products, but we also focus on providing customized fluid cleaning solutions for our customers. Our engineering team can design and match the optimal filter configuration for you based on your specific system pressure, flow rate, medium, installation space and cleanliness targets. We also provide full-cycle technical support from installation guidance to maintenance training.

Obtain the exclusive solution

Your hydraulic system deserves the most reliable protection. Contact us immediately to get free technical consultation and product selection advice.

Do you need to customize a non-stop filtration solution for your specific equipment? Please contact our expert team for an assessment.

FAQ

Q1: How is the dual-pipe switching achieved for "maintenance without downtime"?

A1: This system consists of two independent filtration pipelines, a reversing valve, and a common outlet. During normal operation, one pipeline is responsible for the filtration task while the other serves as a backup. When it is necessary to replace the filter element on the working pipeline, simply operate the reversing valve to instantly switch the oil path to the backup pipeline. Throughout this process, the system pressure remains stable, and the main oil path does not need to be closed, thus achieving true online maintenance and filter element replacement, ensuring the continuity of production.

Q2: Why is "dual security protection" necessary? What does it specifically refer to?

A2: Dual protection is designed to address two different failure modes:

Filter element level protection (single-path safety): Each filter element is equipped with a bypass valve. If a single filter element accidentally gets clogged and causes an excessively high pressure difference, its bypass valve will temporarily open to ensure that the oil flow in this path does not stop, preventing the pump from suctioning out or the pipeline from being damaged. However, the filtering function will be temporarily disabled at this time.

System-level protection (global safety): When a filter element gets clogged (the bypass valve is open), you have sufficient time to switch to another set of clean backup pipelines without shutting down the system, restoring full filtration. This prevents the entire system from being contaminated due to prolonged operation in bypass mode, providing a higher level of safety redundancy for the equipment.

Q3: Are the steps for replacing the filter element complicated? Do they require specialized tools or necessitate a shutdown?

A3: The procedure is very simple and does not require any professional tools or system downtime. The basic process is as follows: 1) Operate the directional valve to switch the flow to the standby pipeline; 2) At this point, the pressure in the original working pipeline returns to zero, and the filter housing can be directly opened to replace the dirty filter element; 3) After replacing the new filter element, this pipeline will return to the standby state. The entire process usually takes only a few minutes and can be completed by an ordinary maintenance personnel.

Q4: How to select the appropriate filtration accuracy? Is higher precision always better?

A4: Not necessarily. The filtration accuracy needs to be selected based on the tolerance of the most precise component in the system (such as the clearance of the servo valve) and the target cleanliness level (such as ISO 4406). If the precision is too high (such as 1μm), it may cause the filter element to get clogged prematurely, increasing the replacement frequency and pressure loss; if the precision is too low, it will not provide sufficient protection. For conventional high-pressure systems, 3μm, 5μm or 10μm are recommended. Our engineers can assist you in making an accurate selection based on the equipment model and operating conditions.

Q5: For which devices or industries is this filter mainly applicable?

A5: It is particularly suitable for scenarios where any unplanned downtime is unacceptable and high reliability is required. Typical applications include:

Continuous production industrial equipment: such as steel continuous casting, chemical production lines, and hydraulic systems in power plants.

High-end precision machinery: such as the main hydraulic systems of injection molding machines and machine tools, protecting expensive servo valves and proportional valves.

Key power systems: Ship steering gear, large test bench, core hydraulic station of mining machinery.

Q6: Is it possible to customize different interfaces, pressure ratings or materials?

A6: Absolutely. We offer customized services. You can specify as per your requirements:

Interface form: Flange (Chinese standard, American standard, European standard), SAE, thread, etc.

Pressure level: ranging from the conventional 25 MPa to higher levels of 40 MPa or above.

Shell material: Carbon steel, stainless steel, etc., to meet different oil requirements or environmental conditions. Please provide your specific parameters and we will match the design for you.