8300 Series Return Line Filter Housing Assembly 1135L/min 28bar Duplex Hydraulic Filter For Steel Mill And Marine Hydraulics

Product Overview

hydraulic equipment projects that need high-flow return filtration are usually constrained by the housing, not the element, and the 8300 series return line filter assembly is built for that position. It is an equivalent to the PALL 8300/04/10/14 series: flows to 300 gpm (1135 L/min), working pressure to 400 psi (28 bar), port sizes 1-1/2", 2" and 2-1/2". With a dual manifold the assembly covers flows to 600 gpm (2270 L/min) through a 3" port, which allows a single installation to serve two return branches with continuous filtration during element change.

Basic Technical Parameters

Series	8300 / 04 / 10 / 14 equivalent
Maximum flow	300 gpm (1135 L/min)
Maximum pressure	400 psi (28 bar)
Port sizes	1-1/2", 2", 2-1/2"
Duplex manifold flow	600 gpm (2270 L/min)
Duplex manifold port	3"
Element interface	8300 series elements, micron grade selected at order
Application	High-flow return line filtration, steel mill and marine hydraulic systems

Steel Mill And Marine Application Scenario

On a rolling mill, the return line from the mill stand carries the full system flow plus the surge released when a cylinder retracts, so the housing must accept a high flow at moderate pressure without adding a restriction that shows up as heat. The duplex hydraulic filter housing is used here in its dual-manifold form: one chamber filters while the other is isolated for element change, and a changeover valve moves the flow without stopping the mill. The same arrangement suits marine hydraulic systems, where the return flow is continuous and maintenance windows are set by port schedules rather than by convenience. Port selection follows the pipe size rather than being adapted down, which avoids the velocity penalty that a reducer introduces on a 2-1/2" return main.

Product Advantages

High-flow internal geometry keeps pressure drop low at rated flow, so the housing does not become the system's heat source. The duplex manifold allows element change without interrupting filtration, which is the specific reason this configuration is chosen on continuous processes. Port sizes up to 2-1/2", and a 3" duplex port, match standard return pipework without reducers. The housing is built for 400 psi working pressure with a robust cover sealing arrangement, and the element interface is common across the 8300 family so consumable stocking stays simple.

Manufacturer & Factory Strength

Xinxiang Lifeierte Filter Corp., Ltd (Stock Code: 837936) manufactures high-flow filter housings and the elements that fit them as one programme, so the dimensional relationship between housing and cartridge is controlled at both ends. Housings are pressure-tested before dispatch, and the matching replacement filter element is verified to ISO 2941 collapse and ISO 2942 integrity. For projects where a mobile service unit is also required during commissioning, an oil filter machine can be supplied on the same order.

FAQ

Q1: Does this housing accept the original PALL 8300 series elements?
A1: The element interface follows the 8300 family. Confirm the specific element part numbers with our engineering team before ordering, since sub-series differ in length.

Q2: What does duplex configuration actually add?
A2: Two filter chambers with a changeover valve, so one chamber can be opened for element change while the other keeps filtering — no process interruption.

Q3: Is 400 psi the working pressure or the burst pressure?
A3: 400 psi (28 bar) is the stated working pressure for the series. Burst verification follows the ISO 2941 procedure at element level.

Q4: Can the housing be supplied with a 3" single port instead of a duplex manifold?
A4: Port configuration is selected at order; the 3" connection is associated with the dual-manifold arrangement in this series.

Q5: Which micron grade should be specified for a mill return line?
A5: It depends on the cleanliness target downstream; the grade is chosen with the element, and we will quote the matching element at the same time.

Related Products: oil filter machine | contact our engineering team

Reference: ISO 2941 Hydraulic fluid power — Filter elements — Verification of collapse/burst resistance