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Hydraulic Filters

Product catalog summary

Introduction
Veljan Hydrair Limited specializes in hydraulic filters for low-pressure return line applications, offering sizes from 3/4” to 2½”. These filters are noted for their high dirt holding capacity, low pressure drop, and ease of maintenance, featuring aluminum construction for cost-effective installation and simple cartridge replacement.

Specifications
The filters operate at a maximum pressure of 145 PSI (10 bar) and a temperature range of -20°F to 250°F (-29°C to 121°C). They offer various bypass settings and element collapse ratings, with flow ratings from 70 GPM to 300 GPM depending on size.

Mounting and Porting Options
Veljan filters provide multiple mounting configurations, including inline, tank-mounted return line, and suction line filters, with porting options to suit different system requirements.

Ordering Code
The ordering code includes specifications for port size, filter type, number of elements, filter media, seals, indicator type, and bypass setting, allowing customization for specific applications.

Filter Functionality
These filters separate solid particles from oil, with a bypass valve to maintain flow during clogging. A clogging indicator provides visual feedback for timely maintenance.

Filter Elements
Available in glass fiber, cellulose, and stainless steel, Veljan filter elements offer specific micron ratings and temperature tolerances, designed for high dirt-holding capacity and long service life.

Selection Criteria
Selection should consider maximum flow, filtration capacity, pressure drop, servicing ease, and fluid compatibility, with environmental conditions affecting contamination levels.

Contamination Control
Contamination control is vital as 70-90% of hydraulic failures are due to contaminants. ISO 4406 classifies contamination levels, with common classes being 20/18/15 and 18/16/14. ISO 16889 provides a testing format for filter media efficiencies.

Filter Types and Functions

Suction Filters: Protect pumps from coarse contamination but not suitable for fine filtration due to cavitation risks.
Return Line Filters: Filter all fluid returning to the tank, preventing system contamination, often including a bypass valve.

Filter Media and Elements
Filters use surface or in-depth filtration, with surface filters using metal mesh for particles up to 25µm.

Contamination Types and Effects
Contamination can be gaseous, liquid, or solid, with solid particles being the main cause of malfunctions, categorized into soft, hard, and extremely hard particles.

Measurement and Monitoring
Contamination is measured online or offline, with solid particles measured in microns.

Sources of Contamination
Contamination can originate from new oil, manufacturing, ingress, and component wear, with new oil often containing particles.

Conclusion
Effective contamination management is essential for hydraulic system maintenance, involving cleanliness optimization and monitoring.

SAE 4059 Standard Overview
The SAE 4059 standard outlines cleanliness classes based on particle size, number, and distribution, with calibration essential for accurate measurement.

Contamination Standards and Procedures
Veljan provides guidelines for fluid sample evaluation according to ISO 4406:1999, NAS 1638, and SAE AS 4059, using microscopic and automated counting methods.

Sources and Causes of Contamination
Contamination arises from manufacturing, handling, and environmental factors, leading to various mechanical issues.

Contamination Control and Monitoring
Effective filtration reduces wear and failures, with monitoring likened to maintaining human body hygiene.

Hydraulic System Components and Analogies
Hydraulic systems are compared to the human body, emphasizing maintenance and contamination control for efficiency and longevity.

Veljan Hydrair Limited Product Overview
Veljan is a leader in hydraulics and pneumatics, offering a wide range of products with advanced manufacturing facilities and skilled workforce.

Catalog excerpts

Hydraulic Filters Size : 3/4” to 2½” FEATURES: • High dirt holding capacity • Lower pressure drop • Water removal elements • Several Mountings and porting options • Indicator shows when no element installed • Easy to service • Head and cover plate made of aluminum • Low installation cost. • Easy replacement of cartridge • Visual and Digital clogging indicator we help you see your ide

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Construction Details Inline Filter Compression Spring Filter Housing Cover Plate Maintenance Indicator Pin Inlet Connector Threaded Bush Bowl Filter Element Locating Block Bush Threaded Plug

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Veljan Hydraulic Filters 4. 3/4” Return line filter 5. 1¼” Return line filter 6. 2” Return line filter 7. 2½” Return line filter 8. Filter Parts & Functions 9. Contamination Management & Technical data Veljan Hydrair Limited Hydraulic Filter Division Balanagar, Hy

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Veljan Hydraulic Filters Introducing Low Pressure Return Line Filters : Specifications Port Size Flow Rating Temp. Range Bypass Setting : Cover Plate Element Collapse Rating Features : • High dirt holding capacity • Low pressure drop • Water removal elements • Several mounting and porting options • Indicator shows when no element installed • Easy to service • Head and Cover plate made of aluminum • Low installation cost. • Easy replacement of cartridge (Element) • Visual clogging indicator Veljan Hydrair Limited Hydraulic

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Veljan Hydraulic Filters Mountings / Porting Configuration : Inline Mounting Filter Tank Mounted Return Line Filters Tank Mounted Suction Line Filters Mountings /porting Schemes : Inline Filter Return Line Filter Suction Line Filter Veljan Hydrair Limited Hydraulic Filter Division Balanagar, Hyderabad

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Veljan Hydraulic Filters Ordering Code VHF Veljan Hydraulic Filters Product LPF - Low Pressure Filter PS - Port Size (*For only RLF filter) * Psa - 3/4” Psb - 1¼" &1" Psc - 2" & 1½” Psd - 2½ " ILF-In-Line filter RLF-Side-Inlet, Bottom - Outlet SLF-Bottom-Inlet, Side - Outlet No. of Elements 1. Single element 2. Double element Element code(Filter Media) 25C --------- 25 Microns - Cellulose Filter paper 3GF --------- 3 Microns - Glass Fiber 10GF --------- 10 Microns - Glass Fiber 15GF --------- 15 Microns - Glass Fiber SS --------- Stainless steel Seals S1 Nitrile Buna Rubber S4 Viton Indicator...

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Veljan Hydraulic Filters 3/4” Return Line Filter Specifications : Port size Flow Rating Temp. Range Bypass Setting : Cover Plate Veljan Hydrair Limited Hydraulic Filter Division Balanagar, Hydera

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Veljan Hydraulic Filters 1” & 1¼” Return Line Filter Specifications : Port size Flow Rating Temp. Range Bypass Setting : Cracking Cover Plate Element Collapse Rating Veljan Hydrair Limited Hydraulic Filter Division Balanagar

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Veljan Hydraulic Filters 1” & 1¼” Return Line Filter Return line Filter - 1¼" : Suction line Filter - 1¼" : Veljan Hydrair Limited Hydraulic Filter Division Balanagar,

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Veljan Hydraulic Filters 1” & 1¼” Return Line Filter Return Filter With Double Element - 1¼" : Note- Element length is common for Inline Line and Suction Line Filter Veljan Hydrair Limited Hydraulic Filter Division Balanagar, Hyde

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Veljan Hydraulic Filters 1½ ” & 2” Return Line Filter Specifications : Port size Flow Rating Temp. Range Bypass Setting : Cover Plate Element Burst Rating Veljan Hydrair Limited Hydraulic Filter Division Balanagar

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Veljan Hydraulic Filters 1½ ” & 2” Return Line Filter Inline Filter with Single Element- 2": Ø114.3 Return Line Filter With Single Element -2" : Ø114.3 Suction line filter With Single Element - 2" : Veljan Hydrair Limited Hydraulic Filter Division Balanagar, Hyde

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Veljan Hydraulic Filters 1½ ” & 2” Return Line Filter Inline Filter With Double Element - 2" : Note - Element length is common for Return Line and Suction Line Filter Veljan Hydrair Limited Hydraulic Filter Division Balanagar, Hyder

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Veljan Hydraulic Filters 2½ ” Return Line Filter Specifications : Port size Flow Rating Temp. Range Bypass Setting : Cover Plate Element Collapse Rating Veljan Hydrair Limited Hydraulic Filter Division Balanagar, Hy

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Veljan Hydraulic Filters 2½ ” Return Line Filter Inline Filter with Single Element- 2½" : Return Line Filter With Single Element -2½": Suction line filter With Single Element - 2½" : Veljan Hydrair Limited Hydraulic Filter Division Balanagar, Hyd

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Veljan Hydraulic Filters 2½ ” Return Line Filter Suction line Filter with Double Element- 2½" : Veljan Hydrair Limited Hydraulic Filter Division Balanagar, Hyderab

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Veljan Hydraulic Filters Filtration : The Process by which the solid particles are separated from a fluid by passing through permeable material that will not allow the solid particles to pass through. Inline Filter Function : The contaminated oil enters the filter element through the inlet port and the inlet connector in the head. After the oil is filtered it is collected in the bowl and is delivered (flows) through the outlet port . However when the filter element gets clogged the filter element fail to filter oil anymore. This raises the pressure inside the inlet connector once this pressure...

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Veljan Hydraulic Filters Returnline Filter Function : The Contaminated oil enters the filter element through the inlet port and the inlet connector in the head. After the oil is filtered it is collected in the bowl and is delivered (flows) into the tank through the check valve while the oil pressure pushes the spring in the spring retainer to get compressed to open the check valve into the tank. However when the filter element gets clogged the filter element fail to filter oil anymore. This raises the pressure inside the inlet connector and once this pressure exceeds the set valve the bypass...

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