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Upload up to 300 products as an Excel or CSV file and add them to the shopping basket with one click. Your desired delivery date will be taken into account.
Orders & Deliveries
View details on orders, shipping status, methods, tracking numbers, and invoices via bulk upload - and even edit individual items there. Available for companies with a customer number and linked account.
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Request products currently unavailable and even inquire about individual pricing using this method. Attach additional information, like technical drawings, or provide your order number for seamless processing.

Diffusers Type SRV

Diffusers for installation in hydraulic tanks for direct connection to the return line using female thread BSP or NPT. Calms the return-flow oil and reduces foaming and tank noise using two concentric steel tubes with offset discharge openings. Installation completely below the minimum liquid level with the closed surface facing towards the pump intake side. Upper end cap made of aluminium, other components made of steel, galvanised.
STAUFF Hydraulic Accessories
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STAUFF Hydraulic Accessories
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SPBN-2-B0.35-10-N12-A-493019
Plastic Filler Breather Compac Threaded Cap Diameter 70mm Pressurised at 0.35 Bar / 5 PS w/ Air Filter Element Foam Mic Connection: 3/4 NPT Male w/ Anti-Splash Feature
Price only available on request
Item Designation
STAUFF Item No.
SPBN-2-B0.35-10-N12-A-493019
6100190599
Item Designation
STAUFF Item No.
SPBN-2-B0.35-10-N12-A-493019
6100190599
SPBN-2-O-10-S080-A
Plastic Filler Breather Compac Threaded Cap Diameter 70mm without Pressurisation Flange Version 10 µm Foam with Anti-Splash Option Plastic Basket
Price only available on request
Item Designation
STAUFF Item No.
SPBN-2-O-10-S080-A
6100035741
Item Designation
STAUFF Item No.
SPBN-2-O-10-S080-A
6100035741
SRV-050-G12
Diffuser Thread: 3/4" BSP
Price only available on request
Item Designation
STAUFF Item No.
SRV-050-G12
1910000420
Item Designation
STAUFF Item No.
SRV-050-G12
1910000420
SRV-114-G16
Diffuser Thread: 1" BSP
Price only available on request
Item Designation
STAUFF Item No.
SRV-114-G16
1910000421
Item Designation
STAUFF Item No.
SRV-114-G16
1910000421
SRV-114-N16
Diffuser Thread: 1 NPT
Price only available on request
Item Designation
STAUFF Item No.
SRV-114-N16
1910001835
Item Designation
STAUFF Item No.
SRV-114-N16
1910001835
SRV-200-G20
Diffuser Thread: 1 1/4" BSP
Price only available on request
Item Designation
STAUFF Item No.
SRV-200-G20
1910000422
Item Designation
STAUFF Item No.
SRV-200-G20
1910000422
SRV-200-N20
Diffuser Thread: 1-1/4 NPT
Price only available on request
Item Designation
STAUFF Item No.
SRV-200-N20
1910001408
Item Designation
STAUFF Item No.
SRV-200-N20
1910001408
SRV-227-G24
Diffuser Thread: 1 1/2" BSP
Price only available on request
Item Designation
STAUFF Item No.
SRV-227-G24
1910000423
Item Designation
STAUFF Item No.
SRV-227-G24
1910000423
SRV-227-N24
Diffuser Thread: 1-1/2 NPT
Price only available on request
Item Designation
STAUFF Item No.
SRV-227-N24
1910001407
Item Designation
STAUFF Item No.
SRV-227-N24
1910001407
SRV-454-G32
Diffuser Thread: 2" BSP
Price only available on request
Item Designation
STAUFF Item No.
SRV-454-G32
1910000424
Item Designation
STAUFF Item No.
SRV-454-G32
1910000424
SRV-650-G40
Diffuser Thread: 2 1/2" BSP
Price only available on request
Item Designation
STAUFF Item No.
SRV-650-G40
1910000425
Item Designation
STAUFF Item No.
SRV-650-G40
1910000425
SRV-950-G48
Diffuser Thread: 3" BSP
Price only available on request
Item Designation
STAUFF Item No.
SRV-950-G48
1910000426
Item Designation
STAUFF Item No.
SRV-950-G48
1910000426

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Slowing and settling return flow

Diffusers reduce fluid aeration, foaming and noise generated in hydraulic reservoirs

One of the basic prerequisites for the smooth operation of hydraulic systems is the selection of a well-designed hydraulic reservoir based on the specific requirements, which does not only supply the system with sufficient pressure fluid. It also uses suitable measures (e.g. filler breathers and sufficient tank pressurisation) to prevent solids, water and air from entering the system, contaminating the oil and affecting the function of sensitive components, which quite often results in expensive downtimes and unplanned oil changes.

Another factor that should not be underestimated is surface foaming which can form through uncontrolled return flow of hydraulic oil from the return line into the tank. As an air-in-oil dispersion, this can cause a number of operating problems throughout the system. These include efficiency losses for the energy used, operating malfunctions and a reduced service life of the oil. This can lead to marked oil loss due to oil excess foaming. Cavitation in the pump also increases noise generation in the system drastically, which in extreme cases can lead to a total breakdown and therefore to a system standstill.

This is where diffusers come into play: The design of the components is typically based on two concentric steel tubes where the perforated outlet sections are offset to each other, slowing down the oil in the return flow and settling it effectively. This can prevent the formation of oil foam and permanently reduce noise generated in hydraulic reservoirs. It also effectively prevents the raising of sedimentation and soil deposits from the bottom of smaller tanks. 

Diffusers are an ideal supplement to return-line filters with threaded outlets. They are connected directly to the return line or to the filter bowl of the filter housing. 

The diffusers are positioned fully underneath the minimum liquid level of the reservoir, ideally with the closed surface of the outer steel tube facing the suction end of the pump.

Main Characteristics of STAUFF Diffusers

  • Suitable for use with Mineral and Petroleum based hydraulic fluids (HL and HLP)  

  • Lengths between 109 and 272 mm 

  • Diameters between 64 and 150 mm 

  • Connection with female thread: 

  • 3/4" BSP to 3" BSP according to ISO 228 

  • 3/4" NPT to 3" NPT according to ANSI B1.20.1 

  • Alternative sizes and special designs available on request. 

  • Operating temperature range from -20 °C to +100 °C 

  • Maximum working pressure up to 20 bar in the return-line 

  • Threaded end cap made of Aluminium  

  • All other components made of Steel, zinc-plated 

Buy STAUFF Items Online

Via the STAUFF online shop, commercial customers and users can purchase and order the products listed in this category online – quickly, easily, safely, and with fair pricing conditions.

STAUFF provides direct access to a comprehensive range of products with more than 50,000 individual standard hydraulic components in 10 product groups for mechanical and plant engineering and for industrial service and maintenance. In addition, STAUFF is also able offer individually designed system and special solutions according to customer's requirements.

A wide range of original STAUFF products are permanently available from stock.

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