Standards for liquid controlling equipment

Updated: Jul 29


We have already mentioned more than once the importance of equipment control, which is associated with hydraulic processes, which is why an increasing number of standards are created every day. Since this type of equipment and its scale in the physical sense of this word is also used in smaller enterprises, the specification of documents is quite different. Some international standards were created several years ago and have not lost their relevance to this day. But some technologies require permanent updating, thereby creating the need to create the most relevant documents with a more detailed technological description. Today we will introduce you to international standards created to regulate the use of equipment used using hydraulic systems.

Hydraulic fluid power - Two-port slip-in cartridge valves - Cavities

ISO 7368: 2016


International standardization is a complex action to regulate absolutely every branch of human activity. Regulatory acts are created both at global and local levels in order to minimize financial and physical risks. When it comes to the regulation of mechanical processes, one of the most significant standards today, ISO 7368: 2016, should be mentioned.


This document specifies only geometrical data relating to cavities in which two-port hydraulic slip-in cartridge valves are mounted in order to ensure interchangeability.


NOTE For example, this document does not specify rated pressures. It applies to cavities for two-port hydraulic slip-in cartridge valves which are generally applicable to industrial equipment.


Several documents can regulate different technologies, but in related industries. That is why we recommend that you seek help from specialists in the selection of international standards.

Hydraulic fluid power - Calibration of automatic particle counters for liquids

ISO 11171: 2020


Despite the fact that automation is increasingly taking place in modern industries, the presence of human labor still remains one of the fundamental engines of the organization's progress. That is why regulation by international standards occurs at different levels (security, technology scale and geographic coverage). For hydraulic processes, or rather automatic meters, the most relevant document today is ISO 11171: 2020.


This document specifies procedures for the following:


- Primary particle-sizing calibration for particle sizes 1 µm (c) and larger, sensor resolution and counting performance of liquid automatic particle counters that are capable of analysing bottle samples;


- secondary particle-sizing calibration using suspensions verified with a primary calibrated APC;


- establishing acceptable operation and performance limits;


- verifying particle sensor performance using a test dust;


- determining coincidence and flow rate limits.


This standard is applicable for use with hydraulic fluids, aviation and diesel fuels, engine oil and other petroleum-based fluids. This document is not applicable to particle-sizing calibration using NIST SRM 2806b primary calibration suspensions.


If your field of activity directly or indirectly comes into contact with the specified technology, we strongly recommend having this document available to be sure of a decent level of competitiveness in the modern market.


Pneumatic fluid power - Cylinders with detachable mountings, 1,000 kPa (10 bar) series, bores from 32 mm to 320 mm - Basic, mounting and accessories dimensions

ISO 15552: 2018

International standardization works not only for large-sized equipment, but also for accessories to this equipment (or small parts). For pneumatic equipment using hydraulic processes, a standard has been created such as ISO 15552: 2018.


ISO 15552: 2018 establishes a metric series of basic, mounting and accessories dimensions as required for interchangeability of single or double rod pneumatic cylinders with or without provision for magnetic sensors for a maximum rated pressure of 1,000 kPa (10 bar). ISO 15552: 2018 applies to pneumatic cylinders with detachable mountings.

Since this particular international document is not narrow-profile, it can be applied in completely different types of technologies in the mentioned industry.


Hydraulic fluid power - Pressure-reducing valves, sequence valves, unloading valves, throttle valves and check valves - Mounting surfaces

ISO 5781: 2016


Industrial equipment has not lost its relevance in the era of innovative technologies, which in turn creates the need for its regulation at the global level. Since the exchange of technologies between countries is more and more active every day, then the issue of the availability of international standards in organizations applying the above technologies is a must for reflection. Today, the ISO 5781: 2016 standard is used to regulate and control hydraulic processes in industrial equipment.


ISO 5781: 2016 specifies the dimensions and other data relating to surfaces on which hydraulic pressure-reducing valves, sequence valves, unloading valves, throttle valves and check valves are mounted in order to ensure interchangeability. It applies to mounting surfaces for hydraulic pressure-reducing valves, sequence valves, unloading valves, throttle valves and check valves, which represent current practice; they are generally applicable to industrial equipment.


The presence of international standards is not only an indicator of a quality product, but also significantly affects the perception of the image of a company or organization among analogue services on the market.


Therefore, we strongly recommend that you have at least basic documents for your field of activity available.


Hydraulic fluid power - Four-screw, one-piece square flange connections for use at pressures of 42 MPa, DN 25 to 80

ISO 6164: 2018


Some technical characteristics can directly affect the quality of the final product or service, and as a result, the financial performance of the enterprise. It is in such a situation that the question arises of the mandatory availability of international standards that minimize possible risks. One such example for connectors in hydraulics is ISO 6164: 2018.


This document gives general and dimensional specifications for flanged heads, flange clamps, ports and mounting surfaces applicable to four-screw, one-piece square flange clamp type tube connectors and hose fittings for use at a pressure of 42 MPa [420 bar [1] ]. It also specifies the dimensions of the seals to be used, as well as the grooves that house the seals. These connections are intended for application in hydraulic systems on industrial and commercial products where it is desired to avoid the use of threaded connectors. [1] 1 bar = 0.1 MPa = 105 Pa; 1 Pa = 1 N / m2.


If the purchase of this document can, in your opinion, significantly improve the financial performance and product quality, we strongly recommend that you familiarize yourself with its characteristics in more detail.

Hydraulic fluid power - Online automatic particle-counting systems for liquids - Methods of calibration and validation

ISO 11943: 2021


The introduction of new technologies is taking place in industries more and more actively in the 21st century. One of the most unusual amalgamations of innovation is online technology combined with mechanical processes. Such moments are specially controlled at the international level by such international standards as ISO 11943: 2021.


This document establishes methods for: validating equipment used to prepare secondary calibration suspensions for automatic particle counters; online secondary calibration of automatic particle performing counters; matching two or more online particle counters, i.e. to count the same number of particles at a given size by two APCs associated online; validating online particle counting systems with and without online dilution as used, for example, to measure the filtration efficiency of a hydraulic filter as described in the multi-pass filter test in ISO 16889.


When operating international standards, it is very important to keep them constantly updated. After all, the market does not stand still, as does technology. And the faster your organization responds to updates, the faster it will grow and scale.

Correct analysis of parameters when selecting an international standard


As you can see, the selection of the correct International Standard does not always depend on the last date of its publication. As mentioned in advance, some technologies have not lost their relevance over the past years. Perhaps this situation will change in the near future and new recommendations will be issued to existing documents, however, it should be understood that the norms and rules existing at the moment give you a significant advantage among the market with a high level of competition. By purchasing an international standard, you can be sure that the productivity of your activities, with the correct implementation of the document, will increase exponentially, and the quality of the final product will significantly affect the financial results in a positive direction.

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