Author Archive: Dzyanis

Parker’s Gold Cup pumps: External filtration

Dzyanis June 15, 2023 0 Articles Parker, pump 1707 Views

Have you ever dealt with Parker’s Gold Cup pumps? If yes, you probably noted in the product datasheet, this pump does not require to have filtration of internal charge (boost/replenishing) pumps flow. There is just a short recommendation “the auxiliary pump fluid be filtered to aid in maintaining acceptable cleanliness levels”:

The reason for that is because Parker thinks all close loop systems need to be designed to ensure “the oil tank is protected through filtration from any ingress contamination”. Later I shall show you Parker’s document where this statement is coming from (AS-0018). Actually, question to you: do you agree with this statement?

I do not. I use charge (boost/replenishing) flow filtration for every single close loop pump at every single project via an external filter connection. Moreover, both proportional and servo control systems require even more fine cleanliness level of the element for filtration, therefore for such systems I use two separate filters: for charge flow (usually 10 mkm element) and for servo control flow (usually 2 mkm element).

But there are a couple of problems with the Gold Cup pump external filtration. Although these pumps have ports for external filtration and even a short guide in the datasheet on how to make filtration (screenshot above) due to design of internal galleries is different for all three Gold Cup pump frame sizes, and, in addition, is different for specific side a control system is mounted on, you will not be able to provide a correct filtration and even can destroy the pump if connect external filter in the wrong way. And this problem is not explained and not resolved in the product catalogue.

HAWE online product configurator

Dzyanis August 30, 2022 0 Articles hawe, valve 1596 Views

It was always a challenge for us to configure HAWE proportional multi-section valves such as PSV, PSVF, etc. And I asked many times our vendor about something like an online configurator for HAWE products. You know, the best part of using tools like this is preventing errors, especially in so complicated configurations with a bunch of options. But the best what they suggested is to use HAWE CD with a very old configurator or just send requests to them. What actually is not a time-saving solution.

Here you can directly configure products, access product data, make a customer service request or program your machine control. You can also communicate directly with your contact person via the customer portal. We are looking forward to your feedback and requests in order to continuously optimize and expand our online service offer.
Your HAWE Team

So, what you need to start using product configurator is to make an account in HAWE Customer Portal first:

https://customerportal.hawe.com/

And now, almost for each product at their website you get a link to the “TypeMan+” platform, where you can configure the product. For example here is the link to PSV valve configurator:

https://typegen.hawe.com/?CLASS=C_PSV__110&LAN=en

In addition to the product configurator, you get a spare part catalogue, 3D catalogue and other benefits. Make your life easier!

How to Select, Design, and Install O-Ring Seals

Dzyanis March 20, 2022 0 Articles 1791 Views

Very good and interesting video about O-rings from Tarkka

Video description:

O-rings are the epitome of elegant engineering: The ring itself costs only a few cents, and the groove it goes in is simple and easy to manufacture. But despite this simplicity, the resulting seal is able to reliably hold many thousands of psi of pressure. O-rings are definitely a machine design component you’ll want to be familiar with, and in this video, we’re going to tell you all about how to design seals with them

SUN cartridges and low temperatures

Dzyanis November 8, 2021 0 Articles SUN, temperature 1080 Views

Recently we got a request from the customer to check the system components to work in a low-temperature environment up to -40°C. Most components in the customer’s system were SUN cartridges.

And I was really surprised by the mess of info on the Sun Hydraulic website about seals that SUN uses in their cartridges.

For example, on the “Seals: Materials of Construction” page you can find the manufacturer’s temperature range: from -22° to 230° F (-30° to 110° C) for Buna N (Nitrile) and -22 to 260° F (-30 to 125°C) for Polyurethane O-rings.

But, if you download Technical Product Information PDF from their library, you can find different temperature range for Buna N: -50°F to 200°F which means -45°C..+93°C and no info about Polyurethane O-rings.

This is why I was confused and had a lot of questions to SUN:

1. Why the different info is provided on SUN website?
2. Why there isn’t a choice for Polyurethane O-rings in seal material when selecting cartridges in the SUN catalog?
3. Why SUN has so high temperatures for the low environment for both Buna N and Polyurethane seals?

Really, all competitors have better low-temperature limits for their cartridges, for example:

– Parker’s Nitrile: from -40°C to +93.3°C
– Danfoss/Comatrol, Buna-N: from -40°C
– Bucher, Buna “N”: from -40°C to +120°C
– Doering, Buna N: from -42.7°C to +93.3°C
– Eaton, Buna N: from -40°C to +120°C
– Hydraforce’ Buna “N”: -40°C to +100°C; polyurethane: -54°C to +107°C.

Because it was critical for my application, I have sent a request directly to SUN to get answers to the questions above and have gotten next response: the correct low work temperature for Buna N is -30°C. Сoncerning the polyurethane seals – this is not a standard option, but any cartridge can be assembled with polyurethane o-rings that provides low temperature rate to -40°C. Not a big difference in the price, but because this is going to be a custom modification the delivery time for cartridges (statement on November 2021) is 15..16 weeks (what actually is not bad for SUN).

Just would like to share this experience with you…