This is what we have learnt about fitting hydraulic seals into our pumps. They will be relevant to most other hydraulic equipment. We will add to it and are always happy to receive feedback. Contents: Three tips for easy hydraulic sealing before you start. Things to beware when you’re stripping hydraulics down! Our five big [...]
How picking the right elastomeric hydraulic seal material is more than just chemistry and a catalogue. Use a seal material catalogue Useful elastomer materials What to watch out for Formulations change over time Specialist compounds Shelf life Machined seals Talk to an applications engineer After 30 years, Sarum Hydraulics knows quite a lot about seals [...]
We use these capped piston rod bearing seals extensively. Trelleborg call this type of seal a “stepseal”, although lots of people produce their own versions. Why do we like them? They offer extended life, cope with fluids with poor lubricity and allow you to easily swap the elastomeric O ring that fits under them to [...]
Just like the stepped piston rod bearing seals, we use these capped piston seals extensively. Why? They offer extended life, cope with fluids with poor lubricity and allow you to easily swap the elastomeric O ring that fits under them to cope with a wide range of fluids and temperatures. A moulded seal rarely gives [...]
Why do we like U seals? If you don’t need to offer a wide range of fluids and temperature ranges using one size of groove, a U seal for a piston rod bearing can be a great choice. Pick polyurethane (PU) and you have a remarkably rugged seal. The temperature range of down to -30 [...]
As someone who has more than once been left unconvinced that a thickness called up on a drawing was what had been produced, I was interested to read of last week’s awful legal case where a new yacht had run aground, the hull split and the owner brought an action against the yacht builder claiming that [...]
Just a simple round up from what we have learnt about seal materials over thirty years. There are no end of sites on the Web on seal materials and compatibility. There are manufacturers like Parker on www.parker.com . There are lots of great distributors. As usual, feel free to comment, even if something is wrong. [...]
After thirty years of manufacturing our Micropac pressure and hydrostatic test pumps, we know a thing or two about leaks. The easy job is pressure testing your job up to a “proof pressure”, checking that it does not leak or has not permanently deformed and signing it off. Job done! The science is in diagnosing [...]
We certainly know our seals here, we've been designing pumps for 30 years! Here's some of what we've learnt: Think carefully about designing in a seal unique to one manufacturer. It is a right headache if they are suddenly on a 16 week lead. There are Chinese seals and Chinese seals. Bearing in mind that [...]
Hydraulic seals are the cornerstone of all hydraulic systems. We know that manufacturing problems involving these inexpensive parts can prove very disruptive in terms of lost production time. Reliability issues with these seals can inflict reputational damage on a manufacturer that is out of all proportion to the price of the part. So, how come [...]
