FAQs: Hydraulic filters

2nd Quarter 2010 Hydraulic systems & components

What are duplex filters and why should I consider using them?

According to a Donaldson Filtration Solutions spokesperson, “Because they are so convenient. One can accomplish filter change-out without having to shut the system down.”

The swap-out procedure is as follows:

1. Divert the flow from filter A to filter B.

2. Change filter A.

3. Then reconnect the flow to A.

Typically, a valve is required for duplexing two filters. For three or more filters, a manifold and two valves are normally required.

Donaldson’s HMK series Duramaxo filters are particularly well-suited to duplexing because, despite them being spin-ons, they can still handle high pressures.

Should I use synthetic or cellulose filter media?

While cellulose is appropriate for some applications, synthetic media typically offers the lower differential pressure, higher temperature resistance, and longer shelf life.

Synthetic filters can also be used with a greater variety of fluids and are more chemically stable.

Cellulose elements are usually less expensive, but will probably have to be changed out more often.

What is the difference between 'static' pressure and 'working' pressure?

Static pressure is the maximum rated pressure that the filter assembly can handle before it bursts apart.

Working pressure is the reasonable pressure the filter can handle for a sustained length of time under controlled cycle fatigue conditions.

What factors do I need in order to calculate filter size?

Flow rates, pressures, and the type of oil used.

For more information contact Taryn Ternent, Donaldson Filtration Systems, +27 (0)11 997 6078, [email protected], www.donaldson.co.za

Further reading:

Oil-free beer and wine processing
Pneumatic systems & components Hydraulic systems & components
The food and beverage industry depends on superior quality, 100% oil-free compressed air to eliminate the presence of unwanted oil vapour throughout the production line.

Read more...

---

Extending the life of hydraulic cylinders and hoses
Hydraulic systems & components
Hose saver protection sleeves extend the life of hydraulic and pneumatic hoses by eliminating unnecessary expenses from downtime, oil loss, contamination, and replacement hoses.

Read more...

---

Hydraulic connectors with residual pressure
Editor's Choice Hydraulic systems & components
Hydraulic connections are vital in both outdoor and indoor industrial machinery. However, the hydraulics lines frequently require connecting and disconnecting for maintenance or changeover. The goal is to enable quick, easy swaps to enhance machine flexibility and productivity.

Read more...

---

Sun carries the load
Axiom Hydraulics Hydraulic systems & components
When valuable lives are hoisted in the air, reliable load holding technology is at its utmost importance. That’s why you can count on Sun’s excellent load holding cartridge valves.

Read more...

---

How to protect against water hammer
SA Gauge Editor's Choice Hydraulic systems & components
Water hammer is a high-pressure surge or wave created by the kinetic energy of moving fluid when it is rapidly forced to stop or change direction, altering the liquid’s velocity. The progression of the water hammer shockwave needs to be detained and slowed before reaching the instrument sensor. SA Gauge manufactures several such devices in order to achieve this.

Read more...

---

Axiom ups its game
Axiom Hydraulics Editor's Choice Hydraulic systems & components
In today’s competitive market, manufacturers of hydraulic components are constantly challenged to find better, faster and cheaper ways of producing parts. Axiom Hydraulics has met the challenge, and can now deliver a product with superior performance and significant cost savings for its customers.

Read more...

---

Condition monitoring for critical hydraulic equipment
Hydrasales Hydraulic systems & components
Systems maintenance personnel often classify equipment as critical, based solely on its value. Instead, critical equipment should be determined by its importance to the operation and the objectives of the organisation.

Read more...

---

Hydraulic bolt tensioning
Bearing Man Group T/A BMG Hydraulic systems & components
BMG’s Nord-Lock bolting solutions include Boltight hydraulic bolt tensioning tools, which can be used to tighten bolts simultaneously, ensuring even preload in industrial applications and extreme environments, ...

Read more...

---

How to get the best of both worlds with hydraulics and electric
Editor's Choice Hydraulic systems & components
While battery technologies continue to evolve and overcome challenges that have previously restricted more rapid electrification adoption rates, hybrid electric systems are well positioned as an ideal interim solution.

Read more...

---

Create and recover energy all in one check valve
Axiom Hydraulics Hydraulic systems & components
Energen is a new, high-efficiency check valve from Sun Hydraulics that allows free flow from inlet to outlet, and blocks flow in the opposite direction. Composed of an integrated generator that converts ...

Read more...

---