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PNEUMATIC VALVES: THE BENEFITS OF LUBRICATION

valvola pneumatica lubrificazione per riduzione attrito

 

The lubrication of pneumatic valves is based on two fundamental principles:

  • Reduction of friction between the valve body and dynamic gaskets
  • Compensation for the decay of the sealing effect due to gasket deterioration

Ring seals in pneumatic valves play the fundamental role of isolating pressure chambers in a dynamic environment that is unbalanced, tending towards higher operating frequencies and speeds along with shorter strokes than in pneumatic cylinders.

Although compressed air circuits are equipped with an oil lubrication system (to help reduce sliding friction of air shut-off and actuating components), market demands are geared more towards greater durability and reliability, with particular attention to the choice of lubricating grease to be used between the gasket and valve body.

METAL-RUBBER FRICTION

In the absence of a homogeneous lubricating film, O-rings, seals and gaskets deteriorate rapidly. For this reason, it is necessary to encase them with a lubricating grease designed to:

  • Limit static and dynamic friction coefficients between the seal and valve body
  • Facilitate insertion into the housing without damaging the sealing profiles
  • Resist leaching processes generated by pressure differences
  • Help to hold the seal in place
  • Improve operating efficiency by limiting air leakage

The guarantee of smooth valve operation can only be achieved by checking the compatibility of the lubricant and seal material.

Looking for lubricating solutions for pneumatic cylinders and valves?

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LUBRICATING GASKETS IN PNEUMATIC VALVES

cilindri compatti lubrificazione per evitare lo stick slip

 

The rubber-metal coefficient of friction is amongst the highest there is. Whilst this condition, together with the hardness value of the gasket, is set by the designer to ensure the "sealing effect", it also raises a potential threat of wear.

The choice of seal-body lubricating grease in a pneumatic valve is subject to an analysis of the application context and the tribological system as a whole, involving:

  • Operating temperature range
  • Type of fluid intercepted (such as oxygen)
  • Incidental contact with food (NSF certification H1)
  • Possible incompatibilities with the service (such as for valves used in the painting industry) or with silicone greases
  • Type of gasket materials

The most commonly-used materials for the manufacture of gaskets in pneumatic valves are chosen according to the service and application context, such as:

  • NBR (nitrile rubber)
  • HNBR (hydrogenated nitrile)
  • PUR (polyurethane)
  • EPDM
  • FKM (Fluorinated)
  • SIL (Silicone)

The risks of interaction between lubricant and seal should always be assessed beforehand to prevent seals from losing their original mechanical properties.

This presentation deals with the case of EPDM seals in contact with mineral oils and PAO and the catastrophic consequences that this combination can generate.

Special attention must also be paid to NBR gaskets, which are usually suitable for contact with mineral lubricating greases or PAO. However, there are some formulations that tend to increase their volume and hardness, causing valves to block!

Lubricating solutions for pneumatic cylinders and valves, discover your best solution!

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Discover the main applications of our lubricants for pneumatic valves

Silicone grease for low-friction pneumatic cylinders

Synthetic grease with low-friction ceramic lubricant suitable for broad temperature ranges
PNEUSYNTH 500 TH

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grasso al silicone per cilindri pneumatici

Pneumatic valve lubrication for oxygen

Lubricating grease based on fluorinated compounds and PTFE, ideal for extended operating cycles
PNEUSYNTH 985 OX

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lubrificazione valvole pneumatiche per ossigeno con Pneusynth 500 OX

Rodless pneumatic cylinder lubrication

Synthetic lubricating grease for NBR and polyurethane sliding on metal, ideal for unbalanced loads
MACONPLEX TX 350

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cilindri pnaumatico senza stelo lubrificante sintetico

Lubrication of pneumatic control valves

Silicone-based synthetic grease suitable for pneumatic  valves for high air flow distribution

FLUOROSIL 615 

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Fluorosil 615 grasso per valvole pneumatiche e di controllo
grasso lubrificante per cilindri compatti guidati

Guided compact pneumatic cylinders

Synthetic lubricating grease for reducing static friction and energy absorption                                       MACONSYNTH 640 PN

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lubrificante per assemblaggio oring e guarnizioni

Gasket and O-ring assembly 

Facilitates insertion, prevents damage, evaporates and holds gaskets in place
GHOST EMULSION 08

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grasso lubrificante sintetico per cilindri pneumatici omologato contatto alimenti

Food-approved grease for pneumatics

 Synthetic lubricant for pneumatic cylinders, NSF H1-certified for incidental food contact

FLUOROSIL 607 FG

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Customised lubricants for your project

in 3, 2, 1...

Step 1

Study of the application context

analisi delle condizioni di esercizio in un sistema tribologico

Let us analyse the component to determine the purpose of the lubricant. We evaluate materials, the gases contains within, the thermal operating range, the coefficient of friction, the type of load to which it is subjected, the speed and dynamic operating environment.

 

Step 2

Sampling in 3 weeks

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We formulate an initial composition and, thanks to innovative rapid prototyping, guarantee a test sample in less than three weeks to verify functionality. We continue with successive formulations until your goal is achieved.

 

Step 3

Replicable small batch production

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Once identified, we are able to exactly reproduce the ideal formulation, even in small production batches starting from 40 kilograms. Thanks to a versatile, scalable and replicable system, we fulfil all your supply needs.

 

THE MARKET OFFERS MANY PRODUCTS FOR INDUSTRIAL LUBRICATION. YET, ONLY WE CAN CREATE YOUR IDEAL SOLUTION.

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