10 Reasons to use Piston valves

M&M Angle Seat Piston Valve

M&M International Piston Actuated Valves are manufactured in Italy, using materials of the highest quality.

Piston actuated valves use an external control media to pilot the actuator, where a piston valve connects directly to the main seal that closes onto the orifice, controlling the flow of liquids and gases.

M&M International Piston Valves are highly recommended under these conditions:

The media contains dirt particles
Highly viscous media (up to 600 cST (80°E); 1 centistoke = 1 mm2/s)
High flow volumes
High temperatures
Damp environments or hazardous locations

There are four Piston Actuated Valve variations;

Technical Information

A modified PTFE has become the main seal material used in M&M Piston Actuated Valves since 2004, when it replaced the original PTFE material seal.

The modified PTFE seal provides the following benefits over its predecessor:

Lower porosity and permeability
Fewer void spaces
Higher elasticity
Reduced deformation under load
Better chemical resistance to controlled media
Smoother surface and improved design flexibility

The standard bonnet seals consist of 2 ‘V’-shaped FKM gaskets and a package of 25% graphite-filled PTFE gaskets.

Piston Actuated Valves for High Temperatures

M&M can offer a range of Piston valves capable of working temperatures of up to 200°C, providing that the valve pressure limits are not exceeded.

The main differences, in regards to the materials in the design, are as follows;

A change of the actuator material: From standard PA6 to PA66 filled with 30% fibreglass
All valves with DN > 25 with fixed plug design (to withstand turbulence caused by steam at high speed)
Special design of bonnet chevrons, all are made of 25% graphite-filled PTFE.