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Nuovo Pignone Spa

Nuovo Pignone Srl

Nuovo Pigone Srl

Nuovo Pignone Tecnologie Srl

Carmelo Maggi

Leonardo Tognarelli

Riccardo Bagagli

Alberto Babbini

Nicola Campo

Franco Graziani

Jan Wojnar

Alessio Capanni

Michele Sanesi

Guido Pratelli

Tognarelli Leonardo

Franco (deceased) Graziani

A method of manufacturing a packing cup for a hyper-compressor is described. The method comprises the following steps:

Packing cups manufacturing

A packing case for a plunger or a piston rod of a reciprocating machine comprises packing cups, each packing cup comprising a body with a hole for the passage of the plunger or rod and a sealing ring seat for housing a sealing ring which slidably bear against the plunger or rod. Packing cups are aligned with each other in series. The packing case comprises lube oil ducts for supplying lube oil from an end of the packing case to the sealing ring seat. Each packing cup comprises sectors, each sector comprising at least lube oil duct portions. The packing cups are positionable to bring, one sector at a time in an activation position where some of the lube oil duct portions of the sector are connected with the lube oil duct portions of an adjacent packing cup to form lube oil ducts. The packing cups are lockable.

Packing case for reciprocating machine and method of assembling the same

Disclosed is a differential pressure valve comprising: a valve body, the valve body having at least one flow inlet and one flow outlet: at least one shutter, the shutter being movable between an open position and a closed position under a differential pressure across the valve; at least one flow passage from the flow inlet to the flow outlet; at least one biasing member configured to bias the shutter towards a closed position so as to block the flow passage through the flow inlet. The biasing member is a non-linear biasing member.

Differential pressure valve with reduced spring-surge and method for reducing spring surge

A differential pressure valve is disclosed, comprising: a valve body, the valve body having at least one flow inlet and one flow outlet; at least one shutter, the shutter being movable between an open position and a closed position under a differential pressure across the valve; a flow passage from the flow inlet to the flow outlet; at least one biasing member configured to bias the shutter towards a closed position so as to block the flow passage through the flow inlet. The biasing member comprises at least two springs arranged in parallel, one of the springs having at least one resonance frequency different from at least one resonance frequency of the other of the two springs.

Differential pressure valve with parallel biasing springs and method for reducing spring surge

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Florence, Italy

Carmelo Maggi