| 摘要 |
Pressure reducer for fluid distribution networks (mains), including a mobile element which is in equilibrium under the action of the pressure of the fluid in an outlet pipe and the force exerted by a spring and which is provided with a seal which provides sealing with the walls of a chamber in which the said mobile element slides, characterised in that between the said walls and the mobile element (9) is provided a ring (15) of self-lubricating material, the axial dimensions of which are at least equal to the length of the stroke (travel) of the mobile element, the seal (17) associated with the mobile element (9) being in engagement with the ring. <IMAGE>
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