Samson 3510 Mounting And Operating Instructions

Also see for 3510: Mounting and operating instructions

42 EB 8091-1 ENMalfunctions8 MalfunctionsDepending on the operating conditions, check the valve at certain intervals to prevent possi-ble failure before it can occur. Operators are responsible for drawing up an inspection plan.SAMSON's After-sales Service department can support you to draw up an inspection planfor your plant.8.1 TroubleshootingMalfunction Possible reasons Recommended actionActuator or plug stem does notmove on demand.Actuator is blocked. Check attachment.Unblock the actuator.Signal pressure too low Check the signal pressure.Check the signal pressure line forleakage.Actuator or plug stem does notmove through the whole range.Signal pressure too low Check the signal pressure.Check the signal pressure line forleakage.The valve leaks to the atmo-sphere (fugitive emissions).The packing is defective. Replace packing (see sec-tion 7.2) or contact SAMSON'sAfter-sales Service department.Packing tightened incorrectly. See section 5.3, Adjustablepacking. Contact SAMSON's Af-ter-sales Service departmentwhen it continues to leak.Version with bellows seal: themetal bellows seal is defective.Contact SAMSON's After-salesService department.Gasket worn out. Replace body gasket (see sec-tion 7.1) or contact SAMSON'sAfter-sales Service department.Increased flow through closedvalve (seat leakage)Dirt or other foreign particles de-posited between the seat andplug.Shut off the section of the pipe-line and flush the valve.Valve trim, particularly with softseat, is worn.Replace seat and plug (see sec-tion 7.3 or contact SAMSON'sAfter-sales Service department).Tip