GMT
  • LOGIN
    Sign in with Facebook
  • |
  • SIGNUP
Our Community
Latest Jobs
Latest Videos
Our Blog
Forum
Latest Events
CLOSE
Latest Members
  • grace michel
  • Asm Aurangzeb
  • Manbha Kupar Khongjee
  • Mohamed Shebl
  • Jibs Bernal
  • chandan pandey
  • Karl B. Lacerda
  • Delando Coriah
  • Mahesh Chalke
  • Parth Upadhyay
Show All

Maritime Forum

TOPIC: SCREW DOWN NON RETURN AND QUICK CLOSING VALVE

SCREW DOWN NON RETURN AND QUICK CLOSING VALVE 05 Apr 2017 11:26 #4772

  • PMA-3777
  • PMA-3777's Avatar
  • OFFLINE
  • More Details
    • Posts:67
    • Karma: 0
(a) Diagram and working of screw down non return valve and screw down lift valve?
(b) Quick closing valve diagram and working?
The administrator has disabled public write access.

SCREW DOWN NON RETURN AND QUICK CLOSING VALVE 08 Jun 2017 02:32 #4844

(a)


As been depicted in the diagram when the flow comes below the valve lid, the fluid will lift the lid and pass but when the flow is in reverse direction the lid will sit on the seat and stop the flow.

On the other hand when the spindle is screwed down the lid will not open in any case. This is what is called SDNR and screw down lift valve.

b) Quick closing valves are fitted in Lube Oil and Fuel oil lines, generally at the tanks on the lines which take the suction from those tanks. It is used to cut-off the oil flow to those line in case of fire.

It could be mechanically or pneumatically activated and when activated it shuts the valve. The shutting of the valve is achieved by collapsing the bridge of the valve which has internal threads on which the treaded spindle of the valve move up and down.

Thus if this internal thread (fitted in the bridge of the valve) itself is brought down it will shut the valve even if it is in open condition.
The administrator has disabled public write access.
Moderators: serex
RSS
How to make new topic in Forum ?

Latest Forum Posts

  • No posts to display.

Forum Statistics

  • Total Users: 16.88k
  • Latest Member: asmaur
  • Total Posts: 3771
  • Total Topics: 3538
  • Total Sections: 12
  • Total Categories: 48
  • Today Open: 0
  • Yesterday Open: 0
  • Today Answer: 0
  • Yesterday Answer: 0
Golden Bollard 2017
SEARCH MEMBERS

SEARCH MARITIME MEMBERS

The Global Maritime Community has many type of players and many are members of this Club. You may find them as per your need by using the filter below

Search Member by Rank / Role

Tools