DeZurik APCO CDD-9000T Manuale d'uso - Pagina 4

Sfoglia online o scarica il pdf Manuale d'uso per Unità di controllo DeZurik APCO CDD-9000T. DeZurik APCO CDD-9000T 9. Double door check valves

DeZURIK

APCO CDD-9000T Double Door Check Valves

Description

A Double Door Check Valve consists of a valve body, torsion spring loaded hinged doors, and a

resilient seat compression molded to valve body. The spring loaded doors move away from the valve

seat to allow flow in the forward direction, and return to valve seat when upstream flow is stopped.

Lifting the valve improperly may damage it. Do not fasten lifting devices through the seat opening in the

body. Lift the valve with slings, chains or cables fastened around the valve body, or fastened to bolts or

rods through bolt holes in the flanges.

If installation will be delayed, place valve indoors in secure, weather tight storage. If temporary outside

storage is unavoidable, make sure a vermin proof rain cover (water shedding tarp, etc.) is secured

around/over the equipment to keep off rain and mud. Skid and set the assembly on a flat, solid, and

well drained surface for protection from ground moisture, runoff and pooled rain water.

The APCO CDD-9000T Double Door Check Valve may be installed in a horizontal or vertical position

(with the flow upward). Valve supports are not needed. The Valve must be installed with the hinge

pin in the vertical position for horizontal flow applications.

•

Before installation, remove foreign material such as weld spatter, oil, grease, and dirt from the

pipeline.

•

Prepare pipe ends and install valves in accordance with the pipe manufacture's instructions for

the joint used.

Do not deflect the pipe-valve joint. Minimize bending stresses in the valve end

connection with pipe loading.

If excessive seat leakage occurs during start-up, recheck the installation and

eliminate any distortion to the valve body.

•

Ensure the valve and pipeline flanges are concentric to ensure proper flange sealing and seat

leakage control.

•

Tighten the flange bolts or studs in a crisscross pattern and minimum of four stages.

Valves with fusion/powder coated exterior paint require flat washers to be installed

under the flange nuts when installing the valve to the pipeline flange to prevent the

paint from cracking or chipping.

D12041

Page 4

September 2015