DeZurik APCO CVS-250A 사용 설명서 - 페이지 5

{카테고리_이름} DeZurik APCO CVS-250A에 대한 사용 설명서을 온라인으로 검색하거나 PDF를 다운로드하세요. DeZurik APCO CVS-250A 16 페이지. Swing check valves

Installation

(Continued)

•

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.

Fusion/Powder Coated Valves

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.

It is suggested that these valves, which do not require routine scheduled maintenance, be included as

part of the normal facility equipment inspections for any malfunction while under normal usage

conditions.

Packing adjustment may be needed to optimize packing life on initial start-up.

These valves may open or close, swinging the counterweight/spring lever arm without

warning due to flow changes from pumps starting and stopping. Servicing or working

around these valves while the pipeline is under pressure can cause personal injury or

equipment damage.

Workers must be cautious when working around these valves. Relieve pipeline pressure

and lockout the pumps before servicing the valve.

Tighten the gland nuts (A54) evenly only until the packing leak stops.

Caution: Do not over-tighten Packing Gland. Valve can remain open during operation if

packing is too tight. After packing adjustments are made and pipeline is pressurized, visually

inspect valve stroke to ensure proper operation.

Note: Do not continue tightening after leak stops. If packing leak cannot be stopped by

tightening the gland nuts, the packing must be replaced.

October 2018

APCO CVS-250/250A Swing Check Valves

Page 5

DeZURIK

D12003