Flomatic Flo-Flex 745 Manuale - Pagina 3

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FLOMATIC'S

FLO-FLEX

Swing Check Valve

Operation, Maintenance and Installation Manual

INTRODUCTION

The Flomatic

Flo-Flex

Model 745 Swing Check Valve has been designed to give years

of trouble-free operation during normal operation. This O&M owners' manual will

provide you with the information you need to properly install and maintain the valve and

to ensure a long service life. The Flo-Flex

fluid flow in one direction and closes automatically to prevent back-flow in the reverse

direction (see flow arrow cast into the valve body for flow direction). The Flo-Flex®

Model 745 swing check is design to meet the flange to flange laying length

according to AWWA C508. The valve angled valve seat and fully encapsulated,

resilient disc, is capable of handling a wide range of fluids including flows

containing suspended solids.

Flomatic

can provide an optional manual back-flush device that can be installed

on the bottom of the valve to allow manual backflow through the valve in the

reverse direction (Option Model 745 "BF"). Optional Position Indicators (Option Model 745 "PI") PI and Limit Switches

(Option Model 745 "LS") may also be mounted on the valve access cover to provide position indication.

The Valve Size, Flow Direction, Maximum Working Pressure are cast on to the side of the valve body surface for

reference. The "Maximum Working Pressure" is the non-shock pressure rating of the valve at "Max Temperature"

of 140°F (60°C). The valve shall not be subjected to any higher pressure or temperature above the valve

maximum standard rating.

RECEIVING AND STORAGE

Inspect valves upon receipt for damage in shipment. Unload valve carefully to the ground without dropping. Do not allow

lifting slings or chains to come in contact with the seat or flange sealing surface area; use eyebolts or rods through the

flange holes on large valves. Valves should remain crated, clean and dry until installed to prevent weather related damage.

For long term storage greater than six months, the rubber surfaces of the disc should be coated with a thin film of FDA

approved grease such as "Super Lube". Do not expose disc to sunlight or ozone for any extended period as elastomer will

get damaged and degraded.

DESCRIPTION OF VALVE OPERATION

The valve is designed to prevent reverse flow automatically. During system flow

conditions, the movement of the fluid forces the disc to the open position allowing

100% flow area through the valve. The valves rubber coated steel disc

automatically returns to the closed position to prevent reverse flow. Several

optional features are a Backflush device, (Model 745 BF), Position Indicator

(Model 745PI), Limit Switch (Model 745LS). These valve product options are

described in more details below.

Fig 2. Flo-Flex

Cross Section

check valve is opened automatically by the

VALVE CONSTRUCTION

The Flomatic

Flo-Flex

of rugged Ductile Iron with a rubber encapsulated valve disc. The rubber coated valve

disc is the only moving part assuring long life with minimal maintenance. The general

Item #

Qty.

The

A/R

*Optional EPRM or Viton Coated Steel

Flomatic Corp, 15 Pruyn's Island, Glens Falls, New York 12801

Phone: 518-761-9797

Swing Check Valve is constructed

Description

Material

Body

Ductile Iron

Cover

Ductile Iron

Disc*

Buna coated Steel

Gasket

Buna

Cover Bolt

Steel

Plug

Malleable Iron

Fax: 518-761-9798

www.flomatic.com

Standard Max Working Pressure:

2" thru 24" 250 psi

Standard Max Temperature:

140°F (60°C)

FIG 1. Flo-Flex®

Swing Check Valve

details

ASTM

illustrated in Fig. 2. The body (1)

A536

flanged for connection to the

A536

--------

pipeline with an access cover (2).

--------

disc (3) is retained by the cover.

SAE Grade 5

--------

745PI-BF-LS-ASC Rev. B

construction

are

October 12, 2018