Jafar 3126 Bedienings- en onderhoudshandleiding - Pagina 3

Blader online of download pdf Bedienings- en onderhoudshandleiding voor {categorie_naam} Jafar 3126. Jafar 3126 9 pagina's. Gate valves with soft seals with threaded connections

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1 TECHNICAL DESCRIPTION

1.1 PRODUCT NAME AND FEATURES

The subject of this O&MM is:

Type 3116 and 3126 cast iron threaded gate valves with soft seals.

- full smooth walled bore design

- wedge (closure) embedded in 100% pure elastomer

- non-rising spindle

- stem head-type seal in valve cover (O-rings)

1.2 PURPOSE

The Type 3116 and 3126 gate valves with soft seals are intended for water supply systems, especially

for potable water, sewage systems, and industrial processing systems. The valves are intended for surface

and underground systems and must be installed in horizontal pipelines.

1.3 TECHNICAL SPECIFICATION

The threaded gate valves with soft seals are intended for transporting potable or industrial water and

other liquids (if approved by the manufacturer).

- temperature range: -10°C to +70°C

- nominal diameter range: DN25 – DN50 [mm],

- maximum medium flow rate:

- driving torque at opening start and closing end are listed below:

- fitting actuation: in the basic version, the direction of damper closing is clockwise (to the right)

upon special request the closing direction may be opposite.

the valve connection thread design is acc. to EN 10226-1

normal product grade [A].

installation length: in accordance with plant documentation

nominal pressure PN:

2 DESIGN

2.1 FITTING DESIGN DESCRIPTION

TYPE 3116 and TYPE 3126 threaded gate valves with soft seals manufactured by F.A. "JAFAR" S. A.

feature a smooth walled bore, a non-rising stem, and an O-ring spindle seal installed in a head-type valve cover.

The stem is guided by a bushing in the valve cover neck and a sealing plug. The stem seal is provided by the plug

sealing assembly, which is a system of O-rings. The gate valve closure is a cast iron wedge completely coated

with rubber and featuring a stem nut located on the wedge lug (for DN40 and DN50 sizes). The stem is equipped

with an interlocking collar installed by necking. From the bottom the stem collar rests on a seat in the head via a

bushing which acts as a sealed bearing. In case of sizes DN25 and DN32 the stem is solid and is not fitted with a

bearing in the form of a sealing bushing but the wedge insert consists of a brass forging with thread. The plug is

secured against unscrewing using a spring wire ring installed above the flange. The valve cover to body joint is

made with hexagon socket head cap screws mounted flush with the valve cover and secured with paraffin

compound. The valve cover to body seal is a rubber gasket which also seals the bolts to prevent any leaks from

- liquid: max. 4 [m/s]

- gas: max. 30 [m/s]

DN [mm]

Mmax [Nm]

OPERATING AND MAINTENANCE MANUAL

-0.6 MPa

-1.0 MPa

-1.6 MPa

12-2016