Flowserve CW41 User Manual

Issue Date: 10/06

GESTRA Steam Systems

Instructions for Installation and Maintenance

Cooling-Water Control Valves Gestramat

CW 41, CW 41/4 PN 16, DN 25 – 100 mm (1 – 4")

Description

The cooling-water control valves type CW are direct-acting proportional controllers for installation in cooling water or brine return lines. They ensure that the cooling-water outlet temperature is maintained at a preset value, calculated for the process requirements.

When using cooling-water control valves, higher temperatures are possible than with an uncontrolled process. As a result of the larger heat absorption by the coolingwater or brine, cooling-agent and energy consumption are reduced.

The regulator of the CW 41 consists of one, two or three thermostats 3 (depending on the valve size) mounted in series within a double-seat valve cone 2. The upper cone closes tight whilst the lower one is designed with a tolerance to form a leak passage (“s” cone), or the leak passage is formed by a borehole in the cone (“r” cone).

The thermostats 3 contain an elastomer thermal expansion material (“n” and “k” thermostats) or wax (“w” thermostat). Under the inﬂuence of heat the volume of the thermostats increases, projecting a pin which is included in the thermostat body.

The lift of the thermostats is transmitted to the valve cone via the pin of setting device 6, supporting the thermostats. With rising cooling-water outlet temperature, the valve cone is moved in the opening direction against the force of the spring. When the temperature drops again the valve cone is moved by the spring 7.1 in the closing direction.

With the aid of setting key 11 that can be removed and ﬁts all valve sizes, the position of the setting pin can be varied to obtain higher or lower cooling-water outlet temperatures (see “Temperature Adjustment”).

Even if the valve is closed, a continuous bleed ﬂow ensures a sensitive response. The bleed ﬂow can be increased by screwing setting screw 7.6 to the right (e.g. in the case of a long line between heat exchanger and CW).

Installation

1. Screw pressure gauge (item 15) into the inlet (point A in ﬁgure opposite) and thermometer (item 16) into the outlet (point B in ﬁgure opposite). To avoid damaging these instruments tighten them only at the hexagon using a spanner (A.F. 14 and 19 mm).

2. Always install CW 41 in the cooling-water return line as close as possible to the heat exchanger. Flow is in the direction of arrow. Recommended position: in horizontal lines, setting device 6 pointing downwards.

With free drainage the CW should be installed so that

it will not run empty, so as to prevent the formation of deposits. If there is the danger of freezing it might be useful to provide a drain valve in the water pocket (see schematic diagram below). If necessary, the valve can be emptied by unscrewing setting device 6.

Note: When the CW valve is closed, the cooling zone is

under full pump pressure.

Pressure / Temperature Rating

Max. service pressure 16 barg (230 psig)

Max. differential pressure 6 bar (85 psi)

Temperature ratings see “Adjustment Table”, page 4.

Differential pressure = inlet pressure minus outlet pressure.

Product Range A4

CW 41 CW 41/4

R ¼"

7.6

A = Connection for pressure gauge B = Connection for thermometer

CW 41 DN 40, 50

7.1 3

R ¼"

Setting pin

Maintenance

The CW 41 does not require any particular maintenance. If there is the danger of freezing, the valve should be emptied.

Parts List CW 41

Item No. Description Stock code Number Material Hints

1.1

2 Valve cone:

2.1 O-ring

3 Thermostat complete:

4 Retaining ring 010332 1 S.S. (1.4034) DIN 472 21.1 x 1

5 Gasket 010333 1 DIN 7603 Steel A 26 x 31 mm

7.1 Spring

7.2 *) Gasket

7.3 Cover – 1 S.G. iron (0.7043) no spare part

7.4 Stud bolt

7.5 Nut

7.6 Setting screw 004965 1 S.S. (1.4122)

7.8 “Seal-lock” nut 004800 1 8.8 M 8

7.9 *) Gasket 000992 4 DIN 7603 – S.S. (1.4301 N) A 14 x 18

7.10 Plug 085289 4 Steel (1.0501) ¼" BSP

11 Adjusting key 004962 1 Brass (2.0401)

15 Pressure gauge 1) 004704 1

16 Thermometer 1) 184596 1 Measuring range: –30 °C to 100 °C

) With “k” thermostat use:

– Setting device complete with extension (stock code 031135) – Pressure gauge with extension (stock code 031154) and – Thermometer with extension (stock code 184598)

*) Parts subject to wear (stock keeping recommended)

Body Seat

“r” cone complete

“s” cone

“w” thermostat

“n” thermostat

“k” thermostat

Setting device complete 1) Threaded bush Gasket

DN 25 mm (1") DN 40, 50 mm (1½, 2") DN 80, 100 mm (3, 4")

DN 25-50 mm (1-2") DN 80, 100 mm (3, 4")

– –

184283 184288 184292

004940 004980 030000

030092 030093 031787

004941

030040

030042

004953 031837 010501

004950 004981 030001

184372 184373 184374

010135 010140

010514 013123

1 2

S.G. iron GGG-40.3 (0.7043)

S.S. (1.4122 / 1.4401)

no spare part

no spare part, inerference-ﬁt

1 Cast brass (2.0290)

1 EPDM for “r” cone only

1 2 3

Body:

Brass (2.0380)

Pin:

Austenitic satinless steel

(1.4571)

2 3

1 1 1

Brass (2.0380) / S.S.

Steel (1.0356)

DIN 7603 Steel

A 40 x 47

{ 100 mm (3, 4")

only for DN 80,

1 1

Austenitic stainless steel (1.4571)

1 1

Graphite/CrNi

4 6

DIN 939 – 5.6 DIN 939 – 5.8

DIN 934 – 5

DIN 934 – Steel (1.7258)

45.5 x 75 x 1.0

55.5 x 90 x 1.0

92.5 x 136 x 1.0

M 8 x 22 M 10 x 25

M 8 M 10

Measuring range:

0 – 6 barg (0 – 85 psig)

Note: CW 41 for usual industrial cooling water. CW 41/4 for salt water, ammoniacal water and chlorinated hydrocarbons.

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