Pipeline ancillaries

Steam/Water Mixing Stations - MkII Valve

Description

The piston is lifted by the cold water supply. If the cold water supply

stops the piston will fall, closing the steam valve. To sustain this

design integrity the piston must move freely. Scale build-up will

prevent movement and regular maintenance must be carried out

to ensure the valves safe operation.

Range

The MkII Spirax Sarco steam / water mixing station is designed to

provide hot water economically by blending steam and cold water

quickly to the required user temperature. The temperature can be

changed by turning the adjustment knob. As the valve is not

thermostatically controlled, in order to maintain a fixed hot water

temperature the cold water pressure and flowrate must be

constant. The installer must ensure that the Local Water Board

Regulations are adhered to, with regard to direct use of mains

water supply. MkII valves are supplied from 2002 onwards.

Steam

Operation

inlet

The mixing valve employs a piston to lift and open the steam valve.

Cold

water

inlet

The TCO1 temperature cut-out valve activates at a temperature of

95°C to limit the discharge of steam in the event of a system fault.

Each steam / water mixing station is supplied with isolation valves,

pressure gauges, syphons and cocks, steam traps, check valves,

union joints, strainers, thermometer and TCO1 temperature

cut-out valve.

1⁄2" and 3⁄4" stations can be supplied with an optional high quality

hose, hose rack and gun for hosedown purposes, see TI-P157-05

and TI-P157-22. High capacity 1" and 11⁄2" stations are intended

for fixed installation such as periodic filling of tanks and therefore

no hoses or guns are available.

Hot

water outlet

Optional equipment

7.14.3

Hosedown gun, hose and hose rack (for 1⁄2" and 3⁄4" valves only)

Mixing

Check valve

Ball valve

Strainer

Dial thermometer

Pipe fittings

Temperature

cut-out valve

Pressure gauge

Steam trap

Bronze

Carbon steel

Brass

Stainless steel /

Brass / Bronze

Bronze

Mild steel

Brass

See TI-P029-01

See TI-P133-06

See TI-P164-01

Brass

See TI-P157-18

See TI-P027-01

See TI-P122-01

refer to TI-P157-05.

valve

Hose reel (for 1⁄2" and 3⁄4" valves only) refer to TI-P157-22.

See

Sizes and pipe connections

1⁄2", 3⁄4", 1" and 11⁄2" screwed BSP (inlet and outlet)

Available types

Size

1⁄2"

3⁄4"

1"

11⁄2"

Range °C

Hot water outlet

40 to 90

40 to 90

40 to 90

40 to 90

Typical dimensions / weights - as installed

(approximate) in mm and kg

Size

A

B

C

D

E

Weight

1⁄2"

655

613

120

295

96

13.7

3⁄4"

713

671

130

440

94

15.9

1"

932

867

190

530

125

23.8

Technical data

Mixing valve pressure/spring ranges

Size Spring

Yellow

1⁄2" Green

Black

Red

3⁄4" Blue

White

Red

1"

Blue

White

Red

11⁄2" Blue

White

Steam inlet

Pressure bar g

7.00 to 10.3

3.50 to 7.0

0.35 to 3.5

7.00 to 10.3

3.50 to 7.0

0.35 to 3.5

7.00 to 10.3

3.50 to 7.0

0.35 to 3.5

7.00 to 10.3

3.50 to 7.0

0.35 to 3.5

Minimum cold waterflow

l/min to open steam valve

4.5

2.7

2.2

8.1

6.8

6.8

36.3

31.8

27.2

54.4

54.4

54.4

11⁄2"

1 214

1 154

400

800

148

45.5

C

E

D

Note: Valves are supplied with the intermediate pressure range

spring fitted.

How to order

Example: 1 off 1⁄2" Spirax Sarco MkII steam/water mixing station.

Hosedown stations

Local regulations may restrict the use of this product to below the conditions quoted.

In the interests of development and improvement of the product, we reserve the right to change the specification without notice.

© Copyright 2013

TI-P157-08

Pipeline

Flow l/min

fittings

Minimum to Maximum

2.2 to 108

6.8 to 200

27.3 to 375

54.4 to 550

Materials

A

B

TI-P157-06

ST Issue 9