Pipeline ancillaries Hosedown stations
10
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 2011
TI-P157-08 ST Issue 10
Steam/Water Mixing Valve - Mk II
Description Design
The Mk II Spirax Sarco steam/water mixing valve 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. Mk II valves were supplied from 2002 onwards. Operation The mixing valve employs a piston to lift and open the steam valve. 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.
Cold water inlet
Steam inlet
Hot water outlet
Range The ½" and ¾" valves are primarily intended for use in hosedown stations, washing down plant e.g. The food and beverage industries. See TI-P157-06 on steam/water mixing stations and TI-P157-05 for the hosedown gun, hose and hose rack. High capacity 1" and 1½" valves are intended for fixed installation i.e. Periodic filling of tanks, therefore no hoses or guns are available. Temperature/pressure ranges All sizes will supply a mixed water temperature in the range of 40 ° to 90 °C. For sizing, see TI-P157-06. The valves are supplied with three fixed loading springs which allows the valve to operate over a wide range of steam pressures. The intermediate spring is fitted as standard.
10.13 1
Sizes and pipe connections ½", ¾", 1" and 1½" screwed BSP (inlet and outlet)
Limiting conditions Body design condition
PN16
Maximum pressure and temperature of inlet steam
10.3 bar g @ 184 °C
Designed for a maximum cold hydraulic test pressure of
24 bar g
TI-P157-08 ST Issue 10
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Steam/Water Mixing Valve - Mk II
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