Technical Information - Fig. 149

The Type ‘MG’ series or Level or Altitude Control Valves are hydraulically operated, single seated, differential piston actuated and pilot controlled.

Throttling and Non-Throttling versions are available utilising tank head pressure, constant head tubes, level sensors and ball floats to control pilots and actuate the main valve at high water level.

Delayed opening and two -way flow variations can be supplied.

Dimensions (mm)

Valve Size	150	200	250	300	400	450	500	610	750
‘A’	445	610	760	915	1220	1370	1525	1675	2030
‘B’	165	205	230	330	400	430	500	510	610
‘C’	560	690	720	760	1000	900	850	1020	1140
‘D’	200	300	300	400	500	560	600	660	770
‘E’	200	300	300	300	360	400	450	490	620
Mass/kg	120	250	450	700	1350	1700	2100	2700	5000

Specifications

Flanges:	AS 2129 Tables E and F
Working Pressure:	Table E 1400 kPa Table F 2100 kPa
Adjustable Ranges:	2-12, 5-21m head
Temperature Range:	Water 5 - 60°C

Materials

Body and Cover:	Cast Iron AS 1830/T250
Internal Parts:	Bronze AS 1565/836B Grade 316 Stainless Steel
Coatings:	Epoxy Paint Int. & Ext. (0.4mm min. D.F.T.)
Valve Disc and Seals:	Polyurethane, Neoprene
Pilot Valve:	Bronze AS 1565/836B Grade 316 Stainless Steel

The Type ‘MG’ Valves are designed to be installed at ground level and controlled by pilots to perform the required level control function.

The valves are despatched ready for bolting into the pipeline. Sensing or electrical connections are made to the tank, in addition to the normal support foundations to complete the installation.

Variations Available

Throttling or Non-Throttling

One or Two-way Flow

Overriding Solenoid Control

Sustained Pressure Control

Level Sensor Control

Combinations of above

Popular Versions

Fig. No. 149-1 High Water Control	One sensing tube connected to the tank or reservoir, transmits the head pressure to the 3-way adjustable pilot to close at high water level. The main valve remains closed until the level drops about 0.2 metres then opens fully to refill the reservoir.
Fig. No. 149-2 High and Low Water Control	Two head tubes outside the reservoir connected to two pilot valves provide a constant high level and an adjustable low level non-throttling control.
Fig. No. 149-3 Solenoid Control	The 3-way solenoid pilot will provide the level control by fitting one or two level sensors at the required levels in the reservoir.
Fig. No. 149-4 Remote Ball Float	A small ball float pilot installed at high water level will modulate the inflow to maintain a constant level.

Recommended Maximum Flows (l/sec.)

Valve Size (mm)	150	200	250	300	400	450	500	610	750
Normal Max. P/line Vel. 6m/sec.	80	190	300	430	770	970	1190	1720	2730
Occasional Max. P/line Vel. 8m/sec.	110	250	400	570	1020	1300	1590	2290	3640