Combi Valve

Special Features The best for controlling high water level in medium capacity water tank. The valve has excellent service life due to the valve worked by pressure difference and piston style. Opening and closing height of valve is big and it is completely opening and closing style. There is control shaft assembled to control the flow rate of overflow by user. Easy to install as unifying the body and the pilot. Good to use where much flow rate is needed in short time. It is automatic level control valve that doesn't need any power source, however, can control fixed high and low water level. BALEM 421 (Combi Valve) is a buoyancy type of water level control valve which is pilot integrated as one body for supply and controls water levels in a storage tank by utilizing the line static and differential pressure. BALEM 421 Valve has a full mechanical structure, so, it functions by itself without any external power source. It is easy to install due to inner control pipe and integrated pilot. Durability of the valve is excellent and shutting off is stable in high pressure since the valve functions by piston style opening/closing. This valve can get much flow rate of water quickly as it has pilot styled structure using the pressure difference. Specifications BALEM421 Model No. 421-025 421-032 421-040 421-050 421-065 421-080 Size 25A(1") 32A(11/4") 40A(11/2") 50A(2") 65A(21/2") 80A(3") Operating Pressure 0.05~0.98 MPa(0.5~10kgf/㎠) Test Pressure 1.72MPa(17.5kgf/㎠) Media Water, Oil (Order-Made) Temperature : 0°C ~ 80°C End Connections Screwed : KSPT(Standard) / NPT(Optional) Weight 2.5kg 3kg 4.2kg 5.3kg 7kg 10kg Dimensions (mm) Size Model No. H1 H2 H3 L1 L2 W(Ø) 25A 421-025 135 57 53 315 216 124 32A 421-032 152 64 63 336 40A 421-040 169 76 68 351 50A 421-050 181 78 78 358 65A 421-065 214 96 93 393 80A 421-080 224 101 98 411 Materials Item No. Description Materials 1 Body BrC 6 2 Piston Guide C 3771 BE 3 Disk Seal N.B.R 4 Piston C 3771 BE 5 O-Ring N.B.R 6 Mesh STS 304 7 Cap BrC 6 8 Piston Ring PTFE 9 Spring STS 304 10 O-Ring N.B.R 11 Pilot Valve Assy - 12 Floating Ball Assy STS 304 Flow Chart Standard Piping Diagram Principle of Operation Open When the water level in reservoir becomes low, the chamber connecting with pilot valve inside of body becomes in the condition of atmospheric pressure as opening pilot valve. At this time the power which subtracts the weight of piston assembly paying regard to buoyancy and the reaction force of spring from the power which multiply the difference of width(A-B) by the pressure of fluid supply lifts up piston and fluid can flow toward outlet. Close When the water level in reservoir reaches to high water level just, pilot valve will automatically close. In this point, the chamber pressure inside of body is the same with the pressure of inlet by water route through the chamber and the liquid room of inlet, fluid flowing toward outlet will close since disc closes valve seat as moving downward by the weight of piston assembly and the power of spring. At this time, liquid pressure by the area of valve seat is total power of valve closing. Control Shaft Since flow rate out will be adjusted by the cycle height of piston moving, the cycle height of piston can control using control shaft same as the figure and can control flush out pressure and meeting spot condition. Applications As for Buildings. Apartments. Plants - For controlling the water level of water tank at underground/roof top water reservoir. - For controlling the water level of water tank at the elevated water tank. - Substitute for motorized valve with electrode bar for controlling high & low water level. - For controlling the valve control of fuel oil tank. - For controlling the water level of cooling tower. Patents Korea Patents No. 0207682 US Patent No. : 4830042 Japan Utility Model No. : 2014053 Installation Refer to the standard piping diagram when installing the valve. Install near a manhole, install a union for ease of maintenance, repair, and servicing. Before installation, finish to clean pipeline. A receiver alarm system needs to be installed in monitoring room for early detection of malfunction. To prevent waves while filling, an induction tube with syphon braking hole must be installed. The water level sensor must be placed in the following order ; - low water level(pump start) - high water level(pump stop) - warning water level(alarm control fail) - emergency stop(closing pilot valve)

Combi Valve product offered by Balem Co., Ltd.