▶ Special Feature 

● Operates hydraulically independent from any external power sources
    and controls high and low levels in a storage tank by utilizing the line
    static and dynamic pressure
● The incorporation of a control shaft in the valve bonnet allows the rate
    of flow through the valve to be set a pre-determined flow and also acts
    as a mechanical shut off feature.
● Closing speed of the valve can be controlled by an integral needle
    valve on the valve bonnet
● The valve is easy to maintain and install due to its simple design 

   Balem 431 is a float operated hydraulic liquid level control valve suitable for tanks and reservoirs. Its working principal is controling flow with a modulating float pilot valve, alternatively a Balem 511 can be adjusted up to 1.2m on/off differential. The body is coated by epoxy to prevent contamination of the liquid, and has excellent thermal resistance. The valve is extremely easy to maintain as no special tools or skills are required.

▶ Specifications 

Model No.

80A(3")

200A(8")

250A(10")

Weight

0.05~0.98 MPa(0.5~10kgf/㎠)

1.72MPa(17.5kgf/㎠)

Temperature  : 0°C ~ 80°C

▶ Dimensions 

▶ Materials 

▶ Flow Chart

▶ Standard Piping Diagram

(Standard Piping Diagram 1) Angle Type, Installed Alone

(Standard Piping Diagram 2) Angle Type, Installed As Safety Valve

(Standard Piping Diagram 3) Globe Type, Installed Alone

▶ Principle of Operation

◆ OPEN
   When the water level in reservoir becomes low, the chamber inside of body becomes in the condition of atmospheric pressure as opening pilot valve, piston moves to upward by the water pressure because the lower area of piston is larger than upper side of disc and disc assembled to piston opens at the same time 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 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.

▶ Applications

● As for Buildings. Apartments. Plants
   - As a replacement for underground/roof top, low water level tanks ball type float control valve.
   - Substitute for high and low levels control mechanical valves and electrodes.
   - Various types of oil tank float control.

▶ Patents

- Korea Patent No. : 0207682
- US Patent No. : 4830042
- Japan Utility Model No. : 2014053

▶ Installation

1. Refer to the standard piping diagram when installing the valve.
2. Before installation, finish to clean pipeline.
3. Only pilot valve made by Balem Co., Ltd may be fitted to this valve.
4. It is recommended that a strainer be installed to prevent the valve malfunctioning due to foreign     particles entering into the system.
5. An alarm receiver system should be installed in the control room for early detection of overflow.
6. If the valve is to be used on high pressure, install a pressure reducing valve and automatic air vent    valve in order to prevent water hammer and noise.
7. Do not fit a butterfly valve directly to the inlet flange.
8. The water level sensor must be placed as following order ;
    - Low water level(pump start)
    - High water level(pump stop)
    - Warning water level(alarm control fail)
    - Emergency stop(closing pilot valve)