ABG-2 Type Bellow Globe Valve

■ Features

● Bellow Globe Valve，its key components metal corrugated pipe，the lower end and valve stem components are automatically rolled and welded, while the upper end and connecting plate are automatically rolled and welded to form a metal barrier between the fluid medium and the atmosphere, ensuring zero leakage of the valve stem.

● The valve disc adopts a conical design, with a streamlined sealing surface and medium, resulting in better sealing performance and longer service life.

● The double sealing design of corrugated pipes with fillers has double safety, making the sealing at the valve stem safer and more reliable, and complying with international sealing standards.

● All corrugated pipes pass the dissipation test; All bellows components and valves have passed standard A-level testing to ensure zero leakage.

● Various valve disc designs can be provided according to working conditions, such as throttle valve disc,control valve disc, flat soft sealing valve disc, stop check valve disc, etc.

The steam pressure reducing valve regulates the flow rate of the medium by controlling the opening and closing parts inside the valve body, thereby reducing the pressure of the medium. At the same time, adjust the opening of the opening and closing parts through the pressure behind the valve to maintain the pressure behind the valve at a certain level. Within this range, when the inlet pressure constantly changes, maintain the outlet pressure within the set range to protect subsequent household and production appliances. Steam pressure reducing valves are generally installed horizontally and controlled by the pressure behind the valve. When the pressure sensor detects an increase in the valve pressure indicator, the valve opening of the pressure reducing valve decreases; When the pressure of the pressure reducing valve is detected, the valve opening of the pressure reducing valve increases to meet the control requirements.

In steam energy-saving technology, high-pressure transportation and low-pressure use are the basic principles.Low pressure use can provide a larger proportion of steam latent heat, reduce the heat contained in the condensate, reduce the amount of secondary steam, and have higher dryness.There are many industries in China that use steam pressure reducing valves, but there are also many problems. For example, some pressure reducing valves only achieve pressure reducing function and cannot stabilize pressure. Some steam pressure reducing valves often have upstream pressure fluctuations or downstream load changes, making it difficult to achieve pressure control. When some pressure reducing valves are unloaded, downstream pressure continues to rise, causing overpressure.

We know that there are many structural types of steam pressure reducing valves. The common ones in the past were diaphragm type and inner spring piston type.The pressure on the lower side of the metal diaphragm of the inner pilot piston pressure reducing valve causes the diaphragm to move up and close the main valve.The pressure on both sides of the piston gradually balances.When the downstream pressure is equal to the set pressure, the main valve finds a position. The position of the main valve has been determined. Adjust to the set pressure.The normal position before starting the external pilot diaphragm steam pressure reducing valve is when the main valve is closed, and the pilot valve is opened by spring force.Steam enters the main diaphragm chamber through the pilot valve, and a portion of the steam flows out from the control hole. The control pressure in the main diaphragm chamber increases.When the main valve is opened, as steam flows through the main valve, downstream pressure increases and is fed back to the lower part of the main diaphragm by the pressure sensing pipe. This force balances the spring force on the upper part of the diaphragm, causing the steam pressure reducing valve to gradually throttle and close, thereby maintaining the pressure in the main valve diaphragm chamber, controlling the opening of the main valve, delivering an appropriate amount of steam, and maintaining downstream pressure stability.

When the downstream pressure of the steam pressure reducing valve increases, the feedback pressure increases, the pilot valve closes, and the control pressure is released from the control hole, making the main valve tightly closed.Any downstream load changes or pressure fluctuations will be fed back to the lower part of the pilot valve diaphragm to adjust the opening of the steam pressure reducing valve and ensure the stability of downstream pressure.

Although these two common steam pressure reducing valves may not be suitable for all working conditions, as long as we choose the pressure reducing valve based on the working conditions and flow rate, we can solve the problem of pressure reducing valves that can only reduce pressure and cannot be stable.