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Precautions for Installing Trap Valves
Precautions for Installing Trap Valves
2023-09-15

The proper installation of the drain valve has a direct impact on the normal operation of the drain valve and the production efficiency of the equipment. The installation of the drain valve must follow the installation requirements of the drain valve in order to achieve better work efficiency for the drain valve and equipment. 1. Before installing the drain valve, it is necessary to use pressurized steam to purge the pipeline and remove any debris. 2. Before the drain valve, a filter should be installed to ensure that the drain valve is not blocked by pipeline debris, and the filter should be cleaned regularly. 3. Valves should be installed before and after the drain valve to facilitate its maintenance at any time. 4. The direction of condensate flow should be consistent with the arrow mark on the installation of the drain valve. 5. The drain valve should be installed at the lowest point of the equipment outlet to timely discharge condensate and avoid steam resistance in the pipeline. 6. If there is no drain valve installed at the lowest position of the equipment, a backflow bend (condensate lifting joint) should be added at the lowest position of the water outlet to raise the condensate level before installing a drain valve to avoid steam resistance. 7. The outlet pipe of the drain valve should not be immersed in water (if immersed in water, a hole should be drilled at the bend to break the vacuum and prevent sand from being sucked back). 8. Mechanical traps should be installed horizontally, while steam traps should not be installed in series. 9. Each device should be equipped with its own drain valve. 10. Thermostatic type steam traps need to have over one meter of non-insulated supercooled pipes in front of them, while other types of steam traps should be located as close to the equipment as possible. 11. When using a drain valve for drum drying (with siphon type) equipment, please indicate: use a drain valve with an anti-steam resistance device to avoid steam lock on the equipment. 12. If there is condensate recovery after the drain valve, the outlet pipe of the drain valve should be connected to the main pipe from above the recovery main pipe to reduce back pressure and prevent backflow. 13. If there is condensate recovery after the drain valve, pipelines with different pressure levels should be separated for recovery. 14. The condensate recovery main pipe behind the drain valve cannot climb a slope, which will increase the back pressure of the drain valve. 15. A check valve should be installed before the condensate enters the recycling main after the drain valve to prevent the condensate from flowing back. 16. Install a drain valve on the steam pipeline, with a condensate collection well located near the radius of the main pipeline, and then use a small pipe to lead it to the drain valve. 17. If the mechanical drain valve is not used for a long time, it is necessary to remove the drain screw and drain the water inside to prevent freezing. 1...

Brief Discussion on Commonly Used Valves in Heating Engineering
Brief Discussion on Commonly Used Valves in Heating Engineering
2023-09-07

There are many types of valves and their range of use is also wide. If used improperly, there may be "running, emitting, dripping, and leaking" phenomena, with mild cases affecting production and severe cases causing accidents. So understanding and correctly using valves is a very important issue. There are many types of valves used in heating systems. For example, gate valves, globe valves, ball valves, butterfly valves, check valves, safety valves, regulating valves, balance valves, self-operated balance valves, and so on. 1. Gate valve, is a widely used type of valve. The sealing surface of the gate and the valve seat are highly smooth, flat, and consistent, and processed into a very close fitting and tight sealing pair. The gate plate conducts and shuts off the medium through the upward and downward pressure of the valve stem. It plays a shut-off role in the pipeline. 2. Globe valves are also widely used valves. Its working principle is similar to that of a gate valve, except that the closing part (valve disc) moves along the centerline of the valve seat. It plays a shut-off role in the pipeline and can also roughly adjust the flow rate. 3. Compared to gate and globe valves, ball valves are a new type of valve that is gradually being widely adopted. The valve core is a ball with a through cavity, which is controlled by the valve stem to rotate 90 ° to make the valve unobstructed or blocked. It plays a shut-off role in the pipeline. 4. Butterfly valves are currently the most widely used and diverse valve in heating systems. The valve disc is a disc that rotates through the valve stem and rotates at 90 ℃ within the valve seat range to achieve valve opening and closing. It plays a shut-off role in the pipeline. It can also adjust the flow rate. 5. Check valves are also known as single flow valves. It is a commonly used auxiliary valve. It is a valve that automatically opens and closes based on the force of the fluid itself and the weight of the valve disc. As the name suggests, its function is to prevent media backflow. Usually installed at the outlet of the water pump to prevent damage caused by water hammer. 6. The regulating valve is also called a control valve. It is a commonly used valve in the secondary network of heating systems. Its appearance and structure are similar to that of a shut-off valve, but the sealing pair is different. The valve disc and seat of the regulating valve are similar to the cork and mouth of a warm water bottle, and the flow rate is adjusted by changing the flow area through the movement of the valve disc. There is a ruler on the valve shaft indicating the corresponding flow rate. 7. Improved balance valve control valve. The flow channel adopts a direct current type, and the valve seat is changed to polytetrafluoroethylene. It overcomes the disadvantage of large flow resistance, makes the sealing more reasonable, and also has a cut-off function. 8. Self operated balance valve, also known as flow control valve. The...

Elevate Oilfield Efficiency with Numerical Control Multi-Pass Valve
Elevate Oilfield Efficiency with Numerical Control Multi-Pass Valve
2023-09-01

The Numerical Control Multi-Pass Valve plays a crucial role in automating well selection and metering within oilfield metering stations. It replaces multiple metering pipe manifolds and electrically actuated three-way valve assemblies, streamlining well selection. Operated through control system automation or manual actuation, it enables automatic well switching, offering benefits like a compact footprint, streamlined operation, unmanned capability, and simplified installation. It can also be customized for specific needs, making it ideal for modernizing aging oil and gas metering stations on offshore platforms, artificial islands, and remote onshore areas. Features 1. Media Versatility: The valve handles various mediums, including light crude, heavy crude, oil-contaminated water, and clear water. 2. Simplified Operation: Streamlined control through a single multi-pass valve eliminates complex adjustments. 3. Cost-Effective: Fewer control units lead to investment savings of 20% to 30% compared to conventional systems. 4. High Sealing Performance: Self-compensating sealing and snug integration ensure zero leakage, supported by manual adjustments for maintenance. 5. Precision Engineering: Advanced positioning technologies enable near error-free well selection. 6. Durability and Efficiency: The hard-faced alloy sealing surface resists erosion, scaling, and extends service life. 7. Optimal Pressure Management: The system maintains a maximum pressure loss below 0.025 MPa.

butterfly valve is a valve that isolates or regulates the flow of a fluid. The closing mechanism is a disk that rotates. ” Due to its compact structure, short face to face dimension and light weight, butterfly valve is often used in large sizes. In Dervos, we offer concentric butterfly valve, eccentric butterfly valve, high performance butterfly valve, PTFE lined butterfly valve, pneumatic butterfly valve, and motorized butterfly valve.


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