ZMQSY pneumatic steam trap regulating valve
I. Introduction:
The ZMQSY pneumatic steam trap regulating valve is a new generation of steam trap professionally developed, designed and manufactured by our company based on the steam drainage requirements of thermal power plant equipment. The nearly straight flow path design of the steam trap regulating valve reduces flow resistance, and the secondary throttling principle reduces erosion and extends service life. The valve core and seat of the pneumatic steam trap are made of integral cemented carbide, with internal leakage ≤ Grade VI when closed. The detachable middle cavity sealing design eliminates external leakage and facilitates maintenance. It can also be used in flammable and explosive occasions. According to the signals from the control system or regulating instruments, it can cut off or open the valve, thus meeting the requirements for controlled parameters. Therefore, pneumatic steam trap regulating valves are widely used in remote control of industries such as thermal power plants.
II. Features:
1. The upper part of the steam trap regulating valve consists of a valve cover and a packing box, which facilitates quick disassembly and assembly and on-site maintenance. The inclined valve stem structure and excellent flow channel shape design make the medium flow in a nearly straight path. The valve has an excellent Cv value, producing a lower pressure drop than other types of valves.
2. The valve body is surfaced with cemented carbide sealing surfaces using a special process (the sealing surfaces are integrally hardened), making the structure more compact. The tapered sealing surface design allows sealing with a small axial force, providing reliable sealing and long service life.
3. The disc guided by the valve body middle cavity has two guide rings, one above and one below. The top and bottom of the disc are guided simultaneously, forming a piston-type disc guided throughout the valve body middle cavity, which can eliminate phenomena such as jamming, surface scratches, valve stem bending, and disc vibration caused by improper forces. The guide ring at the bottom of the disc allows 90% of the fluid to pass in a nearly straight path, effectively eliminating adverse effects caused by all side impacts. These features make this valve highly suitable for rapid "discharge" and "steam drainage" systems of power station steam.
4. The sealing surface of the disc is surfaced with cemented carbide, which has excellent mechanical properties, wear resistance, and erosion resistance, ensuring the valve's long service life.
5. The valve stem packing adopts imported special packing, which provides excellent sealing effect, is durable, and easy to disassemble and assemble. The seal between the packing box and the valve body uses a flexible graphite gasket with 316 stainless steel wire mesh, assembled at a predetermined torque, ensuring safety and reliability and eliminating external leakage.
6. A pneumatic device is used as the actuator, providing precise, safe, and effective valve control.
7. The packing box adopts a special structural design to ensure sufficient strength and good thermal characteristics.
III. Application:
Designed and manufactured specifically for steam systems of thermal power units, it is widely used in 125MW—1000MW thermal power units. Its function is to discharge boiler steam to a dedicated container through the steam trap during unit start-up, shutdown, or in case of accidents when the steam turbine unit does not require steam, ensuring safe operation of the unit. During normal unit operation, the steam trap is closed, requiring zero leakage; otherwise, it will cause energy waste. During unit start-up, shutdown, or accidents, it must open accurately and reliably to effectively discharge the specified amount of steam, ensuring normal operation.
IV. Part Materials:
Part Name | Material | ||
Valve Body | 25+Slite21 | 12Cr1MoV+Slite21 | 0Cr17Ni12Mo2+Slite21 |
Disc | 25+Slite21 | 12Cr1MoV+Slite21 | Slite21 |
Valve Stem | 1Cr13 | 25Cr2Mo1V | 0Cr17Ni4Cu4Nb |
Packing Box | 25 | 12Cr1MoV | 0Cr17Ni12Mo2 |
Clamp Plate | 1Cr13 | 1Cr13 | 0Cr17Ni12Mo2 |
Packing | Flexible graphite with stainless steel wire braid | Flexible graphite with stainless steel wire braid | Flexible graphite with stainless steel wire braid |
Packing Gasket | 1Cr13 | 1Cr13 | 0Cr17Ni12Mo2 |
Seal Gasket | High-mesh flexible graphite with 316 wire | High-mesh flexible graphite with 316 wire | High-mesh flexible graphite with 316 wire |
V. Technical Parameters:
Nominal Diameter DN | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 100 | ||
Flow Coefficient | 5 | 8 | 12 | 17 | 29 | 43 | 70 | 100 | ||
Rated Stroke | 16 | 25 | 40 | |||||||
Effective Diaphragm Area | 280 | 400 | 600 | |||||||
Nominal Pressure | 150LB (2.0MPa) -- 1500LB (25.0MPa) | |||||||||
Working Temperature | -445 | |||||||||
Connection Thread | M10X1 | M16X1.5 | ||||||||
| Machinery & Equipment/Valves/Control Valves | |
