anti-scour stop valve
Product Parameters
I. Application of Anti-scour Globe Valves:
Anti-scour globe valves are installed on pipelines and containers such as steam turbine drains, feedwater drains, heater drains, boiler drains, superheater drains, atmospheric exhaust, water wall lower header blowdown, and wall package drains, serving as opening and closing devices. This series of valves changes the structural form of traditional globe valves and adopts a high-pressure differential throttling sleeve structure. It has the characteristics of strong scouring resistance, easy operation, long service life, detachable internal parts, and low maintenance cost.
II. Structure of Anti-scour Globe Valves:
1. The valve adopts a straight-through structure.
2. To avoid high-speed scouring of the sealing pair by the medium during use, the sealing adopts a double-seat structure, which first throttles and blocks impurities, then uses the throttled medium to self-clean the sealing surface, thus completely solving the problems of valve leakage and short service life caused by dirty medium pressing on the valve seat sealing surface when the valve is closed.
3. For anti-scour globe valves with nominal diameter DN≤50mm, the connection between the valve body and the valve cover is a clamp pin shaft type connection; for DN65 and above, the connection between the valve body and the valve cover adopts a self-sealing flange connection. Both structures are convenient to disassemble and assemble, safe and reliable.
4. The branch pipes at both ends of the valve are welded connections.
5. The sealing surfaces of the valve seat and valve disc are both surfaced with imported cobalt-based hard alloy. The sealing surface has the characteristics of high hardness, wear resistance, and scratch resistance.
6. Nitrided steel is used as the valve stem material, so that the surface of the nitrided valve stem has high hardness, wear resistance, scratch resistance, and also has the characteristics of corrosion resistance and long service life.
III. Basic Parameters of Anti-scour Globe Valves:
Nominal Diameter: DN10-100mm
Nominal Pressure: PN10-42.0MPa
Applicable Medium: Steam, water and corrosive media
Medium Temperature: -50℃~700℃
IV. Materials of Anti-scour Globe Valves
Valve Body: 20G forged steel, ZG250 forged steel, 12Cr1MoV, F22 alloy steel forging
Valve Disc and Valve Seat Sealing Surface: Surfaced with cobalt-based alloy
Valve Stem: Precipitation hardening stainless steel
Throttling Sleeve: Hard nitriding treatment
V. Characteristics of Anti-scour Globe Valves:
1. High-quality forged valve body after solution treatment ensures no internal or external cracks. The forgings comply with the provisions of JB9626-1999.
2. The valve seat is surfaced with cobalt-based hard alloy, which greatly improves high-temperature hardness and medium scouring resistance.
3. The valve disc adopts imported cobalt-chromium-tungsten steel balls, which have high high-temperature hardness, making their medium scouring resistance much better than that of ordinary needle valves.
4. The forged valve stem has exceptional flexibility and strength. The thread processed by rolling is located above the packing, avoiding contact with the medium. The polished smooth rod part not only closely contacts the packing to ensure no external leakage, but also reduces the opening torque, making the valve open and close flexibly.
5. The uniquely designed medium metal gasket undergoes special process quenching and tempering treatment, ensuring good sealing under high temperature and high pressure.
6. Flexible graphite packing with excellent compactness ensures no external leakage under high temperature and high pressure.
| Machinery & Equipment/Valves/Globe Valves | |
