Pneumatic concealed stem knife gate valve DMZ673H
I. Introduction:
The DMZ673H pneumatic dark stem gate valve has the advantages of short structural length, light weight, the seat sealing surface being protected from medium erosion, uniform pressure on the sealing surface, tight fit, ability to scrape off dust particles, tar, etc. from the seat sealing surface during the closing process, convenient sewage discharge, and prevention of medium leakage. It is suitable for use in gas pipelines containing dust or tar. The DMZ673H pneumatic dark stem gate valve is a relatively complex automatic control instrument, composed of various pneumatic components and a valve body. It is mostly used in occasions requiring rapid opening or closing. Double-acting: Two-position control for valve opening and closing; Single-acting (spring return): The valve automatically opens or closes when the electrical or pneumatic circuit is cut off or malfunctions.
II. Features:
1. The knife gate valve is a new type of gate valve, with small volume, light weight, light weight and material saving. It is an ideal product in industries such as sewage, coal slurry, mud, air, slag-water mixture, water supply, papermaking, and mining.
2. The knife gate valve adopts metal-to-metal hard seal or metal-to-rubber soft seal. During the opening and closing process, the gate plate and sealing surface adopt a special design, which reduces friction and ensures durability.
3. The upper seal of the knife gate valve breaks through the conventional sealing form. The cover structure is adopted, which changes the upper seal from a large-area rectangular seal to a small-area circumferential seal, greatly improving the sealing performance. Based on the circumferential seal, the internationally advanced floating seal structure is also adopted, making the upper seal reach the same service life as the pipeline, thereby improving the overall service life of the valve.
4. After adding a sealing sleeve device to the top of the handwheel of the knife gate valve, all moving parts of the valve can be in a closed state, and the screw drive between the gate plate and the valve stem will not jam due to dry lubricating oil. It is especially suitable for long-term normal operation in harsh environments with dust and dryness.
III. Application Scope:
Mining, iron and steel industry – used for coal slurry, filter slag slurry, etc.
Purification equipment – used for wastewater, mud, dirt, and clarified water with suspended solids.
Papermaking industry – used for pulp and water mixtures of any concentration.
Sugar industry – used for beet washing, syrup, juice extraction, fruit juice, etc.
Food industry – used for washing and flushing equipment, grain conveying equipment, malt slurry, etc.
Power station ash removal – used for ash slag slurry.
IV. Technical Parameters:
Nominal Pressure |
PN |
Shell Test |
1.5 Mpa |
Seal Test |
1.1 Mpa |
Working Temperature |
Rubber ≤80℃; PTFE seal ≤180℃; Hard seal ≤425℃ |
Applicable Medium |
Syrup, pulp, sewage, coal slurry, ash, slag-water mixture |
| Machinery & Equipment/Valves/Gate Valves | |
