Oct.23.2025
A dark rod gate valve has its valve stem nut set on the gate, and the handwheel rotation drives the valve stem to rotate, lifting the gate. However, the valve stem does not move in a straight line.
A gate valve that moves in a straight line with the gate stem is called a bright rod gate valve. This type of gate valve has trapezoidal threads on the rising stem. Through the nut at the top of the valve and the guide groove on the valve body, rotational movement is converted into linear movement, which means converting operational torque into operational thrust.
When opening the gate valve, when the lift of the gate equals 1:1 of the valve diameter, the fluid passage is completely open. However, this position cannot be monitored during operation. In actual use, the valve is considered fully open when the valve stem cannot turn. To account for temperature-induced locking, the valve is usually opened to its highest position and then turned back 1/2 to 1 turn, which serves as the fully open valve position. Therefore, the fully open position of the valve is determined by the position of the gate (i.e., the stroke).
Product Introduction:
The Fleyenda dark rod gate valve body is made of high-grade ductile iron, reducing weight by approximately 20%~30% compared to traditional gate valves, making installation and maintenance convenient. Flat-bottomed seat: Traditional gate valves often accumulate debris like stones, wood, cement, iron filings, and other foreign objects in the concave groove at the bottom of the valve after water flushing, which can cause leakage due to poor closure. The elastic seat seal at the bottom of the gate valve adopts a flat-bottom design similar to that of water pipe machines, which prevents debris accumulation and ensures unobstructed fluid flow.
The gate plate is coated with high-quality rubber both internally and externally using Europe's top rubber vulcanization technology, ensuring precise geometric dimensions after vulcanization. The rubber adheres firmly to the ductile iron gate plate, reducing detachment and maintaining excellent elasticity. The precision-cast valve body does not require any additional finishing to ensure the valve's sealing due to its accurate geometric dimensions.
Product Features:
Flat-bottomed Seat: The bottom adopts a flat-bottom design similar to water pipes, preventing debris accumulation and ensuring reliable sealing.
Integral Rubber Coating: The gate plate is coated entirely with rubber. Its excellent covering performance and precise dimensions ensure reliable sealing and a long lifespan.
Lightweight: The gate plate is made of ductile iron, making it lightweight and easy to install and repair.
Integral Rubber Ring Seal: The valve stem uses an "O"-ring seal, changing from the previous triple "O"-ring seal to a single integral rubber ring. With a copper cap for tightening, it is convenient, quick, adjustable, and easy to replace the rubber ring.
Corrosion Resistance: The inner cavity is coated with non-toxic epoxy resin, preventing corrosion and rust. It can be used for drinking water supply and sewage systems.
The following are pictures of the application of Fleyenda Flow concealed pole soft sealing in the road administration department:
Please feel free to contact us for customized stainless steel soft-sealed dark rod gate valves. Fleyenda offers the sizes you require along with specialized customization services.
