German Roemer valve Roemer model Roemer price

With a constant pressure differential across the Roemer valve, the flow rate of a standard valve changes little when the opening varies over a wide range. However, at a certain opening, the flow rate changes sharply, indicating poor regulation performance. A control valve adjusts the valve core stroke according to the direction and magnitude of the signal, thereby changing the valve's resistance coefficient to achieve flow regulation. Control valves are divided into manual and automatic types, each with various subtypes offering different regulation performances. Automatic control valves include self-acting flow control valves and self-acting differential pressure control valves.

Roemer valve connection method: threaded connection

This is a simple connection method, commonly used for small valves. It falls into two categories: 1) Direct sealing: The internal and external threads provide the sealing action directly. To ensure no leakage at the connection, lead paste, hemp fiber, and PTFE raw tape are often used as fillers; PTFE raw tape is increasingly widely used. This material offers excellent corrosion resistance and superior sealing performance, is easy to use and store, and can be removed intact during disassembly because it is a non-adhesive film, making it far superior to lead paste and hemp fiber. 2) Indirect sealing: The tightening force of the thread is transmitted to the gasket between the two planes, allowing the gasket to provide the sealing action.

Roemer valve sealing requirements

Valve sealing performance refers to the ability of various sealing parts of the valve to prevent medium leakage. It is the most important technical performance indicator of a valve. There are three sealing areas in a valve: the contact area between the two sealing surfaces of the closing member and the valve seat; the mating area between the packing, the valve stem, and the packing box; and the connection area between the valve body and the valve cover. Leakage at the first location is called internal leakage, commonly known as incomplete closure, which affects the valve's ability to cut off the medium. For shut-off valves, internal leakage is not permitted. Leakage at the latter two locations is called external leakage, where the medium leaks from inside the valve to the outside. External leakage causes material loss, environmental pollution, and can even lead to accidents in severe cases. For flammable, explosive, toxic, or radioactive media, external leakage is strictly prohibited; therefore, valves must have reliable sealing performance.

Roemer valve advantages

The electric ball valve structure consists of only a few components, resulting in low material consumption; it features a compact size, light weight, and small installation dimensions. As shown in the electric ball valve structure diagram, it requires low driving torque. As a pressure control valve, it is easy and quick to operate, requiring only a 90° rotation for rapid opening and closing. It also offers good flow regulation efficiency and tight sealing characteristics. In applications involving large to medium diameters and medium to low pressures, the electric ball valve is the dominant valve type. When the electric ball valve is fully open, the disc thickness constitutes the resistance to the medium flowing through the valve body, resulting in a very small pressure drop and thus good flow control characteristics. Electric ball valves come in two sealing types: elastic sealing and metal sealing. For elastic sealing valves, the sealing ring can be embedded in the valve body or attached to the periphery of the disc. Valves with metal sealing generally have a longer service life than those with elastic sealing, but achieving complete sealing is difficult. Metal sealing can withstand higher operating temperatures, whereas elastic sealing has temperature limitations. If an electric ball valve is to be used for flow control, it is important to accurately select the valve size and type. The structural principle of the electric ball valve is particularly suitable for manufacturing large-diameter valves. Electric ball valves are widely used not only in general industries such as petroleum, gas, chemical, and water treatment, but also in cooling water systems of thermal power plants. Common electric ball valves include wafer-type and flanged-type. Wafer-type electric ball valves are connected between two pipe flanges using double-headed bolts, while flanged electric ball valves have flanges on the valve itself, which are bolted to the pipe flanges. Valve strength performance refers to the valve's ability to withstand medium pressure. As a mechanical product subjected to internal pressure, a valve must have sufficient strength and stiffness to ensure long-term use without rupture or deformation. A pneumatic ball valve consists of a ball valve equipped with a pneumatic actuator. Pneumatic actuators are divided into double-acting and single-acting types, controlled by solenoid valves to realize the switching action of the ball valve. Pneumatic ball valves enable intelligent control, allowing rapid opening or closing of pipelines, effectively controlling and managing the pipeline network.

Weidou Intelligent Technology specializes in selling German Roemer valves, Roemer safety valves, Roemer globe valves, Roemer control valves, Roemer solenoid valves, Roemer ball valves, Roemer proportional valves, Roemer diaphragm valves, Roemer butterfly valves, Roemer hydraulic transmission valves, Roemer check valves, Roemer pressure reducing valves, Roemer relief valves, Roemer sequence valves, Roemer balance valves, Roemer throttle valves, and Roemer directional control valves. All products are original imports from Germany. Customers are welcome to inquire and place orders.