German PRE-VENT valves PRE-VENT models PRE-VENT prices

PRE-VENT valves are piping accessories used to open and close pipelines, control flow direction, and regulate and control the parameters of the conveyed medium (temperature, pressure, and flow rate). Based on their function, they can be classified as shut-off valves, check valves, control valves, etc. Valves are control components in fluid transport systems, featuring functions such as cut-off, regulation, flow guidance, backflow prevention, pressure stabilization, flow diversion, or overflow pressure relief. Valves used in fluid control systems range from the simplest globe valves to various valves used in highly complex automatic control systems, with a wide variety of types and specifications. Valves can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, slurry, oil products, liquid metals, and radioactive media. Based on material, valves are also classified into cast iron valves, cast steel valves, stainless steel valves (201, 304, 316, etc.), chrome-molybdenum steel valves, chrome-molybdenum-vanadium steel valves, duplex steel valves, plastic valves, and non-standard custom valves.

PRE-VENT valve connection method: ferrule connection

Ferrule connection: its connection and sealing principle is that when the nut is tightened, the ferrule is subjected to pressure, causing its cutting edge to bite into the outer wall of the pipe, while the outer conical surface of the ferrule fits tightly with the inner conical surface of the fitting body under pressure, thus reliably preventing leakage. Advantages of this connection type include: 1) Small size, light weight, simple structure, easy assembly and disassembly; 2) Strong connection, wide application range, resistant to high pressure (1000 kg/cm²), high temperature (650 °C), and impact vibration 3) Various materials can be selected, suitable for corrosion resistance; 4) Low machining precision requirements; convenient for high-altitude installation. The ferrule connection type has been adopted in certain small-diameter valve products in China.

PRE-VENT valve installation precautions

1) Before installing the valve, carefully verify whether the model and specifications of the valve used match the design; 2) Check against the valve model and factory manual to determine if the valve can be applied under the required conditions; 3) When lifting the valve, ropes should be tied at the flange connection between the valve body and bonnet; do not tie them to the handwheel or valve stem to avoid damaging the valve stem and handwheel; 4) When installing valves on horizontal pipelines, the valve stem should be vertically upward; downward installation of the valve stem is not permitted; 5) When installing valves, do not use forced alignment by pulling or dragging, to avoid damage caused by uneven stress; 6) Rising stem gate valves should not be installed in underground damp locations to prevent corrosion of the valve stem.

PRE-VENT valve usage precautions

For valves in operation, all valve components should be complete and intact. Bolts on flanges and supports must not be missing, threads should be undamaged, and loosening is not permitted. If the locking nuts on the handwheel are found loose, they should be tightened promptly to avoid wear at the connection point or loss of the handwheel and nameplate. If the handwheel is lost, it must not be replaced with an adjustable wrench; it should be replaced promptly. The packing gland must not be skewed or lack pre-tightening clearance. For valves in environments prone to contamination by rain, snow, dust, sand, etc., protective covers should be installed on the valve stems. Scales on valves should remain complete, accurate, and clear. Lead seals, caps, pneumatic accessories, etc., on valves should be complete and intact. Insulation jackets should have no dents or cracks. Striking, standing on, or supporting heavy loads on valves in operation is not permitted; this is especially prohibited for non-metallic valves and cast iron valves.

Weidou Intelligent Technology specializes in selling German PRE-VENT valves, PRE-VENT safety valves, PRE-VENT globe valves, PRE-VENT control valves, PRE-VENT solenoid valves, PRE-VENT ball valves, PRE-VENT proportional valves, PRE-VENT diaphragm valves, PRE-VENT butterfly valves, PRE-VENT hydraulic actuated valves, PRE-VENT check valves, PRE-VENT pressure reducing valves, PRE-VENT relief valves, PRE-VENT sequence valves, PRE-VENT balance valves, PRE-VENT throttle valves, PRE-VENT directional control valves, original German imports. Welcome customers to inquire and order.