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Ningbo RMI Plastic Co., Ltd.


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  • PP Butterfly Valve Wafer Type DIN PN10
    PP Butterfly Valve Wafer Type DIN PN10
  • PPH Diaphragm Valve JIS 10K
    PPH Diaphragm Valve JIS 10K
  • PPH Ball Valve Flange End Lever Handle
    PPH Ball Valve Flange End Lever Handle
  • PVC True Union Ball Valve Socket End
    PVC True Union Ball Valve Socket End
  • PVDF Ball Check Valve ANSI
    PVDF Ball Check Valve ANSI
  • PVC Bottom Valve Flange End ANSI CL150
    PVC Bottom Valve Flange End ANSI CL150
  • PVDF Swing Check Valve Flanged PN10
    PVDF Swing Check Valve Flanged PN10
  • Plastic Diaphragm Valve Pneumatic Actuatored
    Plastic Diaphragm Valve Pneumatic Actuatored
  • PVC Vanstone flange PN16
    PVC Vanstone flange PN16
  • Plastic Shell Motorized Actuator Rotary Switch Type
    Plastic Shell Motorized Actuator Rotary Switch Type


Ningbo RMI Plastic Co., Ltd. is a professional manufacturer and exporter of plastic valves and piping materials, provide consult service and supply high quality piping materials for industrial application, water treatment system, irrigation systems, etc. RMI products cover full range of plastic valves, pipes, fittings and accessories by different materials of PVDF, PVC, PVC-C, PP, PP-H, PP-GF, FRP, EPDM, VITON, PTFE. Over 30 kinds different valves include Diaphragm Valve, Ball Valve, Check Valve, Butterfly Valve, Foot Valve, Globe Valve, etc. Size from 1/2" up to 32", following standard of DIN, JIS, ANSI, CNS, ISO. 8 different materials of pipes and fittings diameter from 16mm to 600mm. With high quality products and professional technical support, we serve more than 200 customers in different industries and areas all around the world, and win good reputation. Especially in steel industrial, chloride alkali industry, metallurgical industry, paper making industry, pharmaceutical factory, electroplating factory, mining plant, fish farm, etc. We are continual working for the target of quality improving, technical innovation and service satisfied. Aim to provide customer durable and efficient products to ensure the piping system working safer and longer.
  • 24
    24 H Online Service No Time Difference.
  • 2006
    It is a Chinese brand established in 2006.
  • 5
    Our Factory Have More Than 5 Employees.
  • 5000
    More Than 5000 Square Meters Technical R&D Building.
  • Plastic vertical check valve is selected to prevent medium backflow. The function of plastic check valve is to allow the medium to flow in one direction only and prevent the flow in one direction. Usually, the valve works automatically. Under the action of fluid pressure flowing in one direction, the valve disc opens; when the fluid flows in the opposite direction, the fluid pressure and the self weight of the valve disc act on the valve seat to cut off the flow. Among them, the check valve belongs to this type of valve, which includes swing check valve and lift check valve. The swing check valve has a hinge mechanism, and a disc like a door freely rests on the inclined seat surface. In order to ensure that the valve clack can reach the proper position of the seat surface every time, the valve clack is designed in the hinge mechanism, so that the valve clack has enough swing space, and makes the valve clack truly and comprehensively contact with the seat. The valve flap can be made of all metal, or inlaid with leather, rubber or synthetic coverage on the metal, which depends on the requirements of service performance. When the swing check valve is fully open, the fluid pressure is almost unimpeded, so the pressure drop through the valve is relatively small. The disc seat of the lift check valve is located on the sealing surface of the valve seat on the valve body. Except that the valve disc can be lifted freely, the rest of the valve is like a globe valve. The fluid pressure makes the valve disc lift from the sealing surface of the valve seat, and the backflow of the medium causes the valve disc to fall back to the valve seat and cut off the flow. According to the service conditions, the valve disc can be of all metal structure or inlaid with rubber pad or rubber ring on the valve disc frame. Like the stop valve, the passage of fluid through the lift check valve is narrow, so the pressure drop through the lift check valve
    2020-05 14
  • PVDF material relative density: 1.76. Water absorption: 0.04%. Crystal melting point: 171%. Embrittlement temperature 61 ℃. Specific heat capacity 1170 (J / kg • K). Linear expansion coefficient: 80 × 10K, hot deformation temperature 150 ℃, decomposition temperature 316 ℃, working temperature range - 40-150 ℃, tensile strength 49.2100 ℃, elongation 30-400% Compressive strength 70MPa, impact strength 1.47 × 104kj / ㎡, tensile elasticity scale 840mpa, bending elasticity modulus 1400MPa, compression elasticity modulus 840mpa, hardness 7hb, friction coefficient to steel 0.14, dielectric coefficient 60Hz, power saving 60Hz, volume resistance 2 × 10 Ω• cm, breakdown strength 10kV / m, arc resistance 50-70s, combustion self extinguishing, transparency transparent translucent, good chemical corrosion resistance OK. PVDF, also known as polyvinylidene fluoride, has good chemical stability, excellent chemical resistance, weather resistance and good heat stability, and can be used in the temperature range of - 62 ℃ ~ 150 ℃ for a long time. At the same time, the electrolysis constant is large, which is one of the good insulating materials. It can resist all kinds of salt, acid, alkali, aromatic diameter, halogen and other media except strong alkali amine and strong solvent. It is nonflammable, fatigue resistant, wear-resistant and self-lubricating. Although the raw materials are imported, the price is expensive and the one-time investment is large, but the price is much lower than that of the imported pipes. With its excellent corrosion resistance, unparalleled service life and high safety factor, it will bring you significant comprehensive economic benefits. Introduction to PVDF material of plastic valve pipe: PVDF is short for plastic valve pipe. It is one of the fluorine-containing plastics developed in the 1960s. It is a homopolymer, which uses the action of trifluoroethylene, hydrofluoric acid and zinc pow
    2020-05 11
  • Plastic PVDF valve pipe can be processed by general thermoplastic processing methods, such as extrusion, injection, pouring, molding and transfer molding. 1. Extrusion The melting strength of polymer PVDF is good. It can be molded into film, sheet, tube, rod and power insulating sleeve by extrusion. According to the equipment used and the shape of processed products, the temperature is controlled between 210-290 ℃, and the molding temperature is controlled between 180-240 ℃. The temperature must be strictly controlled so as not to exceed the melting temperature for a long time. Extrusion molding equipment can choose general screw extruder. 2. The PVDF with low molecular weight can be processed by injection molding because of its high melting velocity. Generally, the general injection molding machine is used, but the barrel plunger and nozzle must be made of corrosion-resistant Ni based alloy. 3. Casting and pouring is to use dimethylacetamide as the solvent to prepare PVDF into a solution with solid content of 20%, which is cast on the aluminum foil. After hot melting at 205-315 ℃, the continuous strong and tough film with thickness of 0.05-0.075mm can be made by quenching with water. 4. In general, PVDF particles are put in the oven or preheating furnace for preheating, and the preheating temperature is 215-235 ℃. Then the pre heated materials are added to the pre preheated 180-195 ℃. The pressure is pressed and maintained under 14MPa, and the holding time depends on the time required for melting and flow. The thick wall products can be demoulded only when they are cooled to 90 ℃ to avoid vacuum bubble or deformation. 5. Transfer molding generally uses extruder to plasticize first, and then conveys the material to the storage tank. The material in the storage tank is injected into the mold through the plunger pump, and the material is kept in pressure and cooled. Whether it is mo
    2020-05 11
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