Communicate with Supplier? Supplier
Zheng Mr. Zheng
What can I do for you?
Contact Supplier

Ningbo RMI Plastic Co.,Ltd

CONTACT US

Trade begins with communication.

Hot Products
Product Center
  • 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

ABOUT US

we are 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.
News
  • Diaphragm valve construction and installation precautions and common problems and maintenance methods Diaphragm valve connection type: flange structure or welding is mainly used to cut off or connect the medium in the pipeline, and can also be used for fluid regulation and control. Among them, the hard sealing V-type ball valve has strong shear force between its V-shaped ball core and the metal valve seat of hardfacing alloy, which is especially suitable for medium containing fiber and small solid particles. The multi-way ball valve can not only flexibly control the confluence, shunt and flow direction switching of medium, but also close any channel to connect the other two channels. This kind of valve should be installed horizontally in the pipeline. Ball valve classification: pneumatic ball valve, electric ball valve, manual ball valve. In the strength test, the test pressure is 1.5 times of the nominal pressure, and the duration is not less than 5min. The valve shell and packing are qualified if there is no leakage. During the tightness test, the test pressure shall be 1.1 times of the nominal pressure; the test pressure shall meet the requirements of GB 50243 during the test duration, and the valve disc sealing surface without leakage shall be regarded as qualified. Before the valve is installed, the appearance inspection must be carried out, and the name plate of sanitary ball valve shall comply with the provisions of the current national standard general valve marking (GB 12220). For the valve with working pressure greater than 1.0 MPa and cutting off on the main pipe, strength and tightness test shall be conducted before installation, and the valve can be used only after passing the test. Leakage causes of valve body and valve cover: 1. The casting quality of iron castings is not high, and there are sand holes, loose struc
    2020-10 05
  • Analysis of common problems of pneumatic diaphragm valve 1. Air source system failure 1. Instrument air line is blocked. As the ball valve has throttling effect at the end of the instrument branch air line, the dirt in the air line is easy to accumulate and block. As a result, the instrument air pressure is too low, the control valve can not be fully opened and closed, and even the control valve does not act. 2. Air filter pressure reducing valve failure. The air filter pressure reducing valve has been used for a long time with too much stolen goods, and the air leakage of the pressure reducing valve. The set output pressure of the pressure reducing valve is too low, so that the output air pressure of the instrument is less than the specified pressure. As a result, the regulating valve acts slowly and can not be fully opened or closed or even does not act. 3. Copper pipe connection failure. Due to the aging and air leakage of the copper pipe, the connection of the joint is loose or the copper pipe is blocked by dirt, so that the air pressure of the instrument signal is low, so that the control valve does not act and can not be fully opened and closed, and the valve position in manual state is unstable, resulting in regulation oscillation. 4. Instrument air system failure. The air compressor station is abnormal, the purification air tank of the device is abnormal, the water cut is not timely, the air line is frozen, the instrument air line is leaking or blocked by stolen goods, resulting in the instrument air pressure is too low or even no wind. 5. The valve of instrument air branch line is not opened, which causes the regulating valve not to act. It often occurs during the period of overhaul and start-up after revamping. 2. Power system failure 1. Power
    2020-10 02
  • Main causes of diaphragm valve common faults Diaphragm valve is specially used to control non corrosive or general corrosive medium. The inner surface of valve body is unlined or covered with optional rubber. It is suitable for different working temperature and liquid pipeline. Cause analysis of common faults 1. Diaphragm damage 1. Causes: rubber, fluoroplastic diaphragm aging; prevention and elimination methods: regular replacement; 2. Causes: the operating pressure is too high to crush the diaphragm; prevention and elimination methods: the operation force should be small, pay attention to the closing mark; 3. Causes: foreign matters are embedded between diaphragm and valve seat, pressing or wearing diaphragm; prevention and elimination methods: do not force closing during operation, open and close repeatedly several times up and down, after flushing away foreign matters, formally close the valve; replace the diaphragm timely after damage; 4. Causes: the opening height is too high, breaking the diaphragm; prevention and elimination methods: it is not suitable to open too high during operation. 2. Operation failure 1. Causes: diaphragm and valve disc fall off; prevention and elimination methods: do not open too high, after falling off, repair or replace diaphragm in time; 2. Causes: the connecting pin between the valve stem and the valve disc falls off or is broken due to wear; prevention and elimination methods: it is not allowed to exceed the top dead center when opening, and it should be repaired in time after falling off; 3. Causes: wear and seizure of the connection between the nut of the movable valve rod, the valve cover and the valve stem;
    2020-09 30
Related Products List

Home

Phone

About Us

Inquiry