China Stainless Steel No-Return Valve Check Valve 1 2"

Product name spring check valve
Size 1/4"-4"(DN8-DN100)
Material SS304,SS316(CF8,CF8M)
Pressure 1000psi
Suitable medium water, oil, air and some corrosive liquid etc(WOG)
Temperature Range -20-350
Connection F/F threaded
Type of thread NPT,BSPT,BSP,PT,DIN2999 ETC
Sealing PTFE,RPTFE,PPL ETC
Casting Investment
Main usage:
These products mainly used in the field of industrial,we also supply strainer,globe valve,gate valve,ball valve,manhole cover,fittings and so on.
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FAQ:Q1: We are interested in your products?
A1: In order to recommend you suitable products, please provide detail information, like size, material, pressure, model.
Q2: Is the requirement for MOQ?
A2: For some small size, like 1/4''-1''(DN6-DN25), it request the MOQ is 100pcs for each size. Generally speaking, it depends on your order.
Q3: How about the warranty?
A3: The warranty time is 12 months after leaving our factory.
Q:Why choose us ?
A: we are a manufacturer, we have been manufacturing ball valve 15 years .
VALVES COMMON FAULTS AND TREATMENT
Q1. Leakage of valve body:
Reason: 1.The valve body has sand holes or cracks
2.The valve body cracks when rewelding.
Processing: 1.Polish the suspected crack with 4% nitric acid soluation. If there is any crack,it can be shown.
2.Dig and repair cracks.
Q2.Damaged stem and its mating thread,broken stem head and bent stem:
Reason: 1.Improper operation,excessive fore of the switch,malfunction of the limit device and no action of overtorque protection.
2.The thread is too loose or too tight
3.Excessive operation times and long service life
Processing: 1.Improve the operation and do not use too much force; Check the limit device and check the torque protectiong device.
2.Suitable material selection and assembly tolerance meet the requirements
3.Replace spare parts.
Q3.Valve cover joint surface leakage
Reason:1 Insufficient bolt tension or deviation
2 The gasket does not meet the requirements or the gasket is damaged;
3 There are defects in t he binging surface.
Processing:1.Tighten the bolts or make the flange clearance of the cover consistent
2.Replace the gasket
3.Disassemble the sealing cover of the door cover
Q4.Valve leakage
Reason;1.The closure is not strict.
2.Bond surface damage.
3.The clearance between the valve core and stem is too large, causing the valve core to sag or poor contact.
4.Poor sealing materials or stiff valve core.
Processing:1.Improve operation, restart or close.
2.The valve disintegrates and the sealing surface of the valve core and seat is re-ground
3.Adjust the clearance between the valve core and stem or replace the valve dics.
4.The valve disintegrates to eliminate the stickiness.
5.Replace of stack the sealing rings,