A ball check valve is a check valve in which the closing member, the movable part to block the flow, is a spherical ball. In some ball check Valves, the ball is spring-loaded to help keep it shut. For those designs without a spring, reverse flow is required to move the ball toward the seat and create a seal. The interior surface of the main seats of ball check valves are more or less conically-tapered to guide the ball into the seat and form a positive seal when stopping reverse flow. Check Valves, Water Check Valves, Brass Check Valves, Sanitary Check Valves ZHEJIANG KINGSIR VALVE CO., LTD. , https://www.kingsirvalves.com
Standard
ASTM, JIS, DIN EN, GB
Grade
201, 202, 301, 302, 304, 304L, 316, 316L, 310S, 310,405, 409, 430, 410, 420, 440A, etc.
Certificate
ISO, SGS ,CE or other third party inspection acceptable.
Outer Diameter
1) Round pipe: 8mm to 680 mm
2) Square pipe: 10x10mm to 300x300mm
3) Rectangular pipe: 10x20mm to 120x180mm
Thickness
0.5mm-100mm
Surface
Hot Rolled: No.1
Type
Seamless, Welded, Decoration, Sanitary, Precision, Capillary pipe/tube
Shape
Round, Square, Rectangular, Slot, Oval, etc
Length
6m or as customer's request
Surface
180G, 320G, 400G Satin /Â Hairline
400G, 500G, 600G or 800G Mirror finish,HL,8K,etc
Trade terms
Ex-Work, FOB/CFR/CIF
Payment terms
T/T, L/C at sight, Western Union, etc.
Delivery Time
15-20 days after receive the deposit.
Packing
standard export package or as required.
Port of shipment
Tianjin, Shanghai or as required.
Advantage
Small MOQ +Â Superior quality +Â Competitive price +Â Fast delivery
Chemical Composition
Â
Â
Chemical  Composition (%)
C
Si
Mn
P
S
Ni
Cr
Mo
Cu
N
Other
1Cr17Mn6Ni5N
201
0.15
1.00
5.50--7.50
0.050
0.03
3.50-5.50
16.00-18.00
-
-
0.05-0.25
-
0Cr18Ni9
304
0.08
1.00
2.00
0.045
0.03
8.00-11.00
18.00-20.00
-
-
-
-
00Cr19Ni10
304L
0.03
1.00
2.00
0.045
0.03
8.00-12.00
18.00-20.00
-
-
-
-
2Cr25Ni20
310
0.25
1.50
2.00
0.040
0.03
19.00-22.00
24.00-26.00
-
-
Â
-
0Cr25Ni20
310S
0.08
1.50
2.00
0.045
0.03
19.00-22.00
24.00-26.00
-
-
Â
-
0Cr17Ni12Mo2
316
0.08
1.00
2.00
0.045
0.03
10.00-14.00
16.00-18.00
2.00-3.00
-
Â
-
00Cr17Ni14Mo2
316L
0.03
1.00
2.00
0.045
0.03
10.00-14.00
16.00-18.00
2.00-3.00
-
Â
-
0Cr18Ni10Ti
321
0.08
1.00
2.00
0.045
0.03
9.00-12.00
17.00-19.00
-
-
-
Ti 5C-0.70
1Cr17
430
0.12
1.00
1.00
0.040
0.03
(0.06)
16.00-18.00
Â
-
Â
-
Mechanical Property
ASTM
TS(MPa)≥
YS(MPa)≥
EL(%)≥
Hardness
HB
HRC
201
520
275
40
241
100
304
520
205
40
187
90
304L
480
175
40
187
90
310
520
205
40
187
90
310S
520
205
40
187
90
316
520
205
40
187
90
316L
480
175
40
187
90
321
520
205
40
187
90
430
450
205
22
183
88
Products Show
Our Factory
Our Certificate
Packing &Â Delivery
Customer Photos
FAQ
Q: What do you sell?
A:Almost all kinds of steel product, like the stainless steel pipe, steel plate, coil, rod, angle steel and pipeline tube, oil casing tube.
Q: How long is your delivery time?
A: Generally it is 5-10 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to quantity.
Q: Do you provide samples ? is it free or extra ?
A: Yes, we could offer the sample for free charge but do not pay the cost of freight.
Q: Why Choose us?
A: 1.Focus on stainless steel industry;
  2.Products are all made of steel plate(Tisco, Lisco, Baosteel Posco), have large stocks;
  3.Expert sales teams with 7 X 24 hour service;
  4.ISO,CE,SGS certificate passed company.
Contact Us
http://www.xhsstainless.net
Â
Â
Tel: +86 13227812296
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Ball check valves are often very small, simple, and cheap. They are commonly used in liquid or gel minipump dispenser spigots, spray devices, some rubber bulbs for pumping air, etc., manual air pumps and some other pumps, and refillable dispensing syringes. Although the balls are most often made of metal, they can be made of other materials, or in some specialized cases out of artificial ruby. High pressure HPLC pumps and similar applications commonly use small inlet and outlet ball check valves with both balls and seats made of artificial ruby, for both hardness and chemical resistance. After prolonged use, such check valves can eventually wear out or the seat can develop a crack, requiring replacement. Therefore, such valves are made to be replaceable, sometimes placed in a small plastic body tightly-fitted inside a metal fitting which can withstand high pressure and which is screwed into the pump head.
There are similar check valves where the disc is not a ball, but some other shape, such as a poppet energized by a spring. Ball check valves should not be confused with Ball Valves, which is a different type of valve in which a ball acts as a controllable rotor to stop or direct flow.
A diaphragm check valve uses a flexing rubber diaphragm positioned to create a normally-closed valve. Pressure on the upstream side must be greater than the pressure on the downstream side by a certain amount, known as the pressure differential, for the check valve to open allowing flow. Once positive pressure stops, the diaphragm automatically flexes back to its original closed position.
A swing check valve or tilting disc check valve is check valve in which the disc, the movable part to block the flow, swings on a hinge or trunnion, either onto the seat to block reverse flow or off the seat to allow forward flow. The seat opening cross-section may be perpendicular to the centerline between the two ports or at an angle. Although swing check valves can come in various sizes, large check valves are often swing check valves. The flapper valve in a flush-toilet mechanism is an example of this type of valve. Tank pressure holding it closed is overcome by manual lift of the flapper. It then remains open until the tank Drains and the flapper falls due to gravity. Another variation of this mechanism is the clapper valve, used in applications such firefighting and fire life safety systems. A hinged gate only remains open in the inflowing direction. The clapper valve often also has a spring that keeps the gate shut when there is no forward pressure. Another example is the backwater valve (for sanitary drainage system) that protects against flooding caused by return flow of sewage waters. Such risk occurs most often in sanitary drainage systems connected to combined sewerage systems and in rainwater drainage systems. It may be caused by intense rainfall, thaw or flood.
A stop-check valve is a check valve with override control to stop flow regardless of flow direction or pressure. In addition to closing in response to backflow or insufficient forward pressure (normal check-valve behavior), it can also be deliberately shut by an external mechanism, thereby preventing any flow regardless of forward pressure.
A lift-check valve is a check valve in which the disc, sometimes called a lift, can be lifted up off its seat by higher pressure of inlet or upstream fluid to allow flow to the outlet or downstream side. A guide keeps motion of the disc on a vertical line, so the valve can later reseat properly. When the pressure is no longer higher, gravity or higher downstream pressure will cause the disc to lower onto its seat, shutting the valve to stop reverse flow.
An in-line check valve is a check valve similar to the lift check valve. However, this valve generally has a spring that will 'lift' when there is pressure on the upstream side of the valve. The pressure needed on the upstream side of the valve to overcome the spring tension is called the 'cracking pressure'. When the pressure going through the valve goes below the cracking pressure, the spring will close the valve to prevent back-flow in the process.
A duckbill valve is a check valve in which flow proceeds through a soft tube that protrudes into the downstream side. Back-pressure collapses this tube, cutting off flow.
A pneumatic non-return valve.
Multiple check valves can be connected in series. For example, a double check valve is often used as a backflow prevention device to keep potentially contaminated water from siphoning back into municipal water supply lines. There are also double ball check valves in which there are two ball/seat combinations sequentially in the same body to ensure positive leak-tight shutoff when blocking reverse flow; and piston check valves, wafer check valves, and ball-and-cone check valves.
Grade: 201, 202, 301, 302, 304, 304L, 316, 316L, 310S, 31
Certificate: ISO, SGS, Ce or Other Third Party Inspection Accep
Thickness: 0.8mm-14mm
Outer Diameter: 15*15mm-300*300mm
Surface: No.1, 2b, Ba, Hair Line, Mirror (8K), No.4
Trade Terms: Ex-Work, Fob/CFR/CIF
Advantage: Small MOQ + Superior Quality + Competitive Price +
Trademark: XHS
Transport Package: Standard Export Package or as Required
Origin: China