in: Auto parts, Bicycle parts, Valves,
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File:SchraderValve.jpgA Schrader valve (with cap) on a bicycle tire
File:Schrader valve tall.jpgUnusually tall Schrader valve
File:Schrader valve opening and closing on a tire.gifA simplified Schrader valve that opens and closes to let air out of a tire
The Schrader valve (also called American valve)[1] invented by August Schrader in 1891[2] consists of a valve stem into which a valve core is threaded, and is used on virtually all automobile tires and most wider rimmed bicycle tires. The valve core is a poppet valve assisted by a spring.
In addition to tube and tubeless tires, Schrader valves of varying diameters are used on many refrigeration and air conditioning systems to allow servicing, including recharging with refrigerant; by plumbers conducting leak-down pressure tests on pipe installations; on the fuel rail of some direct fuel injection engines; and on the buoyancy compensator hose of SCUBA regulator systems, allowing the user to remove and attach the hose while in use.
A Schrader valve consists of an externally threaded hollow cylindrical metal tube, typically of brass. In the center of the exterior end is a metal pin pointing along the axis of the tube; the pin's end is approximately flush with the end of the valve body.
Generally, all Schrader valves used on tires have threads and bodies of a single standard size at the exterior end, so caps and tools generally are universal for the valves on all common applications.
A new development is Schrader valve stems with integrated transmitters for tire pressure monitoring systems (TPMS).
A valve cap is important on a Schrader valve because if one is not fitted, dirt and water can enter the outside of the valve, potentially jamming it or contaminating the sealing surfaces and causing a leak. Rock salt and other chemical deicers used in the winter are especially damaging for the brass components in the Schrader valve.
Metal valve caps usually have, in addition to a handy deflating tool, a small rubber insert to permit a good seal against the valve body; a cap of this kind also helps to prevent air escaping from a slightly leaking valve.
However, the vast majority of Schrader valves used for tires are fitted with plain black plastic caps which effectively serve only to keep contaminants out of the valve stem.
There are also special pressure monitoring valve caps available that use a spring loaded piston to raise a green flag when the pressure is at or above the correct setting. Upon losing pressure the green flag is retracted to reveal a red pin, hopefully catching the attention of the owner before fuel is wasted by running the tire under-inflated.
Recently, colored plastic valve stem caps have appeared. Certain automobile tire dealerships are promoting the use of dry nitrogen to inflate tires. Dealers claim that eliminating oxygen and water will prolong the life of both tires and wheels. These dealers install green caps to signify that the tires are filled with nearly pure (typically about 95%) nitrogen.
Other vendors are selling caps in a variety of other colors for purely decorative purposes.
The decorative category even includes caps that light up when the wheels move.
Presta and Schrader valves are both good at sealing high pressures. Their chief differences are that Schrader valves are larger and have springs that close the valve except when the pin is depressed. Schrader valves are used in a wide variety of compressed gas and compressed liquid applications. Presta valves are used only for bicycle tires.
Compared to Presta valves, Schrader valves used for bicycle tires have a greater diameter, requiring a larger diameter hole in a bicycle rim. While not a concern on wider bike rims, it will weaken a narrow wheel rim, precluding their use on racing bicycles. Another disadvantage of the Schrader is that the air chuck must depress the spring-loaded pin before air can flow during inflation, whereas the Presta valve relies solely on internal air pressure to keep it shut. This means that some air is lost while attaching and detaching pumps to Schrader valves.
A rim drilled for Presta valves may be converted to accept Schraders by drilling with a 21/64" bit, but care must be taken to de-burr the resulting hole to prevent damage to the tire and innertube.
Screw-on adapters are available at bike shops to give a Presta valve the diameter required for using standard air fittings.
Schrader valves are classified by their material, diameter of intended rim hole, length, and shape.
The standard Schrader valve has the following threads:
External thread
302 in x 32 tpi (threads per inch)Internal thread (to accept the threaded valve core)
For refrigeration, a 1/4" male flare fitting is used, with the same internal thread as above.
nl:Fietsventiel de:Schrader-Ventil pl:Zawór Schradera
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The bike is teeming with threads. Spokes, axles, bottom bracket bearings, valves are only a few of the components on a bicycle in which threads are used. In this blog post you can read about the most common types of bicycle threads and their applications.
In the course of the development of the bicycle, several standards for these components have been established. Since bicycles are manufactured all over the world, the assignment of a thread depends not only on the respective component, but especially on the origin of the bicycle. Italian bicycle manufacturers, for example, also use Italian standard threads. Although these are relatively identical to common component manufacturers, they have a flank angle of 55°. DIN threads, on the other hand, have a flank angle of 60°.
Thus, if the flank angle is incorrectly used in the cutting insert, the thread can be destroyed. It is therefore advisable to determine the thread correctly before cutting/retapping a thread.
You can find more about Italian, French and English bicycle threads in this article:
the bicycle thread (FG) DIN 79012The bicycle thread is a relatively fine thread, which is however not called fine thread in its definition. The number of turns per inch for the bicycle thread lies between the standardised coarse and fine thread according to DIN 13.
Due to the British-American origin of this standard, the dimensions of the respective thread sizes are also not clearly stated in mm. The designation FG 2, for example, indicates that this size is the nominal diameter 2 mm. In fact, however, FG 2 means that it is a nominal diameter of 2.096 mm.
The origin of this standard becomes even clearer when the lead for the thread dimension FG 2 is indicated:
FG 2-56(56 threads per inch /2.54 cm)
This is because, unlike metric threads, the pitch here is given in threads per inch.
Technical table: bicycle thread (Fg) according to DIN 79012
the valve thread: VG DIN 7756For the bicycle there are – roughly differentiated – the following common valve threads. In the following we present the Dunlop valve, Sclaverand valve and Schrader valve.
The inventor was John Boyd Dunlop, who also gave his name to the well-known tyre brand. The Dunlop valve is the most common valve in Germany, Austria and the Netherlands. It is mainly used for touring and city bikes.
It is available in two versions:
On the one hand the older version with a rubber tube to pump in the air, which however involves a lot of effort when pumping, and on the other hand the version that is common today, where the valve involves a ball or a cylinder. This newer automatic variant is also called the flash valve.
The rim bore for the use of this valve must be 8.5 mm and is designed for a maximum pressure of 6 bar.
The Sclaverand valve is also known as the French valve.
It is used with a rim bore of 6.5 mm and withstands a pressure of 15 bar. This is why these valves are mainly used in very thin tires, such as on racing bikes. The Italian designation of this valve type is “Presta”.
Like the Dunlop valve, the Schrader valve requires a rim hole of 8.5mm and can withstand a pressure of up to 6 bar.
This valve is used more and more today, as tyre widths have increased considerably in recent decades with the introduction of mountain bikes and trekking bikes.
The external thread of the Schrader valve measures 7.7 mm (0.302 inch) x 32 gears (VG 8).
The decisive advantage of this valve type is that it can be filled with air at any filling station.
The most common valve threads are:
The value refers to the outer diameter of the valve.
the metric thread DIN 352 (standard thread) or DIN 2181 (fine thread)Smaller metric or metric-fine threads are mainly used for the following components on the bicycle:
Larger metric threads are intended for heavy-duty components:
For the exact determination of the thread we have created a general step-by-step guide:
In our download area we have compiled a PDF with technical data about bicycle threads (axles, steerer tube, spokes, bottom bracket and pedals).
Values such as the thread diameter, the core diameter, the pitch as well as the designations help you to determine the thread.
Click here for a free download.
| Attribute | Meaning |
|---|---|
| Housing material | Stainless steel 316 |
| Cleaning procedure | Standard Cleaning and Packaging Instruction (SC-10) |
| Connection size 1 | 1/4" |
| Connection type 1 | Out. thread NPT |
| Connection size 2 | 1/4" |
| Connection type 2 | Int. thread NPT |
| Maximum flow coefficient (Cv) | 0.21 |
| ECLASS (4.1) | 37010201 |
| ECLASS (5.1.4) | 37010201 |
| ECLASS (6.0) | 37010203 |
| ECLASS (6.1) | 37010203 |
| Flow pattern | Straight (2-way) |
| Handle type | Longitudinal, stainless steel |
| Low emission certified | Yes |
| Maximum temperature, °F (°C) | 600 (315) |
| Pressure ratings at max. temperature | 600°F @ 3130 psi inch man. / 315 °C at 215 bar |
| Minimum temperature, °F (°C) | -65 (-53) |
| Orifice, | 0. 125 in./ 3.2 mm |
| Pressure ratings at room temperature | 6000 psi inch man. at 100°F / 413 bar at 37°C |
| Stem Tip Material | Stainless steel 316 |
| Stem type | Con. |
| UNSPSC (10.0) | 40141602 |
| UNSPSC (11.0501) | 40141602 |
| UNSPSC (13.0601) | 40141602 |
| UNSPSC (15.1) | 40141602 |
| UNSPSC (17.1001) | 40141600 |
| UNSPSC (4.03) | 40141602 |
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CAD Disclaimer: This template has been prepared for informational purposes. Template dimensions are for reference only and are subject to change. See Swagelok product catalogs for more information.
The reader should consult a qualified engineer before using the pattern in whole or in part.
2D
2D models are available for this product. Download CAD file.
3D
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Sales drawing
Sales drawings are available for this product. Download files.
| Product code | Body material | Connection size 1 | Connection type 1 | Connection size 2 | Connection type 2 | |
|---|---|---|---|---|---|---|
| B-1VF4 | Brass | 1/4" | Int. thread NPT | 1/4" | Int. thread NPT | Product View |
| B-1VM4 | Brass | 1/4" | Out. thread NPT | 1/4" | Out. thread NPT | Product View |
| B-1VS4 | Brass | 1/4" | Swagelok® tube fitting | 1/4" | Swagelok® tube fitting | Product View |
| B-1VS6 | Brass | 3/8" | Swagelok® 9 tube fitting0017 | 3/8" | Swagelok® tube fitting | Product View |
| B-1VS8 | Brass | 1/2" | Swagelok® tube fitting | 1/2" | Swagelok® tube fitting | Product View |
| M-1VS8 | Alloy 400 | 1/2" | Swagelok® tube fitting | 1/2" | Swagelok® tube fitting | Product View |
| SS-18VS12 | Stainless steel 316 | 3/4" | Swagelok® tube fitting | 3/4" | Swagelok® tube fitting | Product View |
| SS-1VF4 | Stainless steel 316 | 1/4" | Int. thread NPT | 1/4" | Int. thread NPT | Product View |
| SS-1VM4 | Stainless steel 316 | 1/4" | Out. thread NPT | 1/4" | Out. thread NPT | Product View |
| SS-1VM4-S4 | Stainless steel 316 | 1/4" | Out. thread NPT | 1/4" | Swagelok® tube fitting | Product View |
| SS-1VS12MM | Stainless steel 316 | 12 mm | Swagelok® tube fitting | 12 mm | Swagelok® tube fitting | Product View |
| SS-1VS4 | Stainless steel 316 | 1/4" | Swagelok® tube fitting | 1/4" | Swagelok® tube fitting | Product View |
| SS-1VS4-PK | Stainless steel 316 | 1/4" | Swagelok® tube fitting | 1/4" | Swagelok® tube fitting | Product View |
| SS-1VS4-SC11 | Stainless steel 316 | 1/4" | Swagelok® 9 tube fitting0017 | 1/4" | Swagelok® tube fitting | Product View |
| SS-1VS6 | Stainless steel 316 | 3/8" | Swagelok® tube fitting | 3/8" | Swagelok® 9 tube fitting0017 | Product View |
| SS-1VS6MM | Stainless steel 316 | 6 mm | Swagelok® tube fitting | 6 mm | Swagelok® tube fitting | Product View |
| SS-1VS6-PK | Stainless steel 316 | 3/8" | Swagelok® tube fitting | 3/8" | Swagelok® tube fitting | Product View |
| SS-1VS8 | Stainless steel 316 | 1/2" | Swagelok® tube fitting | 1/2" | Swagelok® tube fitting | Product View |
| SS-1VS8MM | Stainless steel 316 | 8 mm | Swagelok® tube fitting | 8 mm | Swagelok® tube fitting | Product View |
| SS-20VF4 | Stainless steel 316 | 1/4" | Int. thread NPT | 1/4" | Int. thread NPT | Product View |
| SS-20VF4RT | Stainless steel 316 | 1/4" | Int. conical thread ISO | 1/4" | Int. conical thread ISO | Product View |
| SS-20VM4 | Stainless steel 316 | 1/4" | Out. thread NPT | 1/4" | Out. thread NPT | Product View |
| SS-20VM4-F4 | Stainless steel 316 | 1/4" | Out. thread NPT | 1/4" | Int. thread NPT | Product View |
| SS-20VS4 | Stainless steel 316 | 1/4" | Swagelok® 9 tube fitting0017 | 1/4" | Swagelok® tube fitting | Product View |
| SS-26VF6 | Stainless steel 316 | 3/8" | Int. thread NPT | 3/8" | Int. thread NPT | Product View |
| SS-26VF8 | Stainless steel 316 | 1/2" | Int. thread NPT | 1/2" | Int. thread NPT | Product View |
| SS-26VM8-F8 | Stainless steel 316 | 1/2" | Out. thread NPT | 1/2" | Int. thread NPT | Product View |
| SS-26VS6 | Stainless steel 316 | 3/8" | Swagelok® 9 tube fitting0017 | 3/8" | Swagelok® tube fitting | Product View |
| SS-26VS8 | Stainless steel 316 | 1/2" | Swagelok® tube fitting | 1/2" | Swagelok® 9 tube fitting0017 | Product View |
| SS-OVM2 | Stainless steel 316 | 1/8" | Out. thread NPT | 1/8" | Out. thread NPT | Product View |
| SS-OVM2-BKB | Stainless steel 316 | 1/8" | Out. thread NPT | 1/8" | Out. thread NPT | Product View |
| SS-OVS2 | Stainless steel 316 | 1/8" | Swagelok® tube fitting | 1/8" | Swagelok® tube fitting | Product View |
| Attribute | Meaning |
|---|---|
| Housing material | Brass |
| Cleaning procedure | Standard Cleaning and Packaging Instruction (SC-10) |
| Connection size 1 | 1/4" |
| Connection type 1 | Int. thread NPT |
| Maximum flow coefficient (Cv) | 0.5 - when connected to normal body or body with reverse flow |
| ECLASS (4.1) | 37110302 |
| ECLASS (5.1.4) | 37110302 |
| ECLASS (6.0) | 37020590 |
| ECLASS (6.1) | 37020590 |
| Grease | Dow Corning 111 Grease |
| O-ring material | Buna N (standard) |
| Pressure ratings linked to max. temperature | 250 psi inch man. at 250°F / 17.2 bar at 121°C |
| Pressure ratings with reference to room temperature | 1000 psi inch man. at 70°F / 68.9 bar at 21°C |
| Pressure ratings without reference to room temperature | 250 psi inch man. at 70°F / 17.2 bar at 21°C |
| Pressure/Temperature Ratings (Related and Unreferenced) | 250 psi inch man. at 70°F / 17.2 bar at 21°C |
| Series | QC6 |
| UNSPSC (10.0) | 27121701 |
| UNSPSC (11.0501) | 27121701 |
| UNSPSC (13.0601) | 27121701 |
| UNSPSC (15.1) | 27121701 |
| UNSPSC (17.1001) | 31160000 |
| UNSPSC (4.03) | 31163101 |
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CAD Disclaimer: This template has been prepared for informational purposes. Template dimensions are for reference only and are subject to change. See Swagelok product catalogs for more information. The reader should consult a qualified engineer before using the pattern in whole or in part.
2D
2D models are available for this product.
Download CAD file.
3D
There are 3D models for this product. Download CAD file.
Sales drawing
Sales drawings are available for this product. Download files.
| Product code | Housing material | Connection size 1 | Connection type 1 | Connection size 2 | Connection type 2 | |
|---|---|---|---|---|---|---|
| B-QC4-D-400 | Brass | 1/4" | Swagelok® 9 tube fitting0017 | - | - | Product View |
| B-QC4-D-4PF | Brass | 1/4" | Int. thread NPT | - | - | Product View |
| B-QC4-D-4PM | Brass | 1/4" | Out. thread NPT | - | - | Product View |
| B-QC4-D-6M0 | Brass | 6 mm | Swagelok® tube fitting | - | - | Product View |
| B-QC6-D-4PF | Brass | 1/4" | Int. thread NPT | - | - | Product View |
| B-QC6-D-4PM | Brass | 1/4" | Out. thread NPT | - | - | Product View |
| B-QC6-D-600 | Brass | 3/8" | Swagelok® tube fitting | - | - | Product View |
| B-QC6-D-6PM | Brass | 3/8" | Out. thread NPT | - | - | Product View |
| B-QC8-D-810 | Brass | 1/2" | Swagelok® tube fitting | - | - | Product View |
| B-QC8-D-8PF | Brass | 1/2" | Int. thread NPT | - | - | Product View |
| B-QC8-D-8PM | Brass | 1/2" | Out. thread NPT | - | - | Product View |
| SS-QC4-D-200 | Stainless steel 316 | 1/8" | Swagelok® tube fitting | - | - | Product View |
| SS-QC4-D-2PF | Stainless steel 316 | 1/8" | Int. thread NPT | - | - | Product View |
| SS-QC4-D-2PM | Stainless steel 316 | 1/8" | Out. thread NPT | - | - | Product View |
| SS-QC4-D-400 | Stainless steel 316 | 1/4" | Swagelok® 9 tube fitting0017 | - | - | Product View |
| SS-QC4-D-400K1 | Stainless steel 316 | 1/4" | Swagelok® tube fitting | - | - | Product View |
| SS-QC4-D-400K2 | Stainless steel 316 | 1/4" | Swagelok® tube fitting | - | - | Product View |
| SS-QC4-D-400K3 | Stainless steel 316 | 1/4" | Swagelok® tube fitting | - | - | Product View |
| SS-QC4-D-400K4 | Stainless steel 316 | 1/4" | Swagelok® 9 tube fitting0017 | - | - | Product View |
| SS-QC4-D-400K5 | Stainless steel 316 | 1/4" | Swagelok® tube fitting | - | - | Product View |
| SS-QC4-D-4MT | Stainless steel 316 | 1/4" | Out. conical thread ISO | - | - | Product View |
| SS-QC4-D-4PF | Stainless steel 316 | 1/4" | Int. thread NPT | - | - | Product View |
| SS-QC4-D-4PFK5 | Stainless steel 316 | 1/4" | Int. thread NPT | - | - | Product View |
| SS-QC4-D-4PM | Stainless steel 316 | 1/4" | Out. thread NPT | - | - | Product View |
| SS-QC4-D-4PMK2 | Stainless steel 316 | 1/4" | Out. thread NPT | - | - | Product View |
| SS-QC4-D-4PMK3 | Stainless steel 316 | 1/4" | Out. thread NPT | - | - | Product View |
| SS-QC4-D-6M0 | Stainless steel 316 | 6 mm | Swagelok® 9 tube fitting0017 | - | - | Product View |
| SS-QC4-D-6M0K1 | Stainless steel 316 | 6 mm | Swagelok® tube fitting | - | - | Product View |
| SS-QC6-D-10M0 | Stainless steel 316 | 10 mm | Swagelok® tube fitting | - | - | Product View |
| SS-QC6-D-4PF | Stainless steel 316 | 1/4" | Int. thread NPT | - | - | Product View |
| SS-QC6-D-4PM | Stainless steel 316 | 1/4" | Out. thread NPT | - | - | Product View |
| SS-QC6-D-600 | Stainless steel 316 | 3/8" | Swagelok® tube fitting | - | - | Product View |
| SS-QC6-D-600K1 | Stainless steel 316 | 3/8" | Swagelok® tube fitting | - | - | Product View |
| SS-QC6-D-600K2 | Stainless steel 316 | 3/8" | Swagelok® tube fitting | - | - | Product View |
| SS-QC6-D-600K3 | Stainless steel 316 | 3/8" | Swagelok® 9 tube fitting0017 | - | - | Product View |
| SS-QC6-D-6PF | Stainless steel 316 | 3/8" | Int. thread NPT | - | - | Product View |
| SS-QC6-D-6PM | Stainless steel 316 | 3/8" | Out. thread NPT | - | - | Product View |
| SS-QC6-DC-6HC | Stainless steel 316 | 3/8" | Hose fitting | - | - | Product View |
| SS-QC8-D-12M0 | Stainless steel 316 | 12 mm | Swagelok® 9 tube fitting0017 | - | - | Product View |
| SS-QC8-D-810 | Stainless steel 316 | 1/2" | Swagelok® tube fitting | - | - | Product View |
| SS-QC8-D-810K1 | Stainless steel 316 | 1/2" | Swagelok® tube fitting | - | - | Product View |
| SS-QC8-D-8MT | Stainless steel 316 | 1/2" | Out.  |
