Deg Four

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Hexpipe Barb Fitting

An elbow Barb Fitting for use with flexible pipe and the like is provided with a Barb Fitting drive cap for cooperating with a compatible drive tool, such as a socket or nut driver. The Barb Fitting drive cap is configured as a hexagonal cap, square cap, star cap or other common driver shapes.The Barb Fitting drive cap is positioned on the fitting body opposite the opening to the barbed end, but coaxially aligned with the barb. The cross-sectional body width of the Barb Fitting drive cap is narrower than a corresponding width of the fitting body for exerting a drive force on the fitting body. Alternatively, the elbow Barb Fitting is provided with a drive recess configured as a hexagonal recess, slotted recess, cross point recess, square recess, star recess or other common driver shapes for cooperating with a compatible driver. Common elbow fitting types include Hose elbow 90 DEG or Swivel 45DEG ells.

Low density polyethylene pipe has been used as a water conduit in special applications for decades. Low density polyethylene pipe is generally flexible and extremely resilient, is capable of withstanding working pressures of 100 PSI and greaterand is not reactant in most environments. Because of resilience, low density polyethylene pipe has been the pipe of choice for use in irrigation systems, particularly as a subterranean riser.

Typical PVC supply lines for irrigation systems are installed in a trench, with only the tops of sprinkler heads exposed above grade. An in-line connection is installed in the PVC supply line for each sprinkler, the connection is combinationfitting (usually a threaded T-fitting) having at least one PVC slip joint and a threaded joint for coupling a sprinkler head or the like. In a typical irrigation system installation, lawn sprinklers are connected to the PVC supply pipe via a verticalriser pipe and the supply pipe lines at the bottom of the trench. The vertical riser is connected to the threaded T-fitting on the PVC pipe and another pipe thread on the sprinkler. The sprinklers are positioned directly over the rigid riser and thePVC supply pipe, and the trench is backfilled with the sprinkler head exposed. Although this is an extremely efficient installation technique, it suffers from a high instance of post installation pipe damage because of the configuration. Afterinstallation, if pressure is placed on the sprinkler head, such as by a person walking on the sprinkler or a vehicle driving over it, the force of the weight is transferred vertically through the traditional riser (from the sprinkler) and is absorbed bythe PVC pipe and connection fitting. This often results in a catastrophic breakage of the PVC pipe at the fitting, the fitting itself or both.

This problem is overcome by replacing the riser in the installation with a flexible swing pipe of low density polyethylene pipe that will absorb much of the downward force from a pedestrian, lawn mower, golf cart or even a vehicle on thesprinkler. In a typical installation, a polyethylene swing pipe is connected between a pair of adapters such that the sprinkler head is not positioned directly over the PVC supply line, therefore, these adapters are usually in a Tee or ell (elbow)configuration. Flexible polyethylene pipe will not accept pipe threads and hold the working pressure of an irrigation system. Therefore, polyethylene pipe must be connected to an adapter with threaded and barbed ends. The threaded end of the adapterscrews into threaded sprinkler and/or threaded in-line Tee-fitting pipe just as the riser. The barbed end has angled barbs that grab and hold on to the inner surface of the polyethylene pipe and is forced into the polyethylene swing pipe. Barbedfittings are inexpensive and form a watertight and permanent seal without using glue or pipe clamps.

The barrel of the barbed end of the adapter has an outer diameter that is slightly larger (nominally 0.5 inch) than the inner diameter of the polyethylene swing pipe (nominally 0.49 inch) with several circular rows of angled barbs that protrudefrom the barrel between 1/16 inch (0.0675 inch) and 3/16 inch (0.1875 inch). During installation, the barbed end is manually forced into polyethylene swing pipe, usually by an inch or more, to ensure a water tight and permanent connection to the swingpipe. Often, the amount of force necessary to seat the polyethylene swing pipe around the barb is significant. Thick-wall and high pressure swing pipe are particularly problematic as they are usually much more rigid than standard-duty polyethyleneswing pipe. Even standard-duty pipe can be difficult to seat in temperatures below 50° F.

The present invention relates to an improved Barb Fitting for use with low density polyethylene irrigation pipe and the like. A combination Barb Fitting is provided with a drive cap for cooperating with a compatible tool, such as a socket ornut driver. The drive cap may be configured as a hexagonal cap, square cap, star cap or other common driver shapes. The drive cap is positioned on a fitting opposite the opening to the barbed end, but aligned coaxially with the barb. Common fittingtypes include ells (90° or 45°) and Tees. Alternatively, combination Barb Fitting is provided with a drive recess for cooperating with a compatible driver. The drive recess may be configured as a hexagonal recess, slotted recess, crosspoint recess, square recess, star recess or other common driver shapes.

About the Author

Our company has formed featured products of Pneumatic Guns Fittings and Hydraulic Fitting as main products including Hose Barb Fitting,Quick Connector,Hose elbow 90 DEG,Barb Fitting,Pneumatic Fitting,Push in fitting,Swivel 45DEG,DOT Brass Fitting,M12 thrust washer,M22 thrust washer,M16 thrust washer,Unequal hex nipple and general and comprehensive series.

Trig help? Angles and stuff?

How can I find the trigonometric functions of these four angles?

330 deg., 135 deg., 315 deg., -150 deg.

Can someone explain all this for me?

I drew a picture to help me by looking the reference angle but it doesn't help...

I'm entering a Algebra II/Pre-Calc class for my sophmore year..

formulat tips:
cot = 1/tan
sec = 1/cos
csc = 1/sin

Use calculator to find sin(330)
press 3
press 3
press 0
press sin

sin(330)=-.5
cot(330) = 1/sin(330) = 1/(-0.5)= -2

cos(330)= 0.866 (calculator)
sec(330) = 1/cos(330) = 1/0.866=1.1547

tan(330) =-0.577 (calculator)
cot(330) = 1/tan(330) = 1/(-0.577) = - 1.733

do the same for the rest of them

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