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8 The NEW AVK Post/Flushing Hydrant Operating nut available in a wide variety of shapes and sizes. Two lower and one upper o-ring. 2.5 NST hose outlet standard; optional threads upon request. Easily replaced in the field. Weathershield Grease filled operating assembly. Stainless steel upper stem standard Ductile-iron nozzle section Breakable traffic flange and stainless steel break coupling The new AVK Post Hydrant is designed and built to the same strict attention to detail and quality as the full size AVK hydrants. Self draining dry barrel hydrant to prevent freezing. Available in any depth of bury (6 increments). 2 1 /4 main valve opening. Low head loss design. Cast ductile-iron barrels: 1/2 ft. through 4 1 /2 ft. Can be bolted together for any bury depth. Rated to 250 psi working pressure. All internal working parts are removable from the top for easy maintenance. Can be open left or open right. Handwheel available. Bronze drain ring and main valve seat Optional stainless steel lower stem. EPDM encapsulated ductile iron one piece main valve Fusion bonded epoxycoated shoe with foot for easy installation. Optional inlets: Flanged 2 1 /2, 3 MJ 2, 3, 4 NPT 2, 2 1 /2, 3 American AVK Company Locations To Serve You: Minden, NV N. Charleston, SC Dallas, TX Tel: (775) Tel: (843) Tel: (775) Fax: (775) Fax: (843) Fax: (775)

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12 2 AVK Check Valves: Designed for Long Life and Easy Maintenance Stainless steel bolting Hinge pin is sealed with O-rings for long-life and easy replacement Hinge, bonnet and disk are one easily removable assembly Bonnet bolts are sealed by bonnet gasket Lever and weight may be mounted on either side All ductile iron construction Steel disc is encapsulated in EPDM Interior and exterior coating fusion bonded epoxy complying with AWWA C550 Bypass bosses provided The AVK Check Valve is available in both bronze and resilient seating. Features Exceeds AWWA C508 Available in 3-inch through 12-inch All internal exposed metal is Stainless Steel or fusion-bonded epoxy coated Lightweight disc reduces inertia and assists in closing Reduced opening angle for faster closure Tested to 1,000,000 cycles; rated to 250 psi Resilient seat is drop tight, even at low pressure Can be mounted vertically or horizontally Easily maintained with no need to remove valve from the line American AVK Company

13 3 Ease of Maintenance The AVK Series 41 is designed to be the easiest to maintain check valve on the market. Simply remove the bonnet bolts the bonnet, hinge, and disc remove as one separate unit, leaving the valve body inline. The valve can then be easily cleaned and any repairs can be made without having to reach inside the valve. A new head assembly can be installed immediately to reduce downtime. Functionality The AVK check valve complies fully with AWWA C508. The valve is designed to be a clear waterway valve to ensure low head loss and unobstructed flow. But it also complies with the laying lengths of ANSI/ASME B16.10 and AWWA C508 full waterway valves. Clear Waterway Design For improved flow characteristics and lower head loss, the AVK check valve is a clear waterway design. There are no obstructions in the flow path for a 100% clear waterway. Available Options The AVK check valve comes with the following options: A lever and weight can be provided to assist with quicker closure. Standard check valves are provided without lever and weights or springs. The lever and weight may be mounted on either the left-hand or right-hand side. Right-hand mounting is standard. A lever and spring can also be supplied to assist with quicker closure. Lever and Spring Clear Waterway Design Lever and Weight American AVK Company

14 Sample Specifications for Check Valves General Swing check valves shall be of the flanged type and in full compliance with AWWA C508. Valves may be supplied with or without external lever with weight or spring. The pressure rating shall be 250 psi. Check valves shall be American AVK Series 41 or equal. Valve Bodies Valve bodies shall be of ASTM A536 Ductile Iron. Flanges shall be in compliance with ANSI B16.1 Class 125. The body shall be designed so that it is an AWWA clear waterway design. Laying lengths shall comply with ANSI/ASME B Valve Disc Disc shall be a carbon steel core completely encapsulated with EPDM. Valve Hinge and Hinge Pin The hinge and hinge pin shall be shall be constructed of AISI 316 stainless steel or ductile iron. O-rings shall be used to seal the hinge pin. Maintenance The check valve shall be designed such that the disc, hinge, and bonnet can be removed as one assembly. Testing Testing shall be performed in accordance with AWWA C508. Test results shall be furnished to the end user upon request. Coating All ferrous surfaces (except stainless steel) shall be fusion-bonded epoxy coated to the requirements of AWWA C550. Head Loss of AVK Series 41 Check Valves Flow in CFS Head Loss in Feet of Water inch 4-inch 6-inch 8-inch 10-inch 12-inch Head Loss in PSI Flow in GPM American AVK Company Locations To Serve You: Minden, NV N. Charleston, SC Dallas, TX Tel: (775) Tel: (843) Tel: (775) Fax: (775) Fax: (843) Fax: (775)

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