Trade.Information

Product Name: Swing-Flex® Check Valves

Product Description

Designed to be maintenance free, our Swing-Flex® Check Valve provides superior performance when compared to traditional swing checks. The Memory-Flex® disc, the valve's only moving part, is easily replaced without removal of the valve from the line. Its unrestricted full flow design makes the Swing-Flex® an excellent choice for slurries and sludge, even in vertical flow up applications. Non-slam performance is assured by placing the valve seat on a 45° angle, thereby minimizing disc travel. When used with optional rubber lining, our Swing-Flex® Check Valves are ideal for highly abrasive and corrosive applications. Independent flow, cycle, and proof of performance test reports are available on request. Specifications: - 1.1 This specification is intended to cover the design, manufacture, and testing of 2 in. (50 mm) through 36 in. (900 mm) Swing-Flex® Check Valves suitable for cold working pressures of 250 psig, 150 psig for 30 in. (800mm) and larger in water, wastewater, abrasive, and slurry service. 1.2 The Check Valve shall be of the full body type, with a domed access cover and only one moving parts, the flexible disc. Standards and Approvals 2.1 The valves shall be designed, manufactured and tested in accordance with American Water Works Association Standards ANSI/AWWA C508. Connections 3.1 Valves shall be provided with flanges in accordance with ANSI B16.1, Class 125. Design 4.1 The valve body shall be full flow equal to nominal pipe diameter at all points through the valve. The 4 in. (350mm) valve shall be capable of passing a 3 in. (75mm) sphere. The seating surface shall be on a 45 degree angle to minimize disc travel. A threaded port with pipe plug shall be provided on the bottom of the valve to allow for field installation of a backflow actuator, without special tools or removing the valve from the line. 4.2 The top access port shall be full size, allowing removal of the disc without removing the valve from the line. The access cover shall be domed in shape to provide flushing action over the disc for operating in lines containing high solids content. A threaded port with pipe plug shall be provided in the access cover to allow for field installation of a mechanical, disc position indicator. 4.3 The disc shall be of one-piece construction, precision molded with an integral o-ring type sealing surface, and contain alloy steel and nylon reinforcement in the flexible hinge area. The flex portion of the disc shall be warranted for twenty-five years. Non-Slam closing characteristics shall be provided through a short 35 degree disc stroke and a memory disc return action. 4.4 The valve disc shall be cycle tested 1,000,000 times in accordance with ANSI/AWWA C508 and show no signs of wear, cracking, or distortion to the valve disc or seat and shall remain drop tight at both high and low pressures. The test results shall be independently certified. Options: Note, remove (when specified) to include the following options as part of the specification. 6.1 A screw-type backflow actuator shall be provided (when specified) to allow opening of the valve during no-flow conditions. Buna-N seals shall be used to seal the stainless steel stem in a bronze bushing. The backflow device shall be of the risingstem type to indicate position. A stainless steel T-handle shall be provided for ease of operation. 6.2 A mechanical indicator shall be provided (when specified) to provide disc position indication on valves 4” and larger. The indicator shall have continuous contact with the disc under all operating conditions to assure accurate disc position indication. 6.3 A pre-wired limit switch will be provided (when specified) to indicate open/closed position to a remote location. The mechanical type limit switch shall be activated by the external position indicator. The switch shall be rated for NEMA 4, 6, or 6P and shall have U.L. rated 5 amp, 12 or 250 VAC contacts. 6.4 A Bottom Mounted Oil Dashpot (Oil Cushion) shall be provided when specified to provide hydraulic control of the final 10% of valve closure and reduce valve slam and water hammer normally associated with rapid flow reversal conditions on pump shut down. The dashpot shall consist of a high pressure hydraulic cylinder, adjustable external flow control valve, oil reservoir, pressure gauge, staniness steel air inlet valve, and piping designed to control the closing speed of the last 10% of travel in 1-5 seconds. A threaded brass dahpot bushing unit with a grease fitting for lubrication shall connect the cylinder to the valve and shall have an air gap to prevent hydraulic fluid from entering the valve and contaminating the water system. A snubber rod fitted with O-ring seals and rod wiper scrapers shall make contact with the lower portion of the disc’s stainless steel strike plate. Manufacture 7.1 The manufacturer shall demonstrate a minimum of five (5) years experience in the manufacture of resilient, flexible disc check valves with air and hydraulic cushions. 7.2 All valves shall be hydrostatically tested and seat tested to demonstrate zero leakage. When requested the manufacturer shall provide test certificates, dimensional drawings, parts list drawings, and operation and maintenace manuals. 7.3 The exterior and interior of the valve shall be coated with an ANSI/NSF 61 approved fusion bonded epoxy coating. 7.4 Swing-Flex® Check Valves shall be Series #500 as manufactured by Val-Matic® Valve & Manufacturing Corporation, Elmhurst, IL. USA or approved equal.