Check Valves. UL listed and labeled, FM approved, 175 psi iron body, bronze mounted, horizontal swing check valve with bolted bonnet and flanged end connections. Check valves shall be designed for replacement of internal parts without removal of valve body from piping with the exception that water check valves may be used with freestanding Fire Department Connections.
Check Valves. Dual check valves shall be 19mm or 25mm bronze female threaded, all position, Inline dual check valves. - Acceptable check valve is a Xxxxxxx or Conbraco or approved equal.
Check Valves. Carbon steel, ASTM A-216 Gr WCB, swing type with bolted bonnet.
Check Valves. Check valves shall be measured on an individual basis on the number of each size valve and box assembly acceptably installed.
Check Valves. Check valves shall be paid for at the unit price per each size check valve and box assembly installed and shall cover the cost for all materials, transportation, labor, equipment, excavation, sheeting and shoring, installation of the check valves, concrete vault or manhole, concrete pad or collar, valve identification disc, valve marker, valve tag, polyethylene encasement, protection of existing utilities, backfill material, disposal of unsuitable backfill materials, clean fill, tampi ng, testing, densities, utility crossings, dewatering, trench stabilization, clean-up, restoration and all work and materials necessary to install the check valve and place it in service.
Check Valves. 1. Swing check valves sizes 4-inch (100 mm) through 30-inch (750 mm) shall be constructed of a cast iron body with a bronze seat ring, and a noncorrosive shaft for attachment of weight and lever. Check valves shall comply with AWWA C508 requirements and have a 150-psi minimum pressure rating.
2. The valve disc shall swing completely clear of the waterway when valve is fully open, permitting full flow. The disc shall be cast iron, rubber faced.
3. Check valves shall be flanged in accordance with ANSI 16.1, Class 125, and installed inside a vault or pit.
4. Provide brass identification tag imprinted with “SEWER”, valve size, valve type, and direction and number of turns to open. Provide a ¼-inch (8 mm) hole in the brass tag and attach the tag to the end of the locate wire (twist wire around tag). Tag shall be 2-inch (50 mm) diameter and ⅛-inch (6 mm) thick brass with a ¼-inch (8 mm) hole.
Check Valves. Inlet check valves shall be slow-opening as manufactured by OCV or ClaVal or approved equal. Outlet check valves shall be wafer check valves as manufactured by Xxxxxxxx or approved equal. Valves or all wetted parts shall be NSF 61 approved.
Check Valves. A. Iron body, bronze trim, swing disc, renewable disc and seat.
Check Valves. Pumps, active valves, and loss elements all can be equipped with a check (non-return) valve to prevent backflow. Either a normal check valve which will close or open depending on conditions or a non-reopening check valve which will close only once and remain closed can be designated. The closing time (CV Time) is the time it takes for the check valve to close once closing is initiated. The check valve resistance (CV Res) is the resistance (head/flow^2) when the valve is fully open. If a Check Valve is closed for the steady state then the element which incorporates the Check Valve will be initially closed. If conditions are appropriate the element Check Valve will open during the transient analysis. Pipe2010: Surge does NOT permit modeling stand alone check valves - unlike KYPipe where a pipeline can have a stand alone check valve. When there is a standalone check valve on a pipeline, then the user must model that as an active valve with a check valve. An active valve by itself may or may not have a check valve. When a KYPipe model that has standalone check valves is converted to Pipe2010: Surge model, the program deletes the standalone pipe check valves and produces warning messages. See Chapter 4: System Data / Simulation Specs for information on CV Settings for inertial effects A pump bypass line is one which will open when the suction (upstream) head exceeds the discharge (downstream) head. The bypass line resistance (Byps Res) is the resistance of this pipe. A valve bypass line is used to define a different resistance when flow reverses and is assumed to flow in the bypass line. The list above shows all the devices that can be included in a Surge model. Some of these devices are utilized in both the initial steady state and the surge analysis. These devices have specific modeling requirements (number of pipe connections) for Surge which are illustrated in the network shown below and discussed on the following pages. Each of these devices requires unique input data, which includes the elevation (in feet or meters). The additional data requirements for each device are presented on separate pages along with notes regarding their use. Demands – each junction may be assigned a Demand by the user or through meters connected to pipes connected to the junction. The demand type, Dm Type, is not utilized in the surge analysis. Connection Restrictions: No restrictions for junctions Under System Data | Simulation Specs: Calculate using Leakage Factor or Leakage Co...
Check Valves. Check valves shall be clear-opening, swing-check type, with a bronze or stainless steel seat ring and an EPDM rubber xxxxxxx facing. Flanged check valves of sizes 4 inch (101.6 mm) and larger shall have flanged inspection and access cover plates.
