UWP Model , Ductile Iron Butterfly Valve – Conforms to AWWA C – DI Bodies translate into pure strength achieving three times that of Cast Iron alone. AWWA C Rubber-Seated Butterfly Valves. Document Language: English; Published By: American Water Works Association (AWWA); Page Count: The butterfly valves shall conform to the latest edition of AWWA-C Standard for Rubber Seated Flanged AWWA Butterfly Valves. The valves and actuators.
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Valves described in this standard are provided in four body types and in classes as follows: Until each optional feature is specified by the user, the product or service is not fully defined. Materials shall comply with the requirements of the Safe Drinking Water Act and other federal requirements.
Valve seats shall be designed to be leak-tight in both directions at differential pressures up to, and including, the rated pressure of the valve class. Cavities shall be drained of water. This information can include the following: Use of Annex A procedures may not always be identical, depending on the certifier.
To demonstrate that the valve and actuator are workable, valves having direct-mounted actuators, except those provided with extension shafts of more than 36 in. Type of shaft seal Sec.
ABAW-AWWA C504 and C517
The bodies of valves shall have two shaftbearing hubs cast integrally with the valve bodies. The party that supplies material or services. If shop inspection by the purchaser is required. Many types of large buried pipes are designed to deflect 2—5 percent of pipe diameter, which is harmful to the valve integrity. Class B discs shall be ductile iron, fabricated steel, cast steel, or stainless steel. This standard limits handwheel rim pull, but not handwheel diameter.
American National Standards are subject to periodic review, and users are cautioned to obtain the latest editions. An American National Standard is intended as a guide to aid the manufacturer, the consumer, and the general public. When assembled, valves manufactured in accordance with this standard shall be well-fitted and shall operate smoothly.
Ductile Iron AWWA Butterfly Valve
Bearings shall be designed for a pressure not to exceed the published design load for the bearing material or one-fifth the compressive strength of the bearing or shaft material. Hydraulic testing, flow capacities, and valve torques are based on the flow, upstream of a valve, being uniform and undisturbed, like the flow produced by a long length of constant-diameter, straight pipe.
Detailed description of nonstandard end connections Sec. Class B and class B, in sizes 3— 24 in. The number of cycles shall be in accordance with Table 4. Interior and exterior coating materials Sec. Butterfly valves are generally used for pipelines carrying liquids and gases. The required number of cycles appears in Table 6. The single piece Stainless Steel shaft is capable of high torques and will handle any actuator on the market via the mounting plate.
Rotork: AB AWWA C And C
A type of seal consisting of an elastomer in the shape of a torus, i. If a water pipe must pass through such a contaminated area or an area subject to contamination, consult with the manufacturer regarding permeation of awws walls, jointing materials, etc. Clearances required for the actuator, and clearances required to remove the actuator c. The evaluations must include the determination of the hydraulic characteristics of the system in which the valve will be installed and the operation of the valve on—off or throttlingincluding 1 the maximum transient and static differential pressure across the valve disc and 2 flow through the valve under the most adverse operating conditions.
Shell thickness measurements taken at points diametrically opposite to each other shall, when added together 5c04 divided by two, equal or exceed the minimum body shell thickness given in Table 1. The Awqa recognises that the rim pull and input torque requirements specified in Section 2.
AWWA Specification – Stealth Valve & Controls Ltd.
awaw Diameters for all classes of valves except for class B are based on use of any allowable material. Through its members, AWWA develops industry standards for products and processes that advance public health and safety. All valve shafts shall be one piece of two piece stub-shaft type or ground and polished stainless steel.
The Corporation shall give preference to those actuators meeting the specifications stated in Section 2. STORAGE If it is not practical to store the valve indoors, protect the valve and actuators from weather and the accumulation of dirt, rocks, and debris. Manufacturers of butterfly valves developed tight-closing, rubber-seated types for cooling water systems and power stations.
To evaluate the health effects of products and drinking water additives from such products, state and local agencies may use various references, including 1.
Each valve shall have a awwwa shaft extending completely through the valve disc or have a stub-shaft arrangement, as described below. Rubber seats applied to the valve body and penetrated by the valve shaft shall be adequately reinforced to prevent the seat from becoming inflated by pressure behind the seat.
No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information or retrieval system, except in the form of awa excerpts or quotations for review purposes, without the written permission of the publisher. Required flow rate through valve. Valve shafts shall be wrought stainless steel or nickel-copper alloy.
Do not deflect the pipe-valve joint.