ERHARD is a company of. Datasheet ERHARD ERK tilting-disc check valve

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1 ERHARD is a company of Datasheet

2 ERHARD ERK tilting-disc check valve The universal check valve with double excentric valve disc A key component of the is the valve disc which has a freely oscillating, flow-facilitating design with double eccentricity support. The shafts are in maintenance-free, self-lubricating friction bearings, and the shaft has maintenance-free seals. A rolled up, solid body seat ring made of, and a disc seat ring which is additionally provided with an elastic fine seal, provide perfect sealing The ERHARD ERK check valve is designed for medium water, from DN also suitable for sewage and it s designed in a short face-to-face length. With nominal diameters ranging from DN to DN and pressure ratings ranging from PN to PN, as well as numerous options, the ERHARD ERK tilting-disc check valve provides a solution that can be individually adapted, even for special applications. For accident prevention in the swing area of the lever a protective cage is available. For an legal backflow, for delayed smooth closing or opening and to avoid pressure shock a damping device, weight-loaded hydraulic actuator, is available. To improve the economics of the plant, a pneumatic fill opening device is available, too. Operating instructions BAE_ERHARD_ERK_ tilting_disc_- ERHARD_ERK_tilting_disc_ SOE_-

3 Short body EN -, basic line Shipment Nominal sies DN - DN Pressure ratings PN - PN Working temperatures Anschlüsse - C to + C for water - with flanges to EN - with flanges to international standards Materials Body and valve disc - Cast iron with spheroidal graphite GGG - Cast iron with lamellar graphit GG Seals Protection against corrosion Elastomer Perbunan, EPDM oder Viton - EKB fusion bonded epoxy - Coating according to customers request

4 Tilting-disc check valve single components Standard design with weight-loaded lever Pos. Description Materials Coating Body ductile cast iron EKB Seat ring Valve disc ) ductile cast iron EKB Disc facing ring O-ring Spacer O-ring O-ring Shaft Key Locking plate Hexagon bolt elastomer (NBR) elastomer (NBR) Flanged bearing ductile cast iron EKB Bush Fitting ring Washer Hexagon bolt steel-sn-ptfe brass Lever steel EKB ) DN : austenitic CrNi steel

5 For DN and larger, the valve disc protrudes during its travel from the body on the inlet side. Protective guard to be mounted by user Nominal sie DN Facetoface dim. in mm Flange-Ø D Space requirement in mm Feet dimensions in mm Weight approx. kg PN PN e e e e e e h h b PN PN PN PN - - -,,,,,,,,,,,,,,,, h h Volume m

6 Suggestion for installation of check valve and butterfly valve Attention! Installation must be effected in such a way that the weight-loaded lever of the check valve is on the left seen in flow direction and that the gearbox of the butterfly valve is on the right, seen in flow direction. Thus, there will be no collision between weight-loaded lever and gearbox. Required back pressure to absolute tightness:, -, bar e e Check valve Intermediate pipe Butterfly valve Nominal sie DN L mm L mm e mm e mm c mm

7 Functional and control diagram of a hydraulic damping device ERHARD hydraulic damping devices are double-acting, i.e., damping is effective in opening direction and in closing direction. Appropriate kinematics and shape of the damping cylinder brings about the damping ones shown in the below diagram. The hydraulic damping device is of very compact design and well approved in terms of ease of maintenance, adustability, and functionality thanks to its being installed externally. If the standard types are equipped with hydraulic damping cylinder, due to shaft dimensioning and material, the admissible back pressure is limited as follows: DN Max. admiss. back press. in bar,,,,,,,,,,,,, Types for higher back pressure upon request.

8 Lever arrangement For horiontal pipes Flow direction Fig. on the left, seen in flow direction Fig. on the right, seen in flow direction Fig. on both sides For vertical pipes, upward flow Fig. on the left, seen in flow direction Fig. on the right, seen in flow direction Fig. Counterweight with damping device on both sides For vertical pipes, downward flow Fig. on the left, seen in flow direction Fig. on the right, seen in flow direction Fig. Counterweight with damping device on both sides When placing the order, please specify the fig. No. of the lever arrangement.

9 Zeta-values DN PN / DN PN / Pressure loss [mmws] Degree of opening [% ( % = open)] Pressure loss [mmws] Degree of opening [% ( % = open)] DN PN / DN PN / Pressure loss [mmws] Degree of opening [% ( % = open)] Pressure loss [mmws] Degree of opening [% ( % = open)] DN PN / DN PN / Pressure loss [mmws] Degree of opening [% ( % = open)] Pressure loss [mmws] Degree of opening [% ( % = open)]

10 Zeta-values DN PN / DN PN Pressure loss [mmws] Degree of opening [% ( % = open)] Pressure loss [mmws] Degree of opening [% ( % = open)] DN PN / DN PN / Pressure loss [mmws] Degree of opening [% ( % = open)] Pressure loss [mmws] Degree of opening [% ( % = open)] DN PN / DN PN / Pressure loss [mmws] Degree of opening [% ( % = open)] Pressure loss [mmws] Degree of opening [% ( % = open)]

11 Zeta-values DN PN / Pressure loss [mmws] Degree of opening [% ( % = open)]

12 Your Choice in Waterflow Control TALIS is the undisputed Number One for water transport and water flow control. TALIS has the best solutions available in the fields of water and energy management as well as for industrial and communal applications. We have numerous products for comprehensive solutions for the whole water cycle from hydrants, butterfly valves and knife gate valves through to needle valves. Our experience, innovative technology, global expertise and individual consultation processes form the basis for developing long-term solutions for the efficient treatment of the vitally important resource water. ERHARD GmbH & Co. KG Postfach D- Heidenheim Meeboldstrasse D- Heidenheim Phone: + - Fax: info@erhard.de Internet: Note: Specifications may be changed without notification at any time. Copyright: No copying without express written permission of ERHARD ERHARD is a Registered Trademark. EN (/)