Product Overview

The Hawle Butterfly Valve: Double Eccentric is designed for DN 150 to 1400 and is available with PN 10 or PN 16 pressure ratings. This standard butterfly valve is suitable for both buried and chamber installations. Its streamlined design and smooth finish of the body provide minimum resistance to flow, while the streamlined and low-profiled disc, including closed hubs, ensures higher Kv values. The double eccentric disc design significantly reduces seal wear and operating torque. Sealing is achieved by an endless T-profile resilient sealing ring, held on the periphery of the disc by a retaining ring, which is pressed against the conically shaped seat face of the body in the closed position, providing safe sealing in either direction of flow. In the opened position, the sealing ring is completely unstressed. The stainless steel weld-filled and finished integral body seat ensures a corrosion and erosion resistant seat face, enabling the valve to be manufactured drop-tight. The one-piece retaining ring prevents the sealing ring from rolling out, and the sealing ring can be replaced easily on-site without dismantling the valve disc or requiring special tools. Positive disc-to-shaft connection is ensured by the use of a key. All butterfly valves are provided with standard flanges according to EN ISO 5210 for actuator installation. Integral lifting holes provide easy installation, and the feet offer strong ground support. A unique cast tracking number on every valve allows for easy traceability and identification.

Key Benefits

• Standard butterfly valve suitable for buried or chamber installations.
• Streamlined body and disc design provide minimum resistance to flow and higher Kv values.
• Double offset disc design reduces seal wear and torque.
• Endless T-profile resilient sealing ring ensures safe sealing in either flow direction.
• Sealing ring is completely unstressed in the opened position.
• Stainless steel weld-filled integral body seat provides corrosion and erosion resistance.
• Valve can be manufactured drop-tight.
• One-piece retaining ring prevents sealing ring rollout.
• Sealing ring can be easily replaced on-site without dismantling the disc or requiring special tools.
• Positive disc-to-shaft connection by key.
• Integral lifting holes and feet for easy installation and strong ground support.
• Unique cast tracking number for traceability and identification.
• Worm gear operators designed for actuation with little force.
• Split shaft guarantees maximum restriction to flow.
• Multiple O-ring shaft sealing system guarantees maintenance-free sealing.
• Self-lubricating plain bearings reduce shaft friction and operating torque, preventing axial movement.

Applications

• Buried installations.
• Chamber installations.
• Pipelines requiring robust and low-maintenance flow control.

Features & Construction

• Body: Ductile iron, epoxy powder coated inside and out.
• Disc: Ductile iron, epoxy powder coated inside and out; streamlined and low-profiled with closed hubs.
• Sealing Seat: Stainless steel welded and microfinished integral body seat.
• Sealing Rings: Elastomer.
• Retaining Ring: Stainless steel, one-piece.
• Shafts: Stainless steel, split shaft design.
• Shaft Sealing: Multiple O-ring system.
• Bearings: Bronze, self-lubricating plain bearings.
• Shaft Connection: Positive disc-to-shaft connection by key.
• Connection Flange for Actuator: Standard flanges according to EN ISO 5210.
• Lifting Holes and Feet: Integral.
• Handwheel: Cast iron, epoxy powder coated (standard version).
• Worm Gear Operators: Designed for low force actuation.
• Tracking Number: Unique cast number on every valve.

Technical Specifications

Property	Details
DN Range	DN 150 - 1400
Pressure Rating	PN 10 | PN 16
Face-to-Face Dimension	EN 558-1 SERIES 14
Flange Connection Dimensions	EN 1092-2
Actuation Device (Standard)	Worm gearbox and handwheel
Protection Class (Actuation Device)	IP 68

Dimensions and Weights (Selected Models)

Note: Dimensions and weights vary by DN and pressure rating. The table below provides a representative sample for PN 16 (where available) and PN 10.

DN (mm)	PN	L (Series 14) (mm)	Weight (kg)	H1 (mm)	Turns to Open/Close
150	10 / 16	210	45.0	143	11.25
200	10 / 16	230	60.0	180	11.25
250	10 / 16	250	95.0	213	10
300	10 / 16	270	115.0	242	10
350	10 / 16	290	155.0 / 162.0	264 / 272	12.5
400	10 / 16	310	165.0 / 204.0	293 / 300	12.5 / 36.25
450	10 / 16	330	220.0 / 240.0	320 / 330	36.25
500	10 / 16	350	285.0 / 325.0	345 / 370	43.5
600	10 / 16	390	350.0 / 435.0	400 / 432	43.5
700	10 / 16	430	575.0 / 610.0	460 / 467	104
800	10 / 16	470	680.0 / 780.0	520 / 525	104
900	10 / 16	510	980.0 / 1065.0	568 / 573	192.5
1000	10 / 16	550	1155.0 / 1320.0	625 / 638	192.5
1100	10 / 16	590	1558.0	695 / 696	192.5
1200	10 / 16	630	1965.0 / 2375.0	738 / 753	362.5
1400	10 / 16	710	2690.0 / 2870.0	848 / 848	362.5

Installation & Maintenance

• Applicable for below ground installation, with simple assembly of the extension spindle.
• Sealing ring can be replaced easily on-site without dismantling the valve disc or requiring special tools.
• Multiple O-ring shaft sealing system guarantees maintenance-free sealing.

Suitable Accessories (Available Separately)

• Adapter for extension spindle E2/E3 (underground installation), DN 200: No. 9211.
• Adapter square cap: No. 2161.
• Actuator: No. 9920.
• Flat gasket: No. 3390.
• Dismantling piece: No. 9810.