D343H Hard Seal Butterfly ValveD343H Hard Seal Butterfly ValveD343H Hard Seal Butterfly ValveD343H Hard Seal Butterfly ValveD343H Hard Seal Butterfly Valve
D343H Hard Seal Butterfly ValveD343H Hard Seal Butterfly ValveD343H Hard Seal Butterfly ValveD343H Hard Seal Butterfly ValveD343H Hard Seal Butterfly Valve

D343H Hard Seal Butterfly Valve

Size Range: DN80~DN3200

Deaign standard: EN 593, MSS SP67, API 609, BS5155

Test inspection: API 598, ISO 5208, EN 12266

Application Temperature:-29 °C to 425°C

Pressure Rating: PN10, PN16, CL150, JIS 5K/10K

Suitable medium: Fresh water / Sea water / Salts water / Steam / Gas / Air etc

Product Introduction

D343H hard seal butterfly valve is a new generation of patented products which is independently researched and developed by our company, no pin connection is through a valve rod milling flat straight connected with the butterfly plate matched, with countersunk head bolt is fixed, is more convenient in assembly, firmer connection security. Use triple eccentric sealing structure, no mechanical wear, can achieve zero leakage, with bidirectional sealing function superior, is used as the best device in oil, chemical industry, metallurgy, electric power, building materials, food, medicine, water supply, and drainage, gas delivery of different media, such as adjust, cut off or connected to the fluid flow.

WESDOM D343H hard seal eccentric butterfly valves with tilted disc are designed for easy operation and long service life. The disc seal is made of WESDOM’s drinking water approved EPDM rubber featuring an excellent compression set and ability to regain the original shape. The high quality epoxy coating and fully encapsulated shaft/disc connection ensure optimal corrosion protection and durability.

Why choose us!

  • WESDOM patent products, patent certification

    The product side flanges comply with national, German, Russian, American, British and Japanese standards and other domestic and international standards

    for multiple pressures, easy connection and wide adaptability, which can reduce the type of purchase and stock.

  • The product has an independent identity to ensure traceability

    Each wesdom product has its own unique identification number, to ensure product traceability.

  • Provide material inspection report

    All wesdom products can provide the material inspection report of the main parts.

  • One-stop service

    One-stop service, we not only supply high quality products, also supply solutions and after-sales service.

  • WESDOM has a lot of project experience

    We have a lot of project experience in countries such as Pakistan and the Philippines, WESDOM has always been noticed all over the world, and trust comes from quality.

  • WESDOM has a strict quality control system

    WESDOM has a strict quality control system and before delivery, we test 100% of each product to ensure its quality, promising you a high quality product.


Standard Test

Standard Test

Factory Tour

WESDOM GROUP consists of 5 factories and 4 overseas branches. The five factories are mainly located in Tianjin, Hebei, Shandong, Lianyungang and Wenzhou. The four foreign branches are located in Tanzania, Zambia, Kenya and Indonesia.

Detailed parameters

D343H Hard Seal Butterfly Valve

D343H hard seal eccentric butterfly valve description:

The range of WESDOM valves can be used for overground installation, in valve chambers and buried systems.butterfly valves in a range of DN 150 to 2000 mm and PN 10, 16 and 25 bar have been designed to isolate the flow of fluid in:

①Potable water supply pipelines and treatment plants.

②Transportation of filtered and recycled water.

③Irrigation distribution networks.

④Water-pumping stations and hydroelectric plants.


D343H hard seal eccentric butterfly valve characteristic:

①Body adopts integral casting technology, compact structure, small volume and light weight;

②Disc three ccentic mounting. When closed, disc expands outwards to achieve the best peripheral seal; When opened, disc and seal ring quickly separated, effectively prevent the seal ring wear;

③Sealing ring design is novel, simple and maintenance-free;

④Sealing ring form is multi-level metal hard seal,suitable for harsh working conditions;

⑤Due to the use of three eccentric structure, the operating torque is greatly reduced;

⑥The flow resistance is small, the rated flow coefficient is large, about 3 times that of the same caliber single-seat valve;

⑦Strong self-cleaning ability, long service life;

⑧Standard actuators (pneumatic piston and electric) are interchangeable.

Double eccentric butterfly valve

Advantages of wesdom butterfly valve!

  • Longer service life thanks to tilted disc

    The tension on the disc is released after a few degrees of opening which minimises wear of the disc seal. Furthermore, the design minimises the compression of the sealing which ensures low operating torques.

  • Safe disc and shaft connection

    The disc and shaft are connected by means of a key and a keyway. The key’s secured with two set screws to prevent fluttering caused by flow velocity and necessary play in the key and keyway connection. Within the large dimensions the disc is secured with two stainless steel drive dowels, with key and keyway as back-up.

  • Two seat designs

    The integral seat design features a machined and epoxy coated ductile iron seat integrated in the body. The stainless steel seat design has a replaceable seat ring of stainless steel sealed with an O-ring to avoid leakages under the seat ring.

  • Disc seal optimised for high performance

    The disc seal is formed to secure fixation in correct position providing a very reliable function. The superb rubber quality makes it possible to reduce the amount of rubber which ensures low closing torques. The EPDM sealing is approved by DVGW, KIWA and WRAS.

  • Shaft design features

    The shaft sealing’s replaceable under pressure to enable easy maintenance. Sealings of EPDM secure tightness from inside and out, and NBR sealings protect against impurities and fluids from outside.

  • The low friction PTFE bearings ensure low

    Operating torques and therefore the protected shaft ends secure durability since there are no uncoated ductile iron surfaces exposed to the media.

  • Bi-directional and slim design

    The valves are bi-directional although valves from DN700 and up are marked with an arrow indicating the preferred flow direction. We’ve also minimised the weight to make handling easier and to put less strain on the environment.


Project Name: Pakistan Sewage Treatment Plant Project

Main Products: Flanged/lug Butterfly Valves and Gate Valves

This case is an old customer from Pakistan. Because he has purchased valve products from WESDOM many times, he has very high trust and evaluation on WESDOM. He needs a lot of butterfly valves and gate valve products in the sewage treatment plant project which he is responsible for. They sent the requirements to the businessman of WESDOM's international trade department without hesitation. Of course, WESDOM still returns this old customer in Pakistan with high-quality products and preferential prices;

After that, the customer also sent us the installation pictures of the WESDOM product in the working condition project, and feedback that the quality is still very good, and will maintain a long-term cooperative relationship with WESDOM;

Project Pictures:


D343H Hard Seal Butterfly Valve



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