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What is Bidirectional Butterfly Valve ?

The medium of the one-way butterfly valve can only flow in one direction, but the butterfly plate of the bidirectional butterfly valve can face or face the flow direction of the medium, with two opposite flows. It will not be constrained by the flow of media during installation. The valve realizes the non-slip friction between the butterfly plate seal ring, and the gear pressure angle of the sealing surface exceeds the friction angle. During the opening and closing process, the butterfly plate seal ring can be easily and instantly completed at each point along the 360° circle, step by step contact and point by point release. The closed seal can be combined to conveniently and accurately perform the sealing measures consistent with the open contact.

Advantages of bidirectional butterfly valve

01
TExcellent bidirectional sealing performance and small torque value.
02
Flow characteristics tend to be linear and have good adjustment performance.
03
Flange connection is easy to be installed, whether vertically or horizontally.
04
Diversity of sealing materials for users to choose.
05
The valve can be used as a vent valve at the pipe end with reliable performance.
06
The valve seat seal ring is organically integrated with the valve body, giving the valve a long service life.

Design Standard

API
ASME
ANSI
EN
DIN
GOST
GB
JIS

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The characteristics of bidirectional butterfly valve

The butterfly plate adopts a unique streamlined structural design, and the total thickness does not exceed 2 times the diameter of the valve stem. The butterfly plate has good strength under positive and negative pressure, and will not cause harmful permanent deformation and damage under 1.1 times the maximum allowable pressure difference. The large-diameter butterfly plate adopts a truss structure and has high fluid dynamics characteristics and low flow resistance coefficient.

The connection design between the valve stem and the butterfly plate adopts an eccentric pin structure. The eccentric pin structure improves the stress condition of the connecting pin, greatly improves the shear resistance of the pin shaft, and calculates and checks the load when opening and closing under 1.5 times the maximum pressure difference to ensure that the diameter and number of the pin shaft connecting the butterfly plate and the valve stem meet the transmission requirements.

The valve can realize bidirectional pressure bearing without medium flow direction requirements, and the positive and negative pressure bearing capacity can reach 1:1, which increases the application range of the valve.

When the valve is used in underground pipeline systems such as direct burial and valve wells, the valve operation platform interface can be heightened according to different customer needs.

Technical Parameters
Size	DN15-DN1500, 1/2''-60''
Pressure	PN10-PN420, Class150-Class2500
Temperature	-200°C to 650°C
Connection Type	Flange, Thread, Wafer, Welded
Operation Mode	Manual, Pneumatic, Electric, Hydraulic, Gear operation

Materials
Valve Body	Forged	A105, LF2, F5, F9, F11, F22, F304, F316, F347, F904, F51, F53, F310, N08020, Inconel625, etc
	Cast	WCB, LCB, C5, C12, WC6, WC9, CF8, CF8M, CF8C, 4A, 5A, CN7M, C95800, CW6MC, etc
Valve Stem		F6a, 17-4PH, XM-19, F304, F316, F347, F904, F51, F53, F310, Monel400, Monel500, N08020, Inconel625, Incoloy825, etc.
Valve Disc		A105, LF2, F5, F9, F11, F22, F304, F316, F347, F904, F51, F53, F310, N08020, Inconel625, F6a, 17-4PH, XM-19, F304, F316, F347, F904, F51, F53, F310, Monel400, Monel500，Incoloy825，WCB, LCB, C5, C12, WC6, WC9, CF8, CF8M, CF8C, 4A, 5A, CN7M, C95800, CW6MC, etc.
Seat Sealing		SS, BR, CU, AS, CS, AL, PTFE, NBR, FKM, AI203, etc

Design Standards
Valve Body	API 6D, API 608, ASME B16.34, DIN 3357, BS 5351, GOST 9833, JIS B2071, GB/T 12237, etc.
Flange	ANSI B16.5, EN 1092-1, JIS B2220, GB/T 9113, ASME B16.47, GOST 12821, DIN 2543-2545, etc.
Connection	ANSI B16.10, ASME B16.25, JIS B2212, GOST 33259, DIN 3202, etc.
Test Standards	API 598, ISO 5208, BS EN 12266, ASME B16.104, GOST 9544-2015, JIS B2003, DIN 3230, etc.

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02

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03

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