Fluid Control Valve Expert

It is a specialized valve manufacturer integrating design and development, production, sales, and service. The company specializes in producing turbine inlet ball valves, turbine inlet butterfly valves, eccentric hemispherical valves, hydraulically controlled check butterfly valves, needle valves, high-pressure air valves, and various centerline butterfly valves...

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Flanged ball valve

Flange ball valve

A flanged ball valve is a rotary shut-off valve installed in piping systems via flanged connections. Its core component is a spherical body (ball) with a through‑hole, which is rotated 90° by a handle or an actuator to rapidly open or close the fluid flow path. Thanks to its compact design, excellent sealing performance, and straightforward operation, it is widely used in industries such as water treatment, petroleum, chemical processing, and HVAC.

Category:

Ball Valve

Keywords:

Flanged ball valve

E-mail:

sales@wolsvalve.com

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Detailed description

Product Overview

A flanged ball valve is a rotary shut-off valve installed in piping systems via flanged connections. Its core component is a spherical body (ball) with a through‑hole, which is rotated 90° by a handle or actuator to rapidly open or close the fluid flow path. Thanks to its compact design, excellent sealing performance, and straightforward operation, it is widely used in industries such as water treatment, petroleum, chemical processing, and HVAC.

Core Working Principle

Flanged ball valves belong to the category of quarter-turn valves (rotating 90°):
Open state: The axis of the spherical through-hole coincides with the pipeline axis, allowing fluid to pass with virtually no resistance.
Closed position: The ball rotates 90°, with the axis of the through-hole perpendicular to the pipeline axis, achieving a tight seal and shut-off through the close contact between the ball’s surface and the valve seat.

Main structural components

Part Name	Function Description
Valve body	The pressure-bearing body is typically a cast or forged structure, with flanges at both ends.
Sphere	The core closing member is typically chrome-plated or coated with a hard alloy to enhance wear resistance.
Valve seat	Sealing assemblies commonly use materials such as PTFE (polytetrafluoroethylene), PPL (para‑phenylene), or metal hard seals.
Valve stem	It connects the actuator to the ball and transmits torque, typically incorporating a blowout-proof design.
Flanged end	It is used for对接 with pipe flanges and is secured with bolts, facilitating installation and removal.

Key Performance Features

● Extremely low flow resistance: The flow passage diameter of a full-bore ball valve is essentially the same as that of the pipeline, resulting in minimal pressure loss.
● Reliable sealing: Soft-seated ball valves can achieve zero leakage (typically compliant with ANSI VI standards), while hard-seated designs are suitable for high-temperature, high-pressure service conditions.
● Convenient operation: Simply rotate 90° to fully open or fully close, making it ideal for automated control (compatible with pneumatic or electric actuators).
● Simple maintenance: Modular design; certain components allow for on‑line replacement of the valve seat or packing.

Main classification methods

Classification dimension	Common types	Applicable Scenarios
Structural form	Floating ball valve, fixed ball valve (trunnion-mounted)	Floating balls are suitable for small-diameter, low-pressure applications; fixed balls are suitable for large-diameter, high-pressure applications.
Channel Type	Full bore, reduced bore	Full bore is used for pigging or low‑pressure‑drop applications; reduced bore is used in cost‑sensitive scenarios.
Sealing material	Soft seal (PTFE), metal hard seal	Soft seals are used for ambient-temperature clean media; hard seals are used for high-temperature applications (>250°C) or media containing solid particles.
Valve body structure	One-piece / Two-piece / Three-piece	Three-piece design for easy maintenance and cleaning / One-piece design with lower cost

Key Considerations for Selection and Application

● Pressure rating: Select PN10/16/25 (Chinese standard) or Class 150/300 (American standard) based on operating conditions.
● Media compatibility: For corrosive media, stainless steel (304/316) or valves with special alloy bodies must be selected; for gas service, an antistatic design is required.
● Temperature range: Soft-seated valves are typically limited to –20°C to 200°C; for operating conditions outside this range, metal‑sealed or high‑temperature polymer seats should be selected.
● Connection standards: Pay attention to flange standards (such as GB/T, ANSI, DIN) and the type of sealing face (RF raised face, FF flat face).

Commonly Used Standards

● Design and Manufacturing: GB/T 12237, API 6D, API 608
● Flanged connections: GB/T 9113, ASME B16.5
● Pressure testing: GB/T 13927, API 598

Soft-sealed ball valve

Serial Number No.	Part name	Serial Number No.	Part name
01	Valve cover	10	Gland Range
02	Gasket	11	Gland packing sleeve
03	Valve seat	12	Packing
04	Nut	13	Positioning Plate Stopper
05	Bolt	14	O-ring O-ring
06	Sphere Ball	15	Thrust washer Gasket
07	Antistatic device	16	Bolt
08	Valve Body	17	Lock nut
09	Valve stem	18	Handle

Hard-sealed ball valve

Serial Number No.	Part name	Serial Number No.	Part name
1	Valve cover	12	O-ring O-ring
2	Gasket	13	Right block Grinhold
3	O-ring O-ring	14	O-ring O-ring
4	Spring washer	15	Thrust washer Gasket
5	Valve seat	16	Valve body
6	Nut	17	Right-end packing
7	Bolt	18	Gland
8	Sphere Ball	19	Bolt
9	Antistatic device	20	Positioning Plate Stopper
10	Valve stem	21	Snap ring
11	Valve Disc Seat	22	Handle

Serial Number No	Part name	Material
1	Valve bonnet	Carbon steel, stainless steel
2	Nut	B7, A3, 45#, stainless steel
3	Gasket	Metal gasket PTFE
4	Stud	B7, 35CrMoA, stainless steel
5	Valve Body	Carbon steel, stainless steel
6	Valve seat	Carbon steel, stainless steel, PTFE
7	Sphere Ball	Stainless steel
8	Valve stem	Stainless iron, stainless steel
9	Packing	Graphite, PTFE
10	Gland Packing	Carbon steel, stainless steel
11	Screw nail	35#, stainless steel
12	Locating piece	Q235A, stainless steel
13	Retaining ring	65Mn, stainless steel
14	Handle Wrench	Carbon steel, stainless steel

Main Dimensions Table (mm)

Nominal pressure	Size	Dimensions(mm)
	DN	L	D(JB)	D (HG)	C	g	T(HG)	T(JB)	H	n-φ
PN16	15	130	95	95	65	45	14	14	78	4-14
	20	140	105	105	75	55	16	14	84	4-14
	25	150	115	115	85	65	16	14	95	4-14
	32	165	135	140	100	78	18	16	150	4-18
	40	180	145	150	110	85	18	16	150	4-18
	50	200	160	165	125	100	19	16	190	4-18
	65	220	180	185	145	120	20	18	195	4-18
	80	250	195	200	160	135	20	20	215	8-18
	100	280	215	220	180	155	22	20	250	8-18
	125	320	245	250	210	185	22	22	285	8-18
	150	360	280	285	240	210	24	24	370	8-23
	200	400	335	340	295	265	26	26	370	8-23

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Hard-sealed eccentric flanged butterfly valve

This butterfly valve employs an advanced triple‑eccentric hard‑seal conical bevel‑cutting process and features a floating valve seat and thrust ring, enabling the seat to automatically adjust to the optimal sealing position under media pressure. The thrust ring is designed as a three‑piece assembly secured with set screws, allowing omnidirectional adjustment of the sealing specific pressure between the sealing surfaces and facilitating manual sealing adjustment.

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