Pneumatic PTFE Sealed Butterfly Valve

Short Description:

The pneumatic PTFE sealed butterfly valve consists of a piston-type pneumatic actuator and a concentric soft-seal butterfly valve. It features simple structure, low flow resistance, nearly linear flow...

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Product Detail

Product Overview

Equipped with travel limit switches, solenoid valves and air filter regulators, the valve realizes on-off operation with air supply pressure of 0.4-0.7MPa, and outputs two sets of passive contact signals to indicate valve status. When fitted with a pneumatic positioner, it can operate by receiving control signals of 4-20mADC or 1-5VDC. This valve is lightweight, easy to install and requires low driving torque. It can be used for both medium shut-off and flow control.

Product Features

Compact and lightweight, easy to disassemble, maintain and install at any position.
Simple and compact structure with low operating torque; it opens rapidly via 90° rotation.
Linear flow characteristic delivers excellent control performance.
Pinless connection between disc and stem eliminates potential internal leakage points.
Spherical outer surface of the disc optimizes sealing performance and extends service life. It maintains zero leakage after over 50,000 times of opening and closing under pressure.
Replaceable sealing parts with reliable bidirectional sealing performance.
The disc can be coated with nylon, PTFE and other materials as required.
Available in wafer and flange connection designs.

Main Technical Parameters

Valve Body

Parameter	Specification
Body Type	Straight-through cast body
Nominal Diameter	DN50～1200mm
Nominal Pressure	PN 0.6, 1.0, 1.6 MPa
Flange Standard	GB, JB, HG, ANSI, JIS
Connection Type	Wafer, Flange
Gland Type	Integrated type
Packing Material	V-type PTFE packing, Flexible graphite packing

Internal Components

Parameter	Specification
Disc Type	Vertical plate (butterfly type)
Flow Characteristic	On-off type: Linear; Control type: Approximate equal percentage

Pneumatic Actuator

Parameter	Specification
Actuator Model	GT, SR, AT, AW, TH(QGSY) series single & double acting pneumatic actuators
Air Supply Pressure	400～700KPa
Air Port Size	G1/4", G1/8", G3/8", G1/2"
Ambient Temperature	-30℃～+70℃
Action Mode	Single acting: Air to Close (B) – Fail Open (FO); Air to Open (K) – Fail Close (FC) Double acting: Air to Close (B) – Fail Locked (FL); Air to Open (K) – Fail Locked (FL)
Optional Accessories	Positioner, Solenoid valve, Air filter regulator, Lock-up valve, Limit switch, Valve position transmitter, Handwheel mechanism, etc.

Note: Please refer to the dedicated page for detailed actuator parameters.

Main Component Materials

No.	Part Name	Material
1	Valve Body	HT200, WCB, CF3, CF3M, CF8, CF8M
2	Seal Ring	PTFE, NBR, Nylon
3	Lower Bushing	Copper alloy, 304, 316
4	Valve Stem	2Cr13, 304, 316, 316L
5	Butterfly Disc	HT200, WCB, CF3, CF3M, CF8, CF8M
6	Upper Bushing	Copper alloy, 304, 316
7	Packing	PTFE / Flexible graphite
8	Packing Gland	25#, 35#, 304, 316

Note: Custom materials are available for harsh working conditions upon request.

Main Performance Index

Item	Parameter
Hysteresis (With positioner)	Less than 2% of full stroke
Basic Error (With positioner)	Less than ±2% of full stroke
Leakage Rate	Complies with ANSI B16.104 Class IV
Adjustable Range (R)	50:1