Pneumatic on-off globe valves

Product: Pneumatic on-off globe valves

Introduction

The opening and closing part of the pneumatic on-off globe valve is a plug-shaped valve disc and the sealing surface is a plane or a conical surface.  The valve disc moves linearly along the center line of the fluid. Considering the flow characteristics, pneumatic on-off globe valves have the characteristics of short opening and closing stroke, fast speed, reliable sealing, and small opening and closing torque.

How pneumatic cylinder works

The cylinder of the pneumatic on-off globe valve can be divided into single-acting and double-acting according to the mode of action. The single-acting product is equipped with a reset cylindrical spring, which has the function of automatic reset after degassing, that is, the cylinder piston is driven by the spring to return to the initial position of the cylinder (the original position of the stroke) under the action of the spring.

The double-acting cylinder has no return spring, and the advance and retreat of the push rod must rely on changing the position of the inlet and outlet of the air source of the cylinder. When the air source enters from the upper cavity of the piston, the push rod moves downward. When the air source enters from the lower cavity of the piston, the push rod moves upward. Because there is no return spring, the double-acting cylinder has a larger thrust than the single-acting cylinder of the same diameter, but does not have the automatic reset function.

Different intake positions cause the pushrod to move in different directions. When the intake position is in the back cavity of the push rod, the intake air advances the push rod, which is called a positive-acting cylinder. On the contrary, when the intake position is on the same side of the push rod, the intake air makes the push rod retreat, which is called a reaction cylinder. pneumatic globe valves generally use single-acting cylinders because they generally need gas loss protection.

Features :

1. Simple structure, easy manufacture and maintenance;

2. The medium used in the cylinder is compressed air or nitrogen, which is safe and environmentally friendly;

3.  Cylinder uses the intake chamber or the lower chamber inlet to control valves remotely;

4. Short working stroke and short opening and closing time;

5. The sealing surface of the closing body (valve) and the valve seat adopts a conical seal, which has a small closing force, is resistant to scouring, and has a reliable seal;

6. The valve seat can be a replaceable valve seat, which can be arbitrarily combined and matched with the sealing surface material of the closing member to meet the requirements of working conditions and extend the service life.

Product parts and materials:

Serial number	name	Material
		Carbon steel	Stainless steel
1	Valve body	A216-WCB	A351-CF8
2	Gasket	Flexible graphite + stainless steel	PTFE
3	bolt	A193-B7	A276-304
4	Disc	A216-WCB + surfacing 304 or stellite , PTFE	A351-CF8 PTFE
5	Split ring	A182-F304	A276-304
6	Disc cover	A182-F304	A276-304
7	Stem	A276-410	A276-304
8	Nut	A194-2H	A276-304
9	Eyebolt	A192-2H	A276-304
10	cap	A216-WCB	A351-CF8
11	bolt	A194-2H	A276-304
12	Gasket	A194-2H	A276-304
13	Packing	Flexible graphite	PTFE
14	Gland	A216-WCB	A351-CF8
15	Nut	A194-2H	A276-304

Specification

Valve Size	DN40-DN450 , 1 1/2 '' -18''
Valve Pressure	PN 0.6 Mpa – 10.0 Mpa, Class 150 – class 600
Air Supply	2.5 bars -8 bars, Max 10 bars
Cylinder Stroke	90mm-1030mm
Function	On-off, quick opening and closing, emergency shut-down , flow regulation
Suitable media	Water, oil, gas, air, particles, etc
Working temperature	-40 ℃ to 450 ℃
Ambient temperature	-20°C to 90°C
Optional accessories	solenoid valve, positioner, limit switch, filter, regulator, lubricator, etc

FAQ:

1.    Q: Do you have any certification for Pneumatic on-off globe valvess?

A: Yes, it is certified by ISO 9001 and SIL Level 3.

2.    Q: Can I get one free sample to try in my market?

A: Sorry, such sample should be charged firstly but can be returned after the regular orders .

3,  Q: Can you customize our design and logo for Pneumatic on-off globe valves?

A: Yes, we can do ODM and OEM for all customers.

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