Ultra High Purity Cylinder Valves

Ultra high purity tied diaphragm cylinder valves in the Rotarex D3 series: manual and pneumatic, single and dual port, metal to metal or soft seat, orifice sizes from 4 mm to 8 mm, with variants for fluorine mixes and low pressure service. Built for the highest purity cylinder gases.

Four decisions. Orifice: 4 mm on the standard high pressure valves, 6 mm for higher flow, 8 mm on the 45 bar low pressure valves. Seat: soft seat as standard, or metal to metal on the D306 and D356 for highly oxidising and reactive gases. Actuation: manual, pneumatic or oleo pneumatic. Ports: the dual port valves serve liquefied gas withdrawal. Fluorine mixes have their own valve, the D386S.

Showing 13 products

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D304 High pressure 4mm orifice Valve - Ultra high purity tied diaphragm seal type by Southern CGSD304 High pressure 4mm orifice Valve - Ultra high purity tied diaphragm seal type by Southern CGS

Ultra high purity tied diaphragm seal type

D304 High pressure 4mm orifice Valve

D304 valve for UHP, corrosive, reactive and toxic gases from Rotarex Puretec is designed for keeping the highest level of purity of the gas. No particles are generated in the gas wetted part thanks to the tied diaphragm technology. It is also available with the new Open/close indicator from Rotarex Puretec

D385S High Pressure Pneumatic Valve soft seat 4mm orifice - Ultra high purity tied diaphragm seal type by Southern CGSD385S High Pressure Pneumatic Valve soft seat 4mm orifice - Ultra high purity tied diaphragm seal type by Southern CGS

Ultra high purity tied diaphragm seal type

D385S High Pressure Pneumatic Valve soft seat 4mm orifice

D385S valve with pneumatic actuator is designed for keeping the highest level of purity of the gas. Its tied diaphragm technology allows to avoid any particle generation. The D385S is used for UHP, corrosive, reactive and toxic gases, common in the electronic and semicondutor industry.

D386S Tied diaphragm cylinder valve for fluorine mixtures with pneumatic actuator - Ultra high purity tied diaphragm seal type by Southern CGSD386S Tied diaphragm cylinder valve for fluorine mixtures with pneumatic actuator - Ultra high purity tied diaphragm seal type by Southern CGS

Ultra high purity tied diaphragm seal type

D386S Tied diaphragm cylinder valve for fluorine mixtures with pneumatic actuator

The D386S ensures the highest levels of purity and safety for applications using fluorine gas mixtures, such as cleaning non-plasma deposition chambers and diffusion furnaces for silicon-based films. Designed with the challenges of fluorine-nitrogen mixtures in mind, this UHP cylinder valve incorporates specialized features to enhance operational safety and maintain the purity of F₂/N₂ mixtures, supporting contamination-free manufacturing

D354 Oleo-Pneumatic Soft seat 4mm orifice valve - Ultra high purity tied diaphragm seal type by Southern CGSD354 Oleo-Pneumatic Soft seat 4mm orifice valve - Ultra high purity tied diaphragm seal type by Southern CGS

Ultra high purity tied diaphragm seal type

D354 Oleo-Pneumatic Soft seat 4mm orifice valve

D354 valve with oleo-pneumatic actuator is designed for keeping the highest level of gas purity. No particle are generated thanks to its tight diaphragm technology. Commonly used for ultra-high-purity, corrosive, reactive and toxic gases, its oleo-pneumatic actuator increase the seat closure force.

D340S Dual Port UHP valve Soft seat 4mm orifice valve - Ultra high purity tied diaphragm seal type by Southern CGSD340S Dual Port UHP valve Soft seat 4mm orifice valve - Ultra high purity tied diaphragm seal type by Southern CGS

Ultra high purity tied diaphragm seal type

D340S Dual Port UHP valve Soft seat 4mm orifice valve

D340S valve for Ultra-High Purity gases from Rotarex Puretec is designed for keeping the highest level of purity of the gas. The dual port technology ease withdrawal of liquefied gas by pressurizing through vapour port. No particles are generated in the gas wetted part thanks to the tied diaphragm technology.

D306 High pressure Metal / Metal sealing 3.5mm orifice valve - Ultra high purity tied diaphragm seal type by Southern CGSD306 High pressure Metal / Metal sealing 3.5mm orifice valve - Ultra high purity tied diaphragm seal type by Southern CGS

Ultra high purity tied diaphragm seal type

D306 High pressure Metal / Metal sealing 3.5mm orifice valve

D306 cylinder valve for Ultra High Purity highly oxidizing and reactive gases is designed for keeping the highest level of gas purity, thanks to its tied diaphragm technology. The Rotarex Puretec D306 UHP cylinder valve is also available with the new Open/close indicator.

D356 Oleo-pneumatic valve Metal / Metal sealing 3.5mm orifice - Ultra high purity tied diaphragm seal type by Southern CGS

Ultra high purity tied diaphragm seal type

D356 Oleo-pneumatic valve Metal / Metal sealing 3.5mm orifice

The D356 UHP cylinder valve with oleo-pneumatic actuator is designed for Ultra High Purity highly oxidizing and reactive gases, ensuring the highest level of gas purity thanks to its tied diaphragm technology. Its oleo-pneumatic actuator increases the seat closure force for maximum safety.

D339S High pressure manual valve Soft seat 6mm orifice - Ultra high purity tied diaphragm seal type by Southern CGSD339S High pressure manual valve Soft seat 6mm orifice - Ultra high purity tied diaphragm seal type by Southern CGS

Ultra high purity tied diaphragm seal type

D339S High pressure manual valve Soft seat 6mm orifice

D339S valve is designed for keeping the highest level of purity of UHP, corrosive, reactive and toxic gases. No particles are generated in the gas wetted part thanks to the tied diaphragm technology. The D339S is also available with the new Open/close indicator from Rotarex Puretec.

D389S Oleo-Pneumatic Soft seat 6mm orifice valve - Ultra high purity tied diaphragm seal type by Southern CGS

Ultra high purity tied diaphragm seal type

D389S Oleo-Pneumatic Soft seat 6mm orifice valve

D389S UHP cylinder is designed for keeping the highest level of purity of the gas. The seat closure force is increased thanks to its oleo-pneumatic actuator. The tight diaphragm technology allows no particle are generation in the gas wetted parts.

D349 Dual Port UHP valve Soft seat 6mm orifice - Ultra high purity tied diaphragm seal type by Southern CGS

Ultra high purity tied diaphragm seal type

D349 Dual Port UHP valve Soft seat 6mm orifice

D349 valve for UHP gases is designed for keeping the highest level of purity of the gas. Easy withdrawal of liquefied gas thanks to the dual port technology. The D349 allows a high flow value at high pressure with its 6mm orifice size.

D337 Tied-diaphragm seal Low Pressure 8mm orifice valve - Ultra high purity tied diaphragm seal type by Southern CGSD337 Tied-diaphragm seal Low Pressure 8mm orifice valve - Ultra high purity tied diaphragm seal type by Southern CGS

Ultra high purity tied diaphragm seal type

D337 Tied-diaphragm seal Low Pressure 8mm orifice valve

D337 low pressure manual cylinder valve for Ultra High Purity, corrosive, reactive and toxic gases is designed for keeping the highest level of purity of the gas, thanks to the tied diaphragm technology. The D337 valve is also available with the Rotarex puretec Open/close indicator for an improved safety.

D387 Pneumatic actuator Low Pressure 8mm orifice valve - Ultra high purity tied diaphragm seal type by Southern CGSD387 Pneumatic actuator Low Pressure 8mm orifice valve - Ultra high purity tied diaphragm seal type by Southern CGS

Ultra high purity tied diaphragm seal type

D387 Pneumatic actuator Low Pressure 8mm orifice valve

D387 low pressure pneumatic cylinder valve for UHP, corrosive, reactive and toxic gases is designed with the tied-diaphragm in order to keep the highest level of purity of the gas. Its 8mm orifice size allows a high CV value.

D342 Dual Port UHP valve Soft seat 8mm orifice valve - Ultra high purity tied diaphragm seal type by Southern CGSD342 Dual Port UHP valve Soft seat 8mm orifice valve - Ultra high purity tied diaphragm seal type by Southern CGS

Ultra high purity tied diaphragm seal type

D342 Dual Port UHP valve Soft seat 8mm orifice valve

D342 low pressure valve for Ultra-High Purity corrosive, reactive and toxic gases is designed for keeping the highest level of purity of the gas, thanks to the tied diaphragm technology. The D342 dual ported valve has two outlets marked “LIQUID” to withdraw liquid phase and “VAPOR” for gas phase.

Common questions

What is a tied diaphragm cylinder valve?
The seat is tied to the diaphragm, so the diaphragm both seals the gas away from the stem and carries the seat that opens and closes the flow. That gives a very small internal volume, a positive opening action, and no packing to leak or to shed particles. Every valve in this range uses it, tested to a leak rate of 1 x 10-8 mbar litres per second helium.
What is the difference between a soft seat and a metal to metal seat?
A soft seat uses a polymer seat face, which seals tightly at a low closing force and suits most ultra high purity gases. A metal to metal seat has no polymer anywhere in the gas path, which is what highly oxidising and reactive gases need. The two are separate versions rather than options on one part number, so the seat is decided at the point of order.
What is a dual port cylinder valve for?
A dual port valve provides two separate flow paths through one valve body, and in this range that is for withdrawal from liquefied gas cylinders. It saves fitting two valves to one cylinder and keeps both paths under one head. Two of the valves in this range are dual port and the rest are single port.

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