co-ax valves inc. USA

2/2 Way coaxial Externally Controlled Valves

The 2/2-way externally controlled valves are pneumatically or hydraulically operated valves with two port connections and two switching positions. Actuation of these valves is usually achieved using an installed 5/2-way valve or through an existing valve terminal.

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SIL3 Safety Integrity Level DIN EN 61508

Switching times can be set as desired using throttles on the pilot valve; opening and closing can be delayed up to three seconds to prevent hydraulic pressure surges in pipeline systems. Due to the unique coaxial design, most valves can operate using only 45 psi of instrument air pressure; the air consumption per stroke is sometimes only 1/10 of the value of valves from well-known competitors. By using co-ax® valves, the consumption of expensive compressor air is minimized so that these valves are particularly energy-efficient.

Due to their very high switching force, externally controlled valves can be equipped with additional wiper rings. These valves are ideally suited for sticky or abrasive media such as ceramic slip, glue, paste, paint, or grinding emulsion/oil.

The externally controlled valves are available with nominal orifice sizes of approx. 0.31" to 10". The media pressure range extends from vacuum to 1500 psi. The tightness of the valve seat is guaranteed when control air or hydraulics is applied up to the full pressure rating in accordance with DIN 12266 - regardless of whether the valves are operated in the preferred or the opposite direction. When instrument air or hydraulics is not applied, the seat tightness in the opposite direction is a maximum of 240 psi. Technical details can be found in the respective data sheets. The flow factor (Cv value) ranges from 2.9 to 750 GPM. Depending on the nominal size, the valves are available with port connections that are threaded, flanged or with special designs. This series is available with ATEX Zone 1/Category 2 rating.


The valves can be optionally equipped with features such as a variety of pilot valves, various limit switches, mounting brackets, and a variety of electrical plug connections including M12x1 DESINA/VDMA.

Overview technical data 2/2 Way coaxial Externally Controlled Valves

co-ax type orifice
inch approx.
connection max. pressure range Cv value
CFM 08
0.31" threaded 0-600 psi 1.8 GPM
MCF 08
0.31" threaded 0-1500 psi 1.8 GPM
VMK 10
0.375" threaded 0-1500 psi 2.9 GPM
VMK / VFK 15
0.50" threaded
0-1500 psi 6.6 GPM
VMK / VFK 20
0.75" threaded
0-1500 psi 10.2 GPM
VMK / VFK 25
1.00" threaded
0-1500 psi 15.4 GPM
VMK / VFK 32
1.25" threaded
0-1500 psi 23.1 GPM
VMK / VFK 40
1.50" threaded
0-1500 psi 35.8 GPM
VMK / VFK 50
2.00" threaded
0-1500 psi 49.7 GPM
VSV-M / VSV-F 40
1.50" threaded
0-600 psi 35.8 GPM
VSV-M / VSV-F 50
2.00" threaded
0-600 psi 49.7 GPM
VSV-F 65
2.50" flanged 0-600 psi 78.6 GPM
VSV-F 80
3.00" flanged 0-600 psi 104 GPM
VSV-F 100
4.00" flanged 0-600 psi 161.8 GPM
VSV-F 125
5.00" flanged 0-600 psi 228.9 GPM
VSV-F 150
6.00" flanged 0-600 psi 316.7 GPM
VSV-F 200
8.00" flanged 0-240 psi 520.2 GPM
VSV-F 250
10.00" flanged 0-240 psi 751.4 GPM
FCF 50 – FCF 150
50 – 150 flanged 92.5 GPM
FCF-K 65 – FCF-K 125
65 – 125 flanged 113.3 GPM