The Pressure Switch valves are operated by the pressure applied to the sense port acting on a piston opposing an adjustable spring force. 3 way valve is a block and bleed valve.It functions as either a normally closed or normally open valve, depending on through which port the instrument pressure is supplied. These ports are marked as ‘HI IN’ or ‘LO IN’ on the switch body. The output port, marked ‘OUT’ on the switch body, is the same for either mode of operation.
«316 stainless steel construction (models to NACE MR-0175 available).
«Special materials such as Inconel® 625 , Incoloy® 825 are available, suitable for high-sulfur service conditions
«Hydraulic and Pneumatic service.
«Designed for 1% plus or minus repeatability on set point.
«Minimum dead band between trip and reset, about 5%.
«High and low pressure valve manifolds are available
| Product code | Body material | Piston size | Spring code | Piston size2（assemble） | Spring code2（assemble） | Valve type | Nace mr-0175 |
| PSVM | SS- | 2 | R | 3 | G | -3A | -N1 |
| PSVM-valve | SS-316SS | 1-0.22in | R-red | 1-0.22in | R | 3A-3WAY | empty-NO |
| PSAM-valve assemble | A625-Inconel® 625 | 2-0.56in | B-black | 2-0.56in | B | 2A-2WAY-NO | N1- -18~120℃，yes |
| A825-Incoloy® 825 | 3-1.25in | G-green | 3-1.25in | G | 2B-2WAY-NC | N2- -40~120℃，yes | |
| M400-monel 400 | P-purple | P | |||||
| H276-HC-276 | |||||||
| For special requirement please contact the Sales Department. | |||||||
| Piston Code & Size Matching Table | |||
| Spring code & color | Piston code 1 (0.22 in. / 5.6mm) pressure range | Piston code 2 (0.56 in. / 14.3mm) pressure range | Piston code 3 (1.13 in. / 28.6mm) pressure range |
| R (Red) | 10000~6000 psig (689~414 bar) | 1500~750 psig (103~51.7 bar) | × |
| B (Blue) | 6000~3000 psig (414~207 bar) | 900~400 psig (62~27.6 bar) | 200~80 psig (13.8~5.5 bar) |
| G (Green) | 3000~1500 psig (207~103 bar) | 450~200 psig (27.6~13.8 bar) | 100~30 psig (6.9~2 bar) |
| P (Purple) | × | × | 45~10 psig (3.1~0.7 bar) |