Fisher 634 EYM Overpressure Shut-off Valve
Rp123000.00
The Fisher 634 EYM is a high-pressure shut-off valve designed to provide overpressure protection by containment in gas systems. Manufactured by Emerson under the Fisher brand, this valve is part of the 634 Series and is engineered to stop the flow of gas or liquid under overpressure conditions without venting to the atmosphere. The 634 EYM model features external pressure registration, requiring a control line, and is typically installed upstream of a pressure-reducing regulator. Its design ensures positive shutoff, application versatility, and easy maintenance, making it suitable for various industrial applications.
Technical Specifications
Parameter | Details |
Manufacturer/Brand | Emerson / Fisher |
Series | 634 Series |
Type | High-Pressure Shut-Off Valve with External Registration (634M) |
Body Size | 3/4" or 1" NPT |
Maximum Inlet Pressure | 1500 psig / 103 bar |
Maximum Outlet Pressure | 1500 psig / 103 bar |
Pressure Registration | External (requires control line) |
Temperature Range | -40°F to 180°F / -40°C to 82°C |
Approximate Weight | 10 lbs / 4.5 kg |
Shatter Pressure Options | 20–28 psig (Red), 50–60 psig (Yellow), 72–88 psig (White) |
Body Material | Cast Iron |
Bonnet Material | Aluminum |
Diaphragm Material | Nitrile |
Plug Assembly | Elastomeric seat for tight shutoff |
Applications | Overpressure protection in gas systems, upstream of regulators |
