Curtiss-Wright Farris Pressure Safety and Relief Valves - Protect pressure vessels, boilers, pipelines and process equipment with reliable overpressure protection.
Aura Safety supports the selection and supply of Curtiss-Wright Farris pressure safety valves and pressure relief valves through its critical safety equipment supply services for industrial process, utility and steam applications.
We work with plant engineers, HSE teams, EPC contractors and procurement professionals to review operating conditions, project specifications and documentation requirements before identifying a suitable valve configuration for technical evaluation.
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A pressure safety valve or pressure relief valve is an automatic mechanical safety device designed to open when system pressure reaches a predetermined set point. By discharging excess process fluid, the valve helps prevent pressure from exceeding the allowable limits of the protected equipment.
Aura Safety supports enquiries involving pressure safety and relief valves used to protect personnel, assets and surrounding operations against the consequences of overpressure, including equipment damage, loss of containment and unplanned shutdowns.
Aura Safety supports Farris valve enquiries for applications across industries such as:
Our experience in process safety services, risk management and engineering consultancy helps us understand both the technical specification and the wider safety importance of each pressure-relief application.
Aura Safety supports enquiries for Curtiss-Wright Farris pressure-relief products used in process, utility and steam service.
The appropriate valve type, size, materials and configuration must be selected according to the process medium, operating conditions, required relieving capacity, backpressure, applicable code and approved project specification.
A direct spring-loaded valve uses a calibrated spring to hold the valve disc against its seat during normal operation. When inlet pressure reaches the specified set pressure, the force created by the system pressure causes the valve to open and discharge the process medium.
After system pressure falls sufficiently, the spring closes and reseats the valve.
Available configurations may include:
Conventional spring-loaded valves are widely used for general overpressure protection. Their operation can be affected by built-up or superimposed backpressure, so the complete installation must be considered during selection.
Balanced designs are intended to reduce the effect of backpressure on valve performance. Depending on the selected construction, a bellows or other balancing arrangement may also help isolate certain internal components from the discharge medium.
These valves may be considered when an application involves variable backpressure, corrosive discharge conditions or operating requirements that make a conventional design unsuitable.
Material compatibility, bellows limits and inspection requirements must be confirmed for the specific service.
A pilot-operated relief valve uses system pressure and a separate pilot mechanism to control the opening and closing of the main valve.
Pilot-operated designs may be considered for applications involving:
Suitability depends on the process medium and service conditions. Fluid cleanliness, viscosity, temperature, corrosion potential and the design of the pilot-sensing arrangement must all be evaluated.
The operation of a direct spring-loaded pressure safety valve can be understood in three stages.
The spring applies a closing force to the disc, holding it against the nozzle seat and keeping the valve sealed during normal operation.
As inlet pressure rises, it creates an upward force on the disc. When the valve reaches its specified opening condition, the disc lifts and allows gas, vapour, steam or liquid to discharge through the outlet.
Once system pressure has decreased sufficiently, the spring force closes the valve. The difference between the opening pressure and the pressure at which the valve reseats is commonly described as blowdown.
The precise opening, discharge and reseating behaviour depends on the valve design, service medium and applicable standard.
The terms pressure safety valve, or PSV, and pressure relief valve, or PRV, are sometimes used differently across industries, companies and technical standards.
In general industry usage:
These descriptions should not be used as the sole basis for valve selection. The final selection must be based on the service medium, required capacity, set pressure, operating characteristics, applicable code and manufacturer documentation.
A typical spring-loaded pressure-relief valve includes:
The construction and materials of these components must be compatible with the pressure, temperature, process medium and environmental conditions.
Pressure-relief valve selection and sizing require complete and reliable process data. An undersized valve may not provide the required relieving capacity, while an oversized or incorrectly installed valve may operate unstably or experience chattering.
To help us review your enquiry, please provide the following information where available:
For replacement valve enquiries, please also share:
Replacement selection should not be based only on matching connection dimensions. Capacity, materials, pressure ratings, operating characteristics and code requirements must also be confirmed.
Depending on the application and project requirements, pressure-relief valve selection may involve standards and requirements such as:
The applicable code edition, certification, documentation and inspection scope should be defined in the purchase specification.
Where required and available for the selected product and supply scope, documentation may include material certificates, test certificates, drawings, datasheets and inspection records. Any third-party inspection requirement should be identified at the enquiry stage.
Farris pressure safety and relief valves may be used to protect:
Final suitability must always be confirmed against current Curtiss-Wright Farris documentation, applicable codes and the approved project specification.
We review the available process data and project requirements to help identify a suitable Farris valve configuration for detailed technical evaluation.
Our team helps reduce specification ambiguity and supports communication between procurement teams, plant engineers and relevant product representatives.
We help clarify the documentation, inspection and certification requirements that should form part of the valve enquiry and purchase specification.
A pressure-relief valve is one part of a complete overpressure-protection system. Its performance depends on correct scenario identification, sizing, inlet and outlet piping design, discharge-system behaviour, installation and maintenance.
Aura Safety can also support related process-safety and engineering requirements, including:
Our multidisciplinary safety and engineering consultancy services enable us to support technically demanding requirements across process, energy and manufacturing industries in India.
Pressure-relief valves should be inspected, tested and maintained through a documented programme based on:
A universal testing interval should not be applied to every valve. The appropriate frequency must be established for the specific service and jurisdiction.
Warning signs such as seat leakage, corrosion, deposits, unstable operation or evidence of an unrecorded lift event should be investigated by competent personnel. Valves should only be isolated, removed, repaired, calibrated and returned to service under an approved maintenance procedure.
Send us your valve datasheet, purchase specification or existing valve details.
Aura Safety will review the available information and coordinate the next steps for selecting and sourcing a suitable Curtiss-Wright Farris pressure safety or pressure relief valve.
To receive a more accurate technical and commercial response, include the process conditions, required relieving capacity, connection details, material requirements, applicable standards and documentation scope with your enquiry. You can also explore Aura Safety’s wider range of industrial safety services.
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No. PSVs should only be fixed by certified technicians. If you fix it wrong, it might not open during an emergency. Look for a shop with a "VR" (Valve Repair) stamp.
This is the pressure used to test a valve on a bench at room temperature. Because metal gets weaker when hot, the test pressure at the shop might be slightly different than the "set pressure" in a hot factory.
The lever is there so you can manually open the valve. This lets you check if the moving parts are stuck. It is usually used for steam or air valves.
With good care, a PSV can last 20 to 30 years. However, the soft parts (like seals) usually need to be replaced every few years.
Corrosion is the biggest enemy. If the chemicals in your pipes eat away at the metal or the spring, the valve will fail. Always choose the right material, like stainless steel, for harsh chemicals.
A Pressure Safety Valve (PSV) is a spring-loaded automatic valve installed on pressurized vessels, pipelines, or equipment to protect against overpressure. When process pressure reaches the valve's set pressure, the spring force is overcome and the valve disc lifts — releasing excess pressure to a safe location (flare, vent, or drain). Once pressure drops to the reseating pressure, the spring forces the disc closed automatically. No external power or manual intervention is required.
A PSV (Pressure Safety Valve) opens instantly with a pop action and is designed for gas, steam, and vapor service. A PRV (Pressure Relief Valve) opens gradually and modulates flow — it is designed for liquid service. The terms are sometimes used interchangeably, but specifying the wrong type for your service fluid can lead to chattering, seat damage, or inadequate relief. The combined term Safety Relief Valve (SRV) describes valves suitable for both gas and liquid service.
For most industrial applications in the US and internationally, PSVs should carry ASME Section VIII certification (indicated by the UV or UV1 stamp) and comply with API 526 design requirements. For boilers, ASME Section I (V stamp) is required. In India, IBR approval is mandatory for steam boilers. European projects require PED (Pressure Equipment Directive) compliance and CE marking. Always request the test certificate and certification documentation with your purchase order.
Most regulatory frameworks and industry best practices recommend testing PSVs every 12 to 24 months, depending on service severity and the fluid handled. Valves in corrosive or fouling service may require more frequent testing. Testing must be performed on a calibrated test bench, and results — including the set pressure, seat leakage (per API 527), and blowdown — must be documented and retained for regulatory audit. Aura Safety can assist in arranging third-party valve testing and recertification.
Simmering or weeping from a PSV is most often caused by fouling or grit on the seat/disc lapping surfaces, incorrect set pressure relative to operating pressure (the valve should be set at least 10% above normal operating pressure to prevent premature lift), or seat damage from previous chattering. Aura Safety recommends inspecting and re-lapping the seat if the valve has been in service more than two years, or replacing the internals if the seat damage is severe.
Chattering — rapid, repetitive opening and closing — typically occurs when the PSV is oversized for the relieving flow, when the inlet pressure drop to the valve exceeds 3% of set pressure, or when the valve's blowdown is set too tightly. Chattering causes rapid seat wear and valve failure. Proper sizing (per API 520) and correct inlet piping design (per API 520 Part II) prevent chattering. Contact our engineers if you are experiencing chattering on an installed valve.
For standard spring-loaded PSVs in common sizes (15mm–100mm) and standard materials (WCB, SS316), Aura Safety typically dispatches within 3–7 business days from order confirmation. Custom sizes, special materials (Inconel, Hastelloy, PTFE-lined), or valves requiring specific third-party certification may require 2–4 weeks. Contact us with your project timeline and we will confirm a committed delivery date.
A spring-loaded valve uses a calibrated mechanical spring as its primary closing force. A pilot-operated valve uses system pressure and a separate pilot mechanism to control the main valve. The preferred design depends on pressure, temperature, fluid properties, backpressure, required tightness and operating margin below set pressure.
A balanced design may be considered when backpressure could materially affect the operation of a conventional spring-loaded valve. The allowable backpressure and suitability of the balancing arrangement must be checked against current manufacturer data.
Yes. Share the existing valve nameplate, manufacturer, model, serial number, photographs, process conditions and project specification. These details help determine whether a suitable replacement can be identified.
Provide the process medium, operating and relieving conditions, set pressure, required capacity, backpressure, connection details, materials, applicable standards and documentation requirements. A completed valve datasheet is preferred whenever available.
The model number is helpful, but it may not be sufficient. The existing valve’s nameplate data, capacity, materials, pressure class, service conditions and current project requirements should also be verified.
Testing frequency should follow applicable legal and code requirements, manufacturer guidance, service conditions, maintenance history and the facility’s inspection programme. Severe, corrosive, fouling or polymerising service may require closer monitoring than clean, stable service.
Aura Safety can review the data supplied with an enquiry and coordinate the technical selection process. Final sizing and suitability must be confirmed using the governing relief scenario, applicable code, approved process data and current manufacturer procedures.
