Anderson Greenwood Safety Relief Valves & Instrumentation

Anderson Greenwood Series 200 Pilot-Operated Modulating Safety Relief Valves

Anderson Greenwood Series 200 pilot-operated safety relief valves are engineered for process vessels, separators, and piping systems requiring continuous proportional overpressure protection.

The modulating pilot mechanism opens the main valve disc only as much as necessary to relieve system overpressure, preventing piping chatter, flow oscillation, and destructive water hammer.

The non-flowing pilot architecture restricts media movement through the pilot loop during relief cycles, significantly reducing atmospheric emissions and icing risks during gas expansion.

Series 200 valves guarantee tight shutoff up to 95–98% of set pressure and remain completely unaffected by superimposed backpressures without requiring expensive balancing bellows.

Set pressures 1.0 to 425 barg, non-flowing modulating pilot, ASME Class 150–2500 ratings, temperature limits -59 to +260 °C.

Anderson Greenwood Series 400 Pop-Action Pilot-Operated Safety Relief Valves

Anderson Greenwood Series 400 pop-action pilot-operated safety valves provide instantaneous full-bore capacity relief for compressible fluids including hydrocarbon gases, dry gases, and compressed air.

Upon reaching set pressure, the snap-acting pilot rapidly vents dome pressure above the main valve piston, causing the main disc to snap instantaneously to full lift. This rapid full-stroke kinematic achieves certified flow capacity immediately upon overpressure onset.

Resilient polymer soft seats (PTFE, PEEK, Kel-F) ensure bubble-tight seat shutoff even in severe vibration environments downstream of large gas reciprocating compressors and pump stations.

Set pressure 1.0–425 barg, snap-acting full-lift relief, controlled blowdown 5–10%, resilient soft seats.

Anderson Greenwood Series 500 Severe Service Pilot-Operated Safety Valves

The Series 500 represents Anderson Greenwood heavy-duty modulating pilot-operated valves engineered for severe service environments across refining, hydroprocessing, and chemical synthesis units.

Built with integrated self-cleaning pilot impulse strainers and dirt-tolerant piston seals, they resist plugging from particulates, coking, and scaling.

Valve bodies are fabricated from forged and cast alloy steels (including 316SS, duplex, and super duplex) with stellite hardfacing, maintaining reliable pressure relief capability during aggressive thermal transients, slurry contamination, and severe cyclic loading.

Pressures up to 425 barg, pilot impulse filtration, NACE MR0175 sour gas compliance, FFKM perfluoroelastomer seals.

Anderson Greenwood Series 700 High-Temperature & Steam Safety Relief Valves

Anderson Greenwood Series 700 high-temperature pilot safety relief valves are engineered for utility power steam boilers, superheated steam headers, and two-phase flashed flows.

Fully dual-certified under ASME Boiler and Pressure Vessel Code Section I (Power Boilers) and Section VIII (Unfired Vessels), these valves employ an isolated pilot standoff mounting that protects pilot internals from extreme process conduction.

Patented aerodynamic nozzle profiles reduce thermodynamic cutting and sonic acoustic erosion on seat sealing boundaries during continuous discharge.

Operating steam temperatures up to +538 °C, dual ASME Section I & VIII code stamped, Inconel X-750 alloy springs.

Anderson Greenwood Series 800 Low-Pressure & Cryogenic LNG Safety Relief Valves

The Series 800 delivers dedicated pilot-operated relief protection for ultra-low pressures and deep cryogenic conditions across LNG storage tanks, liquefaction trains, FSRU vessels, and ethylene terminals.

These valves reliably control minute set pressures starting from a few millibars, safeguarding thin-walled bulk atmospheric and cryogenic vessels against both catastrophic overpressurization and vacuum collapse.

Polymer engineering ensures full sealing elasticity and low-friction piston movement under cryogenic liquid methane temperatures down to -196 °C.

Set pressures 5 mbarg (2 in wc) to 3.4 barg, cryo rating to -196 °C, reverse flow pilot options, nozzle sizes to 12" (DN 300).

Anderson Greenwood Series 90 & 900 Direct Spring-Operated Safety Valves

Anderson Greenwood Series 90 and 900 valves represent proven direct spring-operated overpressure safety technology.

Engineered for applications where regulatory guidelines or process economics dictate robust spring mechanics without auxiliary pilot circuits, these valves protect shell-and-tube heat exchangers, pump discharge lines, and gas processing skids.

Standardized dimensions conform directly to API Standard 526 center-to-face dimensions, facilitating seamless retrofitting of legacy valves without modifying existing pipeline spool pieces.

API 526 and ASME Section VIII compliant, nozzle orifices D through T, RF/RTJ flanges, WCB, 316SS, and Monel metallurgy.

Anderson Greenwood Instrumentation 2-, 3-, and 5-Valve Manifolds (M24, M25, MC)

Anderson Greenwood Instrumentation manifolds deliver precision isolation, venting, and equalization manifolds for differential pressure, gauge pressure, and absolute pressure transmitters.

The product matrix comprises 2-valve, 3-valve, and 5-valve configurations for standard DIN/pipe mounting and direct Coplanar™ integration with Rosemount transmitter sensor modules.

The proprietary below-the-threads stem packing arrangement isolates operating threads from process media and prevents lubricant washout, ensuring smooth low-torque actuation and gall-free service life over decades.

Operating pressure up to 414 bar (6000 psig) and 690 bar (10,000 psig), direct transmitter mount, forged 316/316L, Grafoil packing.

Anderson Greenwood Primary Isolation Monoflanges & Keyblok DBB Valves

Anderson Greenwood primary isolation monoflanges and Keyblok double block and bleed valves replace cumbersome fabricated tree hookups comprising multiple discrete ball valves, flanges, and piping nipples.

Mounting directly to the process tapping flange, the monoflange consolidates primary isolate, secondary isolate, and bleed needle valves within a single compact forged body.

This engineered integration cuts installation weight and overhung physical length by up to 80%, radically mitigating pipe vibration stress and eliminating potential external leak paths.

ASME Class 150 to 2500 flanges, 1/2" to 3" bore, Fire-Safe certified to ISO 10497 / API 607, Duplex, Inconel 625, Hastelloy C276 alloys.

Anderson Greenwood Tank Blanketing Regulators & Series 9300 Pilot Tank Vents

Anderson Greenwood tank protection systems provide comprehensive low-pressure safety for atmospheric bulk storage vessels holding crude oil, fuels, solvents, and chemicals.

Tank blanketing regulators feed inert blanket gas (nitrogen) into the vapor headspace during liquid pump-out, preventing oxygen ingress and explosive atmosphere generation.

During thermal expansion or vessel pump-in, Series 9300 pilot-operated tank relief vents open to relieve excess vapors, maintaining high seat tightness and drastically reducing product evaporation losses compared to direct-weight pallet vents.

Sub-millibar blanketing sensitivity, Series 9300 pilot vapor venting, aluminum and stainless steel housings, sizes to 12".

Genuine Anderson Greenwood Rebuild Kits, Pilot Trim & Soft Seat Sets

To maintain overpressure safety integrity throughout long plant turnaround cycles, SpareX delivers genuine factory Anderson Greenwood spare parts and complete valve overhaul kits.

Our inventory includes precision soft seat inserts (PTFE, PEEK, Kel-F, FKM, Kalrez), factory-calibrated set springs, stem assemblies, dome diaphragms, pilot trim rebuild cartridges, and full pilot assemblies.

Utilizing genuine Emerson components guarantees certified flow coefficients, original factory setpoint repeatability, and bubble-tight shutoff across all process pipelines.

Soft seat overhaul kits, complete replacement pilot valves, diaphragms, calibrated springs, cross-referenced by Serial Number.