Swagelok® Relief Valves
Swagelok® proportional relief valves provide overpressure protection in general industrial applications with a variety of set pressures available. Bleed and purge valves provide effective bleeding, venting, or draining of signal line pressure to atmosphere.
View Relief ValvesSwagelok® R series proportional relief valves open gradually as pressure increases, providing simple, reliable overpressure protection, protecting workers, and helping to maintain proper process conditions. Set pressures can be configured at the factory or easily adjusted in the field to suit changing operating conditions. Swagelok® RV series medium-pressure relief valves can be used in applications with operating pressures up to 20 000 psig (1378 bar).
Swagelok® PRV series proportional safety relief valves are certified to PED 2014/68/EU Category IV and CE-marked in accordance with the Pressure Equipment Directive as a safety valve according to ISO-4126-1. They are factory-set, tested, locked, and tagged with the set pressure.
Swagelok® BV series bleed valves can be used on instrumentation devices such as multivalve manifolds or gauge valves to allow safe removal of instruments and to assist in the calibration of control devices. They are available with low emission (Low-E) certification according to API 624 to combat fugitive emissions.
Swagelok® P series purge valves are manual bleed, vent, or drain valves. Knurled caps are permanently assembled to valve bodies for safety, and both bleed and purge valves are compact for convenient installation.
Want to know more about relief, bleed, or purge valves?
Relief Valve Categories
Bleed and Purge Valves, BV and P Series
Experience convenient installation with compact bleed valves for instrumentation devices and purge valves, such as manual bleed, vent, or drain valves.
Medium-Pressure Relief Valves, RV Series
Ensure over-pressure protection in general-industry applications with set or adjustable pressure and lock nut for stability.
Proportional Relief Valves, R3, R4, RL3, and RL4 Series
Discover high- and low-pressure proportional relief valves that open gradually as pressure increases. Suitable for liquid or gas service.
Proportional Safety-Relief Valves, PRV Series
Provides flexible, reliable over-pressure protection, certified under PED 2014/68/EU Category IV, and CE-marked according to ISO-4126-1.
Spare Parts and Accessories
Find spare parts and accessories for relief valves, including spring kits, seal kits, handle kits, insert kits, and poppet kits for optimal performance.
Relief Valves Catalogs
Locate detailed product information, including materials of construction, pressure and temperature ratings, options, and accessories.
Features: Gas and liquid service; Working pressure: 6000 psig (413 bar); Set pressures from 145 to 6000 psig (10.0 to 413 bar); All 316L stainless steel construction; 1/4 through 1 in. NPT and ISO/BSP parallel thread end connections; Certified to PED 97/23/EC Category IV
Bleed Valves: Working pressures up to 10 000 psig (689 bar); Temperatures up to 850°F (454°C); 316 stainless steel, carbon steel, alloy 400, or alloy C-276 materials. Purge Valves: Working pressures up to 4000 psig (275 bar); Temperatures up to 600°F (315°C); 316 stainless steel, brass, or carbon steel materials
Features: Liquid or gas service; Set pressures from 10 to 6000 psig (0.68 to 413 bar); 1/4 and 1/2 in. and 6 to 12 mm end connections
Swagelok offers pressure-reducing, back-pressure, dome-loaded, and spring-loaded pressure regulators to control pressure and minimize droop in instrumentation systems.
Swagelok® offers medium- and high-pressure fittings, tubing, valves, and related accessories with temperatures up 1000°F (537°C), pressure ratings up to 60 000 psig (4134 bar) in sizes ranging from 1/4 to to 1 in. for medium-pressure products and 1/4 to 9/16 in. for high-pressure products. NACE® MR0175/ISO15156 compliance is available.
Calculate Flow Rate for the Right Valve Selection
Use our valve flow coefficient (Cv) calculator to chose a valve sized correctly for your needs.
Use the ToolSwagelok Resources Curated for You
How to Select the Right Valves for Your Industrial Fluid System
Learn how to apply the practical STAMPED method to select the valves most suited to your industrial fluid or sampling system design applications.
Minimize the Costs of Fugitive Emissions with Low-E Valves
Fugitive emissions are a growing concern in the chemical and petroleum refining industry. Certified low-emissions (Low-E) valves can protect your facility and bottom line. Learn what they are, how they are tested, and how they can help you in this post.
ブロック・バルブで一般産業用流体システムを遮断する方法
一般産業用流体システムのメンテナンスを行う際は、プラントの安全を確保するため、事前にラインを遮断する必要があります。流体システム・ラインを安全に遮断できる方法のひとつは、2個のブロック・バルブを並べて取り付ける方法です。今回は、システムに最適な構成を設計する方法を紹介します。
1つの新しいバルブが半導体製造を変える3つの理由
今回は、原子層蒸着（ALD）バルブの最新テクノロジーが、ハイテク半導体メーカーにもたらす影響について紹介します。
圧力逃がし弁／ブリード･バルブ／パージ・バルブ
圧力逃がし弁
圧力逃がし弁 Rシリーズは、液体やガスの幅広い一般産業用アプリケーションにおいて、シンプルかつ確実に過剰圧からシステムを保護します。設定圧力範囲は0.07～41.3 MPaです。圧力が高くなると徐々に開き、システム圧力が設定圧力を下回ると閉じます。設定圧力は工場で設定することも可能ですが、現場で容易に調節することも可能です。圧力逃がし弁 PRVシリーズは、PED 2014/68/EU Category IVの認証を取得しており、Pressure Equipment Directive（圧力機器指令）に従い、ISO-4126-1準拠の安全弁としてCEマークを取得しています。工場で圧力設定を行い、試験を行って固定してから、設定圧力を明示したタグを付けています。
ブリード･バルブ／パージ・バルブ
Swagelok ブリード・バルブは、マルチバルブ・マニホールドやゲージ・バルブのような計装装置に使用でき、計器を取り外す前のシグナル・ラインの圧力の大気中への排出や、制御装置の校正補助を行います。エンド・コネクションのタイプは、NPTおねじとSAEねじから選ぶことができます。Swagelok パージ・バルブは、手動式のブリード・バルブ、ベント・バルブ、ドレン・バルブです。エンド・コネクションのタイプは、NPTねじ、SAEねじ、Swagelokチューブ継手、チューブ・アダプターから選ぶことができます。安全性を高めるため、バルブ・ボディから外れないようにきざみ付きキャップを取り付けています。ブリード･バルブ、パージ・バルブ共にコンパクトで、取り付けに便利です。