SPM N2安全阀
SPM可提供两种类型的氮气安全阀，可重复式背压阀和倾卸式全孔卸载阀。
概述
Weir SPM氮气驱动安全阀有两种类型：背压安全阀和全孔卸载阀。 SPM EXL背压安全阀是SPM背压式安全阀的下一代产品。 该阀的特点是具有螺纹体，外观更紧凑，改变了内部功能，提高了适用性。N2安全阀可重新起动，排气后也可以继续运行。
SPM® EXL背压安全阀的特点：
•螺纹阀体到阀盖接合处，提高安全系数。
•通道式设计，旨在减少阀门的紊流，并减少可能导致不当密封的砂砾堆积。 该设计还可以更好地引导流体通过密封接口并排出排放口。
•气缸杆具有二次密封，可以提供额外的保护，以防止加压流体绕过主密封件的和阀盖总成通电。
•密封组件更易于安装，可取代传统的尼龙衬套支撑杆。该密封组件还提供更好的杆对准，改善正常阀循环中的密封。
与SPM®EXL背压安全阀不同，N2全孔卸载阀和应急排放阀运行方式一样，直到泵系统关闭并且阀被复位才保持打开状态。N2全孔卸载阀是操作员在超压事件后想要完全关闭系统的理想选择。
全孔卸载阀的特点：
•完全打开阀门排放以立即减压。
•压盖式密封，更容易抵消处理线脉动引起的阀门振动。
•阀帽可保护氮气软管免受损坏。
两种阀门的尺寸都为3英寸，操作压力高达15,000 psi。
应用
•压裂
•油井服务
流程
•完井
•油气生产
关于Weir集团
Weir集团雇有约 14,000 名员工，在 70 多个国家/地区开展业务，致力于为具有良好长期发展前景的市场提供服务。集团拥有成熟可靠的专业知识和技术，能够在全球各地的矿场加工自然资源，也帮助从世界一些严苛作业环境中出产石油与天然气。集团与客户紧密合作，在矿业、石油与天然气、电力与工业市场上为其提供可以提高效率并降低运营成本的产品和服务。
无论客户在何时何地需要我们，我们都竭力满足其需求，致力于成为值得客户信赖的首选合作伙伴。
关于鼎恒石油
四川鼎恒石油是Weir SPM的授权代理商，若需要购买SPM产品或需要了解产品详细参数及相关疑问，可直接进入鼎恒石油官网咨询网站客服或者拨打销售热线18000522697。
四川鼎恒石油机械设备有限公司(http://www.dinghengot.com)是一家拥有进出口经营权，长期从事国内外石油天然气设备和配件的专业销售公司。鼎恒石油公司总部设在四川成都，在加拿大大不列颠哥伦比亚省成立了分公司。我公司与多家世界知名制造厂商建立了紧密的合作关系。
注：该文章由鼎恒石油编译，转发须注明出处。
附英文原文：
SPM® N2 Relief Valves
SPM® offers nitrogen relief valves in two styles, a reseatable backpressure valve and a dump-style full bore unloading valve.
Overview
Weir SPM® nitrogen actuated relief valves come in two versions: a backpressure relief valve and a full bore unloading valve. The SPM® EXL backpressure relief valve is the next generation in SPM’s back pressure relief valve offering. The valve features a threaded body, more compact envelope and changes to internal features that improve serviceability. This valve is able to reseat, making it possible to continue operation after the valve has vented.
The SPM® EXL backpressure relief valve features include:
l Threaded body-to-bonnet engagement for increased safety.
l A channeled spider designed to reduce turbulence in the valve and reduce potential for sand accumulation that can lead to improper sealing. This design also better directs fluid through the seal interface and out the discharge outlet.
l A cylinder rod with a secondary seal for additional protection from pressurized fluid bypassing the primary seals and energizing the bonnet assembly.
l An easier-to-install packing assembly that replaces the legacy nylon bushing supporting rod. This packing assembly also offers better rod alignment, improving sealing in normal valve cycling.
Unlike the SPM® EXL backpressure relief valve, the N2 full bore unloading valve operates as a dump valve, remaining open until the pump system is shut down and the valve is reset. The N2 full bore unloading valve is ideal for operators who want full system shutdown after an overpressure event.
Full bore unloading valve features include:
l Fully open valve discharges for immediate pressure relief.
l Gland style seal that is more forgiving of valve chatter caused by pulsations in treating line.
l Cap guards that protect nitrogen hoses from damage.
Both valves come in a 3-inch size for operating pressures up to 15,000 psi.
Applications
l Fracking
l Well Service
Processes
l Well completions
l Oil and gas production
