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矩形人孔是安装在储罐顶上的应急通气装置，通常与防火器、机械呼吸阀配套使用，既能避免因意外原因造成罐内急剧超压或真空时，损坏储罐而发生事故，又有起到阻火作用，是保护储罐的装置，特别适用于贮存物料以氮气封顶的拱顶常压罐。具有定压排放、定压吸入、开闭灵活、阻火、结构紧凑、密封性能好、可靠等优点。

矩形人孔一般由304，316尝不锈钢钢板或者碳钢制作而成。

矩形人孔的结构介绍：

由于人孔安装在油罐的下层体圈上，防渗漏就显得特别重要。要求两法兰结合面保证其平直度，无飘扭现象。加强板和法兰应尽量在整块钢板上切割而不拼接。法兰和盖板上加工有密封圈，在施工中要特别注意保护。密封用3尘尘厚石棉橡胶垫片，不允许有折裂。安装人孔盖板上紧螺栓时，要成对角均匀用力，以防孔盖变形。

Rectangular manhole is an emergency ventilation device installed on the top of the storage tank. It is usually used with fire extinguishers and mechanical breathing valves. It can avoid accidents caused by sudden overpressure or vacuum in the tank due to accidents, and damage to the storage tank. It has a fire retardant effect and is a device to protect the storage tank, especially suitable for the vaulted atmospheric tank with nitrogen topped by the storage material. It has the advantages of constant pressure discharge, constant pressure suction, flexible opening and closing, fire resistance, compact structure, good sealing performance, and reliability.

Rectangular manholes are generally made of 304, 316L stainless steel plate or carbon steel.

Introduction to the structure of the rectangular manhole:

Since the manhole is installed on the lower body circle of the oil tank, leakage prevention is particularly important. The joint surface of the two flanges is required to ensure its flatness and no twisting. Reinforcing plates and flanges should be cut on the whole steel plate as far as possible without splicing. The flange and cover plate are processed with sealing rings, so special attention should be paid to protection during construction. 3mm thick asbestos rubber gasket is used for sealing, no cracks are allowed. When installing the manhole cover plate to tighten the bolts, force evenly at diagonal angles to prevent the manhole cover from deforming.

产物图片：矩形人孔常压人孔不锈钢矩形 人孔生产厂家

安徽利勒洁净设备科技有限公司是国内专业生产制造洁净卫生级阀门管件，主要应用于食品机械行业、制药机械行业、乳制品行业、酿酒饮料行业以及精细化工等行业高精度卫生级流体设备的专业生产厂家，产物规格齐全；产物主要有：矩形人孔常压人孔不锈钢矩形 人孔生产厂家

无菌隔膜阀，卡箍直通隔膜阀，叁通隔膜阀，法兰隔膜阀，气动隔膜阀，U型隔膜阀，罐底隔膜阀 ；

无菌球阀，卡箍直通球阀，螺纹球阀，焊接球阀，气动球阀，法兰球阀，电动球阀；

卫生级蝶阀，焊接蝶阀，卡箍直通蝶阀，螺纹蝶阀，法兰蝶阀，气动蝶阀，电动蝶阀；

不锈钢卫生泵，不锈钢卫生级离心泵，不锈钢卫生自吸泵，不锈钢酒精防爆泵，卫生奶泵，卫生饮料泵；

止回阀，过滤器、呼吸器、换向阀、防混阀、安全阀；

卫生级不锈钢管件，焊接弯头，快装弯头，不锈钢叁通，快装叁通，四通，真空弯头，大小头；

罐顶组件系列，不锈钢储罐，发酵罐，不锈钢卫生级人孔，清洗球/器，视镜灯，排气阀等其它非标产物生产加工；

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Anhui Lile Clean Equipment Technology Co., Ltd. is a domestic professional manufacturer of clean and sanitary valve and pipe fittings, which are mainly used in the food machinery industry, pharmaceutical machinery industry, dairy industry, wine and beverage industry, and fine chemical industries. Manufacturer with complete product specifications; the main products are:

Aseptic diaphragm valve, clamp straight-through diaphragm valve, three-way diaphragm valve, flange diaphragm valve, pneumatic diaphragm valve, U-shaped diaphragm valve, tank bottom diaphragm valve;

Aseptic ball valve, clamp straight-through ball valve, threaded ball valve, welded ball valve, pneumatic ball valve, flanged ball valve, electric ball valve;

Sanitary butterfly valve, welded butterfly valve, clamp straight-through butterfly valve, threaded butterfly valve, flange butterfly valve, pneumatic butterfly valve, electric butterfly valve;

Stainless steel sanitary pump, stainless steel sanitary centrifugal pump, stainless steel sanitary self-priming pump, stainless steel alcohol explosion-proof pump, sanitary milk pump, sanitary beverage pump;

Check valve, filter, respirator, reversing valve, anti-mixing valve, safety valve; rectangular manhole atmospheric pressure manhole stainless steel rectangular manhole manufacturer

Sanitary stainless steel pipe fittings, welded elbows, quick-installed elbows, stainless steel tees, quick-installed tees, crosses, vacuum elbows, large and small ends;

Tank top assembly series, stainless steel storage tanks, fermentation tanks, stainless steel sanitary manholes, cleaning balls/devices, mirror lights, exhaust valves and other non-standard products production and processing;

We serve you wholeheartedly.