矩形人孔是安裝在儲罐頂上的應急通氣裝置，通常與防火器、機械呼吸閥配套使用，既能避免因意外原因造成罐內急劇超壓或真空時，損壞儲罐而發生事故，又有起到阻火作用，是保護儲罐的裝置，特別適用于貯存物料以氮氣封頂的拱頂常壓罐。具有定壓排放、定壓吸入、開閉靈活、阻火、結構緊湊、密封性能好、可靠等優點。

矩形人孔一般由304，316L不銹鋼鋼板或者碳鋼制作而成。

矩形人孔的結構介紹：

由于人孔安裝在油罐的下層體圈上，防滲漏就顯得特別重要。要求兩法蘭結合面保證其平直度，無飄扭現象。加強板和法蘭應盡量在整塊鋼板上切割而不拼接。法蘭和蓋板上加工有密封圈，在施工中要特別注意保護。密封用3mm厚石棉橡膠墊片，不允許有折裂。安裝人孔蓋板上緊螺栓時，要成對角均勻用力，以防孔蓋變形。

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.

產品圖片：矩形人孔常壓人孔不銹鋼矩形 人孔生產廠家

安徽利勒潔凈設備科技有限公司是國內專業生產制造潔凈衛生級閥門管件，主要應用于食品機械行業、制藥機械行業、乳制品行業、釀酒飲料行業以及精細化工等行業高精度衛生級流體設備的專業生產廠家，產品規格齊全；產品主要有：矩形人孔常壓人孔不銹鋼矩形 人孔生產廠家

無菌隔膜閥，卡箍直通隔膜閥，三通隔膜閥，法蘭隔膜閥，氣動隔膜閥，U型隔膜閥，罐底隔膜閥 ；

無菌球閥，卡箍直通球閥，螺紋球閥，焊接球閥，氣動球閥，法蘭球閥，電動球閥；

衛生級蝶閥，焊接蝶閥，卡箍直通蝶閥，螺紋蝶閥，法蘭蝶閥，氣動蝶閥，電動蝶閥；

不銹鋼衛生泵，不銹鋼衛生級離心泵，不銹鋼衛生自吸泵，不銹鋼酒精防爆泵，衛生奶泵，衛生飲料泵；

止回閥，過濾器、呼吸器、換向閥、防混閥、安全閥；

衛生級不銹鋼管件，焊接彎頭，快裝彎頭，不銹鋼三通，快裝三通，四通，真空彎頭，大小頭；

罐頂組件系列，不銹鋼儲罐，發酵罐，不銹鋼衛生級人孔，清洗球/器，視鏡燈，排氣閥等其它非標產品生產加工；

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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.