Threaded Welded Butt Welded Forged Steel Gate Valve

Threaded Welded Butt Welded Forged Steel Gate Valve

Forged steel gate valve （Description）

The opening and closing parts of high temperature and high pressure welding gate valve are rigid solid gate, the direction of movement of the gate plate is perpendicular to the direction of the fluid, which can be fully open or closed. The valve body is forged as a whole, which is very suitable for high temperature and high pressure working conditions. Gate valve fluid resistance is small, sealing surface by the medium of erosion and erosion is small, open and close less effort, medium flow is not restricted, not disturbing flow, not reducing pressure, simple body, short structure length, good manufacturing technology, wide range of application.

Operating principle

The high temperature and high pressure welding gate valve adopts the pressure self-tightening sealing structure, the higher the pressure of the inner cavity, the better the sealing performance. The two ends of the branch pipe are welded to meet the different requirements of the nozzle. The sealing surface of gate and valve seat is made of stellite cobalt base hard alloy surfacing, which is wear-resistant, high temperature resistant, corrosion resistant and abrasion resistant. The valve stem has good corrosion resistance and abrasion resistance after tempering and surface nitriding treatment. The structure of the opening and closing parts can be designed into different forms such as single board, double board and parallel double board according to user requirements. Welded gate valve is suitable for the nominal pressure of 42.0Mpa working temperature ≤600℃ of petroleum, chemical, thermal power station and other working conditions of the pipeline, cut off or connect the medium.

Product features

★The inner cavity adopts the pressure self-tightening sealing structure, the higher the pressure of the inner cavity, the better the sealing performance. The two ends of the branch pipe are welded to meet the different requirements of the nozzle.

★The sealing surface of gate and valve seat is made of stellite cobalt-based hard alloy surfacing and sports seal with high hardness, wear resistance, high temperature resistance, corrosion resistance, abrasion resistance and long service life.

★Stem TEMPERED AND SURFACE NITRIded – EXCELLENT RESISTANCE to corrosion and abrasion.

Forged steel gate valves are available in three cover designs. It is bolted valve cover. According to this design, the valve body and valve cover are connected with bolts and nuts, and the wound gasket (316 clamp flexible graphite manufacturing) is sealed. When customers have special requirements, they can also use metal ring connection. The second design form is welded valve cover, according to this design form of the valve, the valve body and valve cover with thread connection, fully welded seal. Full penetration connection can also be used when customers have special requirements. The third is the pressure self-tightening valve cover, according to this design form of the design of the valve, its body and valve cover thread connection, internal pressure self-sealing ring seal.

NO	Name	CS to ASTM	AS to ASTM	SS to ASTM
		Type A105N	Type F22	Type F304(L)	Type F316(L)
1	Valve body	A105N	A182 F22	A182 F304(L)	A182 F316(L)
2	Valve seat	A276 420	A276 304	A276 304(L)	A276 316(L)
3	Wedge Disc	A182 F430/F410	A182 F304	A182 F304(L)	A182 F316(L)
4	Valve rod	A182 F6a	A182 F22	A182 F304(L)	A182 F316(L)
5	Gasket	316With flexible graphite		316夹PTFE
6	Valve deck	A105N	A182 F22	A182 F304(L)	A182 F316(L)
7	Valve deck bolt	A193 B7	A193 B16	A193 B8	A193 B8M
8	Cylindrical pin	A276 420		A182 F304
9	Gland	A276 410		A182 F304(L)	A182 F316(L)
10	Eyelet bolt	A193 B7	A193 B16	A193 B8	A193 B8M
11	Gland flange	A105	A182 F11	A182 F304(L)	A182 F316(L)
12	Screw nut	A194 2H	A194 4	A194 8	A194 8M
13	Valve rod Screw nut	A276 420
14	Locknut	A194 2H	A194 4	A194 8	A194 8M
15	Nameplate	SS
16	Handwheel	A197
17	Lubricating gasket	A473 431
18	Padding	Flexible graphite		PTFE
Applicable medium		Water, steam, oil, etc.	Water, steam, oil, etc.	Nitric acid, acetic acid, etc
Applicable temperature		-29°C～425°C	-29°C～550°C	-29°C～200°C

※Note: Other materials required by customers can also be used. The matching of sealing surface materials is determined by the internal part code specified by the customer.

CS=carbon steel; AS=alloy steel; SS=stainless steel;

Size (mm) and weight (Kg)

NPS	Hole shrinkage	3/8	1/2	3/4	1	11/4	11/2	2	/
	Full-opening	/	3/8	1/2	3/4	1	11/4	11/2	2
L		79	79	92	111	120	120	140	178
H（开）		158	158	169	197	236	246	283	330
W		100	100	100	125	160	160	180	200
Weight	Bolt type	2.1	2.0	2.3	4.3	5.9	6.9	11.1	15.2
	weldeding	1.8	1.7	2.0	3.8	5.1	6.1	10.2	14.2