Product Overview of DMZ73H Manual Hidden Rod Knife Gate Valve
This knife shaped gate valve is a new variety of gate valves, with small volume, light weight, and lightweight materials. It is an ideal product for industries such as sewage, coal slurry, syrup, mud, air, slag water mixture, water supply, papermaking, mining, etc.
Knife gate valves use metal to metal hard seals or metal to rubber soft seals. During the opening and closing process, the gate and sealing surface are designed with special features, resulting in minimal friction and durability.
The upper seal of this type of knife shaped gate breaks through the conventional sealing form by adopting an upper cover structure, which changes the upper seal from a large rectangular seal to a small circular seal, greatly improving the sealing performance. On the basis of the circular seal, the advanced floating seal currently used internationally has been replaced with an area based circular seal, greatly improving the sealing performance. On the basis of circular sealing, the currently advanced floating sealing structure internationally (see Figure 1) is also adopted, which enables the upper seal to reach the same lifespan as the pipeline, thereby improving the overall service life of the valve.
After installing a sealing device on the top of the handwheel, this type of gate valve can keep all the moving parts of the valve in a closed state, and the screw drive of the gate and valve stem will not get stuck due to dry lubricating oil.
Especially suitable for long-term normal operation in harsh environments with dust and dryness (see Figure 2). Note: It can be designed and produced according to the environment and requirements of the user, suitable for installation and use by the user.

Design and Manufacturing: JB/T8691-1998
Structural length: GB/T15188.2-94
Flange connection: GB/T9113.1-2000 JB/T79-94
Testing and acceptance: GB/T13927-92

Main component materials of DMZ73H manual concealed stem knife shaped gate valve

Valve body, upper cover	Carbon steel, stainless steel
Valve plate	stainless steel
valve stem	stainless steel
sealing ring	Rubber, PTFE, stainless steel, hard alloy

Main performance specifications for DMZ73H manual concealed stem knife gate valve

nominal pressure	PN
Shell Test	1.5XPN
Sealing test	1.1XPN
operation temperature	Rubber ≤ 80 ℃ PTFE seal ≤ 180 ℃ Hard seal ≤ 425 ℃
Applicable Medium	Pulp, sewage, coal and gas, etc

DMZ73H manual concealed stem knife shaped gate valve main appearance and connection dimensions Unit: mm

Nominal pressure (MPa)	Nominal diameter (mm)	L	D	D1	D2	H	N-M	D0
1.0	150	70	280	240	210	475	8-M20	280
	200	80	335	295	265	540	8-M20	360
	250	85	390	350	320	630	12-M20	360
	300	100	440	400	368	480	12-M20	400
	350	100	500	460	428	885	16-M20	400
	400	110	565	515	782	990	16-M22	400
	450	120	615	565	532	1100	20-M22	530
	500	130	670	620	585	1200	20-M22	530
	600	140	780	725	685	1450	20-M27	600
	700	165	895	840	800	1700	24-M27	600
	800	190	1010	950	905	2000	24-M30	680
	900	200	1110	1050	1005	2300	28-M30	680
	1000		1220	1160	1150	2780	28-M33	Equipped with electric power
	1200		1450	1380	1325	3360	32-M36
	1400		1675	1590	1525	3920	36-M39
	1600		1915	1820	1750	4480	40-M45