electric and hydraulic inside screw knife gate valve

New product overview
This knife gate valve is a new generation gate valve characteristic of small construction, low weight, and high material utilization. It is an ideal product for such sectors including sewage disposal, coal slurry, syrup, sludge, air, slag-water mix, water supply, papermaking, mining, etc.
The knife gate valve adopts metal-to-metal hard sealing or metal-to-rubber soft sealing. In the processing of valve switching on/off, the gate plate and sealing face are provided with special design, featuring limited friction and high durability.
The sealing of the knife gate valve represents a breakthrough in traditional sealing form. Upper cap structure changes large area rectangular sealing face of the upper sealing to small area circular sealing, with much enhanced sealing performance. Based on circular sealing, the valve is further provided with latest floating sealing construction (see Figure 1) in the world. Thus the upper sealing shares the same useful life with pipeline, so the overall useful life of the valve increases.
After envelope is added to the top of hand wheel, all the moving parts of the gate valve will be enclosed. Therefore, the rotation of lead screws between gate plate and stem will not block because of short supply of lubricating oil. In particular, the valve is applicable for long-term service in severely dusty and dry environment (see Figure 2). Note: The valve could be designed and manufactured based on client’s site conditions and requirements for better installation and application.

Design and manufacture:JB/T8691-1998
structural length: GB/T15188.2-94
Flange connection: GB/T9113.1-2000 JB/T79-94
testing and acceptance: GB/T13927-92

Key parts material

Valve body, upper cap	Carbon steel, stainless steel
Valve plate	stainless steel
Stem	stainless steel
Seal ring	Rubber, PTFE, stainless steel,hard alloy

Key performance indicators

Nominal pressure	PN
Casing test	1.5XPN
Leak test	1.1XPN
Operating temperature	Rubber ≤80℃, PTFE≤180℃, hard sealing ≤425℃
Working medium	paper pulp, sewage, coal slurry

Profile and connection dimension                                           Unit:mm

Nominal pressure（MPa）	Nominal through 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	Electric type optional
	1200		1450	1380	1325	3360	32-M36
	1400		1675	1590	1525	3920	36-M39
	1600		1915	1820	1750	4480	40-M45