Manual Lug Type Knife Gate Valve - Knowledge

The manual lug-type knife gate valve adopts a two-piece structure, including the valve body, gate, and U-shaped sealing strip. Grooves with elastic U-shaped sealing strips are located on both sides of the valve body and at the bottom of the central cavity. When the valve is closed, the gate moves downward, and the bottom of the gate contacts the sealing strip, compressing it into the groove to achieve a seal between the valve body and the gate.

When the knife gate valve is opened, the gate moves upward, and the bottom edge of the gate disengages from the sealing strip, causing the sealing strip to spring up and become flush with the groove. The valve body features a scraper design to prevent media sediment from accumulating in the grooves of the valve body's central cavity during use, preventing blockages and residues, facilitating pipeline cleaning, and effectively improving the sealing performance of the knife gate valve to prevent leakage when the valve is closed.

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manual lug-type knife gate valve Technical parameters

Size Range:2″ to 24″ (DN50-DN600)

Connection Options: Lug

Working Pressure:PN6/PN10/PN16

Working Temperature:-29°C to 425°C

Sealing Options:Metal-to-Metal, Resilient Seat, Graphite, PTFE

Manufacturing Method:Cast, Forged, Machined

Applicable Medium:Water, Oil, Gas, Steam, Chemical Fluids

Features of Manual Lug-Type Knife Gate Valve:

1. The knife gate valve consists of a narrow valve body and a sliding gate.

2. The gate has sharp cutting edges that can displace or cut solid particles in the fluid medium.

3. The polished surface of the gate enhances its penetrating power and effectively protects the service life of the packing and valve seat.

4. A gate clamping device is installed at the bottom of the valve body, which can safely support and press the gate against the valve seat, ensuring a tight and effective closure.

5. Its structure can be made with either a hard seal or a soft seal.

manual lug-type knife gate valve Specification Parameters

PN (MPa)	Case Test Pressure (MPa)	Seal Test Pressure (MPa)	Working Temperature (°C)	Applicable Medium
1.0	1.5	1.1	Rubber ≤ 80°C	Pulp, sewage, coal slurry, ash, syrup, slag–water mixture
1.6	2.4	1.8	≤ 425°C	Pulp, sewage, coal slurry, ash, syrup, slag–water mixture

Component	Material
Body, Cover	Stainless steel, carbon steel, gray cast iron
Gate	Carbon steel, stainless steel
Stem	Stainless steel
Sealing Surface	Rubber, PTFE, stainless steel, hard alloy

manual lug-type knife gate valve drawning

Manually operated wafer gate valve drawings customized for a customer in the UAE

manual lug-type knife gate valve Main External and Connection Dimension

PN (MPa)	DN (mm)	L	D	D1	D2	H	N–M	D0	Weight (kg)
1.0	50	48	160	125	100	285	4–M16	180	8
	65	48	180	145	120	298	4–M16	180	10
	80	50	195	160	135	315	4–M16	220	12
	100	50	215	180	155	365	8–M16	220	14
	125	57	245	210	185	400	8–M16	230	22
	150	57	280	240	210	475	8–M20	280	29
	200	70	335	295	265	540	8–M20	360	38
	250	70	390	350	320	630	12–M20	360	66
	300	76	440	400	368	780	12–M20	400	100
	350	76	500	460	428	885	16–M20	400	119
	400	89	565	515	482	990	16–M22	400	195
	450	89	615	565	532	1100	20–M22	530	285
	500	114	670	620	585	1200	20–M22	530	389
	600	114	780	725	685	1450	20–M27	600	529
	700	130	895	840	800	1700	24–M27	600	790
	800	130	1010	950	905	2000	24–M30	680	-
	900	140	1110	1050	1005	2300	28–M30	680	-
PN (MPa)	DN (mm)	L	D	D1	D2	H	N–M	D0	Weight (kg)
1.6	50	48	160	125	99	285	4–M16	180	8.5
	65	48	185	145	118	295	4–M16	180	10.7
	80	50	200	160	132	315	8–M16	220	13
	100	50	220	180	156	365	8–M16	220	15
	125	57	250	210	184	400	8–M16	230	23.5
	150	57	285	240	211	475	8–M20	280	31
	200	70	340	295	266	540	12–M20	360	40.7
	250	70	405	350	319	630	12–M24	360	70
	300	76	460	400	370	780	12–M24	400	107
	350	76	520	460	429	885	16–M24	400	129
	400	89	580	515	480	990	16–M27	400	215
	450	89	640	565	548	1100	20–M27	530	305
	500	114	715	620	609	1200	20–M30	530	410
	600	114	840	725	720	1450	20–M33	600	550
	700	130	910	840	794	1700	24–M33	600	820
	800	130	1025	950	901	2000	24–M33	680	-
	900	140	1125	1050	1001	2300	28–M36	680	-

manual lug-type knife gate valve Applications

Manually operated full-lug knife gate valves have wide applications in various industrial sectors, including:

Oil and Gas Industry: In oil fields and gas wells, these valves are used to control the flow of crude oil, natural gas, and water. They play a crucial role in oil and gas production and transportation systems, ensuring the safety and efficiency of the production process.
Chemical Industry: Imported manually operated full-lug knife gate valves are used in chemical plants to control the flow of various chemical media. They can withstand corrosive substances and high-temperature, high-pressure environments.
Power Industry: In thermal power plants and nuclear power plants, these valves are used to control the flow of steam and cooling water to maintain the stable operation of the power generation system.
Water Treatment Industry: Imported manually operated full-lug knife gate valves used in water supply and wastewater treatment plants help control the flow in water supply and treatment processes, ensuring that water quality meets standards.
Marine Engineering: In marine engineering projects, such as subsea pipelines and offshore platforms, these valves are used to control the flow of seawater and media to maintain the stability of the facilities.

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