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Gate Valve Series

• API 600 Cast Steel Gate Valve
• API 602 Forged Steel Gate Valve
• API 603 Cast Stainless Steel Gate Valve
• AWWA Resilient Seated Gate Valve
• Knife Gate Valve
• Bellows Seal Gate Valve
• Pressure Seal Gate Valve
• Cryogenic Gate Valve
• Slab Gate Valve
• Cast Iron Gate Valve

Product drawing»

Structural drawing»

Z40/540/940H/Y Cast Steel Pressure Self-tight Gate Valve

product drawing

The features and advantages

The handwheel is made of malleable iron, shape with the hand, and appropriately increase friction, is easy to open. It can also choose impact handwheel.
Stem nut uses high nickel ductile iron, "T"-shaped thread and the stem pass moments together.
There are thrust ball bearings and oil cup in the bonnet, it can add solid lubricant regularly, reduce the hoisting torque, maintain open and close easily. Packing gland and sleeve are designed separately to ensure the concentricity of the stem.
The design of stuffing box is reasonable. Using the combination of knitting graphite, flexible graphite packing and the middle packing sleeve, to ensure the valve without external leakage and in line with environmental requirements.
The connection of body and bonnet uses pressure seal self-tight structure, wedge-shaped sealing ring and four open-loop combination. the higher pressure , the more reliable seal.
The stem top is whole forged, connects disc through “T”-groove, ensure the intensity.
Seat uses welding structure, and the sealing face is welded by carbide alloy, which ensure safe and reliable to work long time.
Disc adopts cast steel disc and flexible disc. It has a certain flexible compensation in the high pressure operating conditions, amd makes the seal more reliable.

Easy torque transmission structure

The impact handwheel or handwheel transmits the torque to stem through the stem nut. The stem is forged and quenched and tempering treated by A182F6 (1Cr13), and the hardness to HB220 ~ 250. In order to reduce power losses in the transmission process, stem nut uses high nickel ductile iron A439GR.D2 or copper alloy (high nickel ductile iron with a certain degree of self-lubrication), whose hardness is about HB50 smaller than the stem.
The thrust bearings can be added in the upper and lower stem nut of the Large-caliber, high-pressure valve. Meanwhile it has the oil cup structure, in which we can add solid fats, to maintain lubrication, so that the valve always has less torque.

Self-tight pressure sealing structure

The valve packing adopts the combination of knitting graphite, flexible graphite packing and the middle packing sleeve. It has a good sealing performance and a certain intensity to ensure the valve without external leakage and in line with environmental requirements.
The connection of body and bonnet uses pressure seal self-tight structure, wedge-shaped sealing ring( mild steel or stainless steel) and four open-loop combination. The corresponding body parts are hard surfacing and tight, forcing sealing ring to achieve a reliable seal in the high temperature. The higher pressure, the more reliable seal.

Whole forged stem top

Pressure self-tight seal gate valve is suitable for high temperature, high pressure conditions, but due to medium temperature instability, it may lead to a certain degree of temperature, and the disc may clamp easily. The tensile strength of whole forged stem top is high, and increasing tension when disc is clamping will not make the top fracture, and will not cause the consequence that the disc does not work because of falling into the body.

Whole forged flexible disc, welding seat

The disc is whole-forged. Through the mechanical processing, it forms a unique structural flexible disc. The disc has good strength, and a certain degree of flexibility, and has its obvious advantages in the more complex operating conditions. The disc is hard and tight butt welding. The sealing face has a certain degree of wear allowance in the factory, after a period of using time,the sealing face is wear and tear, the disc declines naturally but still full contact with the seat sealing face to ensure the valve’s normal use.
Seat is welded, uses the suitable welding rod or wire, through heat treatment before welding and after welding, they can be directly welded to the body, in order to achieve the replacement of the valve seat.

Design and manufacture standard

design and manufacture：API600　API6D　GB12234
flange dimension：ANSIB16.5　JB/T79　GB9113
pressure teperature：ANSIB16.34　JB/T74　GB9131
face to face dimension：ANSIB16.10　GB12221
inspection and test：API598　JB/T9092　GB13927

Dimensions & constructral diagram

Installation dimensions and weight

ANSI 900、1500、2500Lb
	ANSI 900Lb					ANSI 1500Lb					ANSI 2500Lb
NPS	2	3	4	6	8	2	3	4	6	8	2	3	4	6
L	368	381	457	610	737	368	470	546	705	832	451	368	457	610
H	520	650	750	800	940	615	705	925	1190	1525	520	735	890	1145
D。	250	350	450	500	600	250	350	450	600	710	350	450	600	750
Wt	59	115	198	303	407	116	209	296	720	1257	75	115	215	580
★	200	450	600	1000	1200	200	450	600	1000	1500	450	750	1500	1800
GB 16.0、25.0MPa
	GB 16.0MPa							GB 25.0MPa
DN	50	80	100	150		200		50	80		100	150	200
L	300	390	450	600		750		350	470		550	750	832
H	510	585	630	820		990		496	575		660	790	830
D。	360	400	450	640		720		360	400		560	600	720
Wt	73	141	185	462		711		66	123		236	-	-
★	200	450	600	1000		1200		300	650		1200	1200	1500

Note: H, Wt are the data for the handwheel. ★ is reference torque of bevel gear and electric devices,the unit is NM.

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