Product Description

The high temperature and high pressure welded gate valve is a national standard type that follows the JB/T3595 standard. The middle part adopts pressure self-tightening type without bonnet, which has good sealing performance under high temperature and high pressure conditions. There are two materials for the self-sealing ring, one is mild steel, and the other is flexible graphite 316 wire (mesh). The upper layer of the sealing surface is welded drill-base cemented carbide, and the processed pure metal layer is ≥3mm, which has wear resistance, high temperature resistance, corrosion resistance, scratch resistance and long service life. Both ends of the branch pipe are welded structure, and the welding groove can be made according to the standard or user requirements. The valve is suitable for high temperature and high pressure water, steam, oil, superheated steam pipelines in thermal power plants, petrochemicals, metallurgy, etc.

Product Features

1. The shell adopts two process options of forging and casting, with smooth appearance and uniform structure, which meets the requirements of high temperature and high pressure; a full range of full forged steel gate valves can be provided according to user needs;2. Pairing of special materials to ensure high hardness and poor hardness of the sealing surface; precision grinding, as smooth as a mirror, wear-resistant and corrosion-resistant, effectively prolonging the service life;3. The back sealing design can effectively protect the sealing packing and prevent leakage and leakage;4. Multi-channel testing such as high-pressure water strength, high-pressure gas strength, non-destructive testing, etc., comprehensively control the quality of pressure-bearing parts;5. The surface of the valve stem is precision ground and hardened, which is scratch-resistant and corrosion-resistant, effectively reducing the opening and closing torque, and the operation is easier;6. The special corrosion-inhibiting packing structure design is adopted, which is resistant to temperature and pressure, no corrosion, automatic lubrication, reduces the friction of opening and closing, avoids corrosion on the surface of the valve stem, and thus avoids external leakage;7. The two-way pressure-bearing seal design meets the harsh requirements of various special working conditions.

The main technical parameters

PN	Strength test(MPa)	Seal test(MPa)	Proper temperature℃	Applicable media
16.0	37.5	27.5	≤425	Water, steam, oil
32.0	48.0	35.2	≤425
P54/100V	30	11	≤540
P54/140V	42	15.4
P54/170V	48	18.7

Material of main parts

1	Body	WCB-A105、WC6-12Cr1MoV、WC9-12Cr1MoV
2	Plate	WCB、WC6、WC9
3	Stem	2Cr13、25Cr2MoV、20Cr1Mo1V1A
4	Bonnet	WCB-35、WC6-12Cr1MoV、WC9-12Cr1MoV
5	Platen	2Cr13、25Cr2MoV、20Cr1Mo1V1A
6	Packing	Reinforced flexible graphite, V-type PTFE packing
7	Gland	1Cr13、WCB、CF8、CF3、CF8M、CF3M
8	Bracket	WCB、WC6、WC9

Main external connection dimensions

Nominal pressurePN（MPa）	Nominal diameterDN（mm）	Standard value			Reference value
		L	D1	D2	H
Z462H/Y Z562H/Y PN16.0 PN20.0 P54/100V	125	600	138	172	1402
	150	650	160	200	1129
	175	750	181	223	1250
	200	800	202	250	1450
	225	850	232	278	1650
	250	950	275	330	1750
	300	1194	320	382	1950
Z462H/Y Z562H/Y PN25.0 PN32.0 P54/140V P57/170V	125	600	126	172	1402
	150	700	150	200	1408
	175	750	170	223	1650
	200	800	189	250	1650
	225	850	208	278	1750
	250	950	252	330	1850
	300	1194	305	412	2040
	350	1250	353	464	2150