870G Small caliber high pressure regulating valve

Technical Parameters Structure and materials Specification parameter Quality Assurance

870G Top guide type high pressure regulating valve, adopting sleeve guide, pressure balance type valve core. The valve is mainly applicable to the working pressure, flashing, cavitation. The valve structure can be designed to diversify the caliber from DN20 ~ dn200mm, pressure range design maximum 2500lb, equipped with a variety of specifications of the electric actuator.

Product features
According to the different design parameters of a number of different antihypertensive cage sets of components in a multistage depressed, according to different design condition of the cages to ensure valve to eliminate the flashing, cavitation phenomenon. Medium from the first contact cage set began throttling, through multiple throttle will import the high differential pressure gradually lower down, so effectively ensures the medium in the valve flow, the pressure is always in the saturation vapor pressure above, which eliminate the may produce flash, cavitation phenomenon, prolonged the service life of the valve regulating the adverse condition.

Design features
Continuous regulation in the range of high pressure difference
Multi stage decompression, anti cavitation, low noise
The valve cone seal, the sealing effect is good
Multiple design of valve core, the adjustment performance is good
Valve seat spray welding hard alloy, corrosion resistance, long life
The spool with guiding structure, Anti balance
The actuator mounted interchangeable

Technical parameters
Body form：Straight through type forging valve body
Spool form：Multi stage throttle valve core
Nominal diameter：DN20~200 NPS 3/4"~ 8"
Nominal pressure：PN10.0～42.0MPa；CALSS 600～900 LB
Applicable temperature：-196～+650℃（Optional）
Connection form：Flange, welding, screw thread
Flange distance：Meet IEC 60534
Gland form：Bolt pressing type
Sealing gasket：Saw tooth type metal gasket
Seal up：PTFE, Flexible graphite
Actuator：Pneumatic actuator, electric actuator

Structure and materials


1	底座Base	A105	304	316	316L
2	墊片Shim	鋸齒型金屬墊片Saw tooth type metal gasket、金屬石墨墊片Metal graphite gasket
3	閥體Body	A105	304	316	316L
4	導(dǎo)向桿Guide rod	304	304	316	316L
5	導(dǎo)向套Guide sleeve	304	304	316	316L
6	閥芯Seat	304	304	316	316L
7	墊片Shim	鋸齒型金屬墊片Saw tooth type metal gasket、金屬石墨墊片Metal graphite gasket
8	螺絲螺母Screw nu	304	304	316	316L
9	閥蓋Valve cover	A105	304	316	316L
10	填料Packing	聚四氟乙烯PTFE、柔性石墨Flexible graphite
11	鎖緊螺母Lock nut	304	304	316	316L
12	壓套Pressing ring	304	304	316	316L
13	壓板Plate	304	304	316	316L

Executing agency

Model Form	Pneumatic actuator	Electronic electric actuator
	ZH23～ZH56	3810L RSL
	Multi spring type	Intelligent integration
Use	Regulating、Switch	Regulating
Drive	pressure（range of spring） 140（20～100）Kpa G 240（40～200）Kpa G 280（80～240）Kpa G	Power Supply： AC 220 V ±10% 50Hz Power Supply： AC 380 V ±10% 50Hz
Joint	Rc 1/4	Popular type： 2-PF （G1/2"） Explosion proof type： 2-PF （G3/4"）
Positive effect	Air pressure increase to drive the valve close	Control signal increase to drive the valve close
Reaction	Air pressure increase to drive the valve open	Control signal increase to drive the valve open
Control signal	4～20mA.DC（Tape locator）	Input output 4～20mA.DC
Hysteresis	≤ 1% FS （Tape locator）	≤ 0.8% FS
Linearity	2% FS （Tape locator）	≤ ±1% FS
Temperature	-10～+70℃
Surface coating	Body：Black phosphating treatment Actuator：acrylic polyurethane enamel
Optional accessories	Valve positioner Handwheel Solenoid valve Travel switch Position valve	Heater

Performance

Flow characteristics		Equal percentage、Straight line
Adjustable range		50:1
Rated Cv value		The percentage etc：5～300
Allowable leakage		Metallic seal：III (0.5% valve rated flow)；soft seal: v
Performance index	Driving mode	Pneumatic	Electric
	Intrinsic error %	± 1.0	± 1.0
	Return difference %	≤ 1.0	≤ 1.0
	Dead zone %	≤ 0.6	≤ 1.0
	Switch deviation %	± 2.5	± 2.5
	Deviation of stroke %	≤ 2.5	≤ 2.5

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