SZXT,SZSTPneumatic thin film piston diaphragm regulating valveDetailed product description：

SZXT and SZST pneumatic diaphragm and piston type diaphragm regulating valves (referred to as pneumatic diaphragm valves) use a "mountain" shaped protruding surface between the diaphragm and the valve body for sealing, isolating them from the outside world (without a packing box). The valve body flow path is simple, smooth, and can be covered with an anti-corrosion layer, making it particularly suitable for applications that require corrosion resistance and high toxicity.

This series of products has nominal pressure ratings of 0.6 and 1.0 MPa, with valve body diameters ranging from 20 to 200 mm. They are suitable for temperatures up to 150 ℃ and have zero leakage

Product Features
The ZXT model adopts a multi spring actuator, which can reduce both height and weight by 30%.
The surface of the valve body is coated with various materials to avoid direct contact with the medium and withstand the corrosion of highly corrosive media.
When the valve is closed, the internal and external leakage is zero, which is particularly suitable for valve sections with highly toxic media or media that are not allowed to be contaminated.
The flow path is simple, the resistance is low, and the rated flow coefficient is larger than that of a single seat, sleeve regulating valve of the same caliber.

SZXT, SZST Pneumatic Thin Film Piston Diaphragm Control Valve Parts Material

Main component materials: Valve body: HT200, ZG230~450 or above material lining
Diaphragm: Ding Quan rubber, natural rubber, PTFE ripple
Film: Nitrile rubber clip reinforced polyester fabric
Spring: 60S12Mn valve body lining material and applicable scope

Valve body lining	Operating temperature (℃)	Applicable Medium
unlined	-10~+175	Suitable for non corrosive media
soft rubber	-10~+85	Has excellent wear resistance and is suitable for cement, clay, coal dust, dry fertilizers, etc
Hard rubber	-10~+85	Suitable for non mechanical, salt, hydrochloric acid, metal plating solution, soft water, chloride, chlorine gas, etc
neoprene	-10~+105	Suitable for corrosive mud with a wide range of pH values in animal oil, vegetable oil, and lubricating oil. Good anti-wear performance
Ding Quan Jiao	-10~+120	Good anti-corrosion and wear resistance, with the best corrosion resistance to most inorganic acids and acidic mortars
enamel	-10~+175	Suitable for compounds such as warm inorganic acids, oxidizing acids, halogens, alcohols, esters, etc
Fluorine 46	-10~+190	Suitable for strong corrosive media such as sulfuric acid, hydrochloric acid, sodium hydroxide, etc

Diaphragm material and scope of application

Diaphragm material	Operating temperature (℃)	Applicable Medium
Ding Quan glue (Grade B)	-40~+100	Most inorganic acids such as sulfuric acid, hydrofluoric acid, phosphoric acid, etc. are suitable for good corrosion resistance, while various bases and salts
Natural rubber (Q-grade)	-50~+100	Mainly used as a mineral acid medium for purifying water, inorganic salts, and olefins
Polytetrafluoroethylene	-10~+150	Excellent chemical stability, corrosion resistance to strong acids, concentrated alkalis, and strong oxidants

Main technical parameters

Nominal diameter DN (mm)

twenty

twenty-five

thirty-two

forty

fifty

sixty-five

eighty

one hundred

one hundred and twenty-five

one hundred and fifty

two hundred

Rated flow coefficient Kv

unlined

nine point eight

nineteen

thirty-two

forty-eight

sixty-three

one hundred and eight

one hundred and fifty-eight

two hundred and seventy

three hundred and sixty

five hundred and eighteen

one thousand one hundred and fourteen

With lining

seven point eight

seventeen

twenty-eight

forty-one

fifty-five

eighty-seven

one hundred and twenty-seven

two hundred and forty

three hundred and eleven

four hundred and fifteen

one thousand one hundred and twenty-one

Rated travel L (mm)

eight

ten

twelve

sixteen

twenty-four

thirty

thirty-four

thirty-six

forty-four

fifty-five

sixty-five

Effective area of membrane Ae (cm2)

two hundred and eighty

four hundred

six hundred

one thousand

Piston diameter (mm)

one hundred

one hundred and twenty-five

one hundred and sixty

two hundred and fifty

Nominal pressure PN (MPa)

0.6 1.0

Inherent flow characteristics

Approximately equal percentage

Working temperature (℃)

≤150

Signal range Pr (KPa)

20~100, 40~200, 400~600

Allowable leakage amount

Zero leakage within the allowable pressure difference range

The actuators listed in the table are standard configurations and can be selected according to process requirements.

Installation Notes
Flange standard: Cast iron flange according to GB4216-84
Cast steel flange according to GB9113-88
Flange sealing surface type: convex surface
Pneumatic signal connector for actuator: Internal thread M16 × 1.5
Structural length: GB12221-89
The distance between the valve body flange end face and the flange standard can also be manufactured according to user specified standards such as ANSI, JIS, DIN, etc