ZMAP-16D type pneumatic low-temperature regulating valveDetailed product description：

Pneumatic thin film low-temperature regulating valve is a modified product of single and double seat regulating valves. It differs from the ambient temperature regulating valve in that it uses a long necked upper valve cover to keep the packing working at room temperature. Suitable for regulating media (such as liquid oxygen, liquid nitrogen, etc.) at low temperatures ranging from -60 to -250 ℃. To ensure adjustment accuracy, a valve positioner must be used.

structural principle
The pneumatic low-temperature regulating valve consists of two parts: a pneumatic diaphragm actuator and low-temperature resistant single and double seat valves. The signal pressure from the regulator is input into the air chamber of the pneumatic diaphragm actuator, generating thrust. The valve core is driven by the connecting rod, and the change in the position of the valve core changes the flow cross-sectional area of the valve, achieving the regulation of the medium flow rate.

Main technical indicators

Nominal Diameter DN

single-seat

twenty

twenty-five

thirty-two

forty

fifty

sixty-five

eighty

one hundred

one hundred and twenty-five

one hundred and fifty

two hundred

Double seat

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

single-seat

zero point zero eight

zero point one two

zero point two zero

zero point three two

zero point five zero

zero point eight zero

one point two

two

three point two

five

eight

twelve

twenty

thirty-two

fifty

eighty

one hundred and twenty

two hundred

two hundred and eighty

four hundred and fifty

Double seat

ten

six

twenty-five

forty

sixty-three

one hundred

one hundred and sixty

two hundred and fifty

four hundred

six hundred and thirty

flow characteristics

straight line

Straight line; equal percentage

Equipped with actuator model

ZMA-2

ZMA-3

ZMA-4

ZMA-5

itinerary

ten

ten

sixteen

twenty-five

forty

sixty

mode of action

Airtight (B), Airtight (K)

Spring pressure range KPa

Standard signal: 20-100; Other signals; 40～200； 20～60； 60~100

Installation and usage precautions
1. It should be installed vertically on a horizontal pipeline. In special cases where horizontal or inclined installation is required, support should generally be added. The circular board installed on the insulation box wall should be parallel to the insulation box wall.
2. It should be installed near the ground or floor for maintenance and repair purposes. For those equipped with valve positioners or handwheel mechanisms, it is even more important to ensure easy observation, adjustment, and operation.
3. Generally, a bypass pipeline is set up to switch to manual operation in case of automatic control system failure or maintenance of regulating valves, so as not to stop production.
4. When equipped with a handwheel mechanism, manual operation of the bypass pipeline can also be omitted, and it can also be used to limit the opening of the valve. When stopped, the handwheel mechanism must be restored to its original neutral position to facilitate the normal operation of the self-control system.
5. During installation, the flow direction of the medium should be consistent with the direction indicated on the valve body.
6. Before installing the regulating valve, the pipeline should be cleaned of dirt and welding slag. After installation, fully open the regulating valve, clean the pipelines, valves, etc., and test the sealing of each connection.

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

A

two hundred and thirty

two hundred and eighty

two hundred and eighty

three hundred and twenty-five

four hundred and ten

four hundred and ninety-five

one hundred and thirty-five

two hundred and thirty-five

two hundred and thirty-five

two hundred and fifty-five

two hundred and eighty

three hundred and ten

three hundred and forty-five

three hundred and seventy

four hundred and thirty

four hundred and seventy

five hundred and fifty

six hundred and sixty

one

one hundred and sixty

two hundred and sixty

two hundred and sixty

two hundred and eighty-five

three hundred and five

three hundred and forty

three hundred and seventy-five

four hundred and five

four hundred and sixty

five hundred and twenty-five

five hundred and ninety

seven hundred

two

one hundred and ninety

two hundred and ninety

two hundred and ninety

three hundred and fifteen

three hundred and thirty-five

three hundred and seventy

four hundred and ten

four hundred and forty

four hundred and ninety

five hundred and sixty

six hundred and thirty

seven hundred and forty

n-

6-12

8-14

8-14

8-14

8-16

10-16

10-18

12-18

16-18

20-18

single-seat

H

L

one hundred and twenty

one hundred and ninety

two hundred

two hundred and ten

two hundred and thirty-five

two hundred and sixty-five

two hundred and ninety-five

two hundred and ten

three hundred and seventy

four hundred and forty

four hundred and seventy-five

five hundred and seventy

H1=500

eight hundred and sixty-two

one thousand and six

one thousand and sixty

one thousand and sixty-six

one thousand one hundred and thirty-seven

one thousand one hundred and fifty-two

one thousand three hundred and seventy-seven

one thousand three hundred and ninety

one thousand three hundred and ninety-four

H1=600

nine hundred and sixty-two

one thousand one hundred and six

one thousand one hundred and sixty

one thousand one hundred and sixty-six

one thousand two hundred and thirty-seven

one thousand two hundred and fifty-two

one thousand four hundred and seventy-seven

one thousand four hundred and ninety

one thousand four hundred and ninety-four

H1=700

one thousand and sixty-two

one thousand two hundred and six

one thousand two hundred and sixty

one thousand two hundred and sixty-six

one thousand three hundred and thirty-seven

one thousand three hundred and fifty-two

one thousand five hundred and seventy-seven

one thousand five hundred and ninety

one thousand five hundred and ninety-four

one thousand seven hundred and forty-three

one thousand seven hundred and fifty-one

one thousand seven hundred and ninety

H1=800

one thousand one hundred and sixty-two

one thousand three hundred and six

one thousand three hundred and sixty

one thousand three hundred and sixty-six

one thousand four hundred and thirty-seven

one thousand four hundred and fifty-two

one thousand six hundred and seventy-seven

one thousand six hundred and ninety

one thousand six hundred and ninety-four

one thousand eight hundred and forty-three

one thousand eight hundred and fifty-one

one thousand eight hundred and ninety

H1=900

one thousand two hundred and sixty-two

one thousand four hundred and six

one thousand four hundred and sixty

one thousand four hundred and sixty-six

one thousand five hundred and thirty-seven

one thousand five hundred and fifty-two

one thousand seven hundred and seventy-seven

one thousand seven hundred and ninety

one thousand seven hundred and ninety-four

one thousand nine hundred and forty-three

one thousand nine hundred and fifty-one

one thousand nine hundred and ninety

H1=1000

one thousand three hundred and sixty-two

one thousand five hundred and six

one thousand five hundred and sixty

one thousand five hundred and sixty-six

one thousand six hundred and thirty-seven

one thousand six hundred and fifty-two

one thousand eight hundred and seventy-seven

one thousand eight hundred and ninety

one thousand eight hundred and ninety-four

two thousand and forty-three

two thousand and fifty-one

two thousand and ninety

H1=1100

two thousand one hundred and forty-three

two thousand one hundred and fifty

two thousand one hundred and ninety

H1=1200

two thousand two hundred and forty-three

two thousand two hundred and fifty

two thousand two hundred and ninety

H2

thirty-two

fifty-eight

one hundred and twelve

one hundred and eighteen

one hundred and twenty-nine

one hundred and forty-four

one hundred and seventy-eight

one hundred and ninety-one

one hundred and ninety-five

two hundred and forty-three

two hundred and fifty-one

two hundred and ninety

Double seat

H

L

two hundred

two hundred and ten

two hundred and thirty-five

two hundred and sixty-five

two hundred and ninety-five

three hundred and twenty

three hundred and seventy

four hundred and forty

four hundred and seventy-five

five hundred and seventy

H1=500

one thousand and sixty-five

one thousand and sixty-eight

one thousand one hundred and forty-seven

one thousand one hundred and fifty-two

one thousand three hundred and eighty-seven

one thousand four hundred and seven

one thousand four hundred and nineteen

H1=600

one thousand one hundred and sixty-five

one thousand one hundred and sixty-eight

one thousand two hundred and forty-seven

one thousand two hundred and fifty-two

one thousand four hundred and eighty-seven

one thousand five hundred and seven

one thousand five hundred and nineteen

H1=700

one thousand two hundred and sixty-five

one thousand two hundred and sixty-eight

one thousand three hundred and forty-seven

one thousand three hundred and fifty-two

one thousand five hundred and eighty-seven

one thousand six hundred and seven

one thousand six hundred and nineteen

one thousand seven hundred and sixty-eight

one thousand seven hundred and seventy-eight

one thousand eight hundred and twenty

H1=800

one thousand three hundred and sixty-five

one thousand three hundred and sixty-eight

one thousand four hundred and forty-seven

one thousand four hundred and fifty-two

one thousand six hundred and eighty-seven

one thousand six hundred and seven

one thousand seven hundred and nineteen

one thousand eight hundred and sixty-eight

one thousand eight hundred and seventy-eight

one thousand nine hundred and twenty

H1=900

one thousand four hundred and sixty-five

one thousand four hundred and sixty-eight

one thousand five hundred and forty-seven

one thousand five hundred and fifty-two

one thousand seven hundred and eighty-seven

one thousand eight hundred and seven

one thousand eight hundred and nineteen

one thousand nine hundred and sixty-eight

one thousand nine hundred and seventy-eight

two thousand and twenty

H1=1000

one thousand five hundred and sixty-five

one thousand five hundred and sixty-eight

one thousand six hundred and forty-seven

one thousand six hundred and fifty-two

one thousand eight hundred and eighty-seven

one thousand nine hundred and seven

one thousand nine hundred and nineteen

two thousand and sixty-eight

two thousand and seventy-eight

two thousand one hundred and twenty

H1=1100

two thousand one hundred and sixty-eight

two thousand one hundred and seventy-eight

two thousand two hundred and twenty

H1=1200

two thousand two hundred and sixty-eight

two thousand two hundred and seventy-eight

two thousand three hundred and twenty

H2

one hundred and seventeen

one hundred and twenty

one hundred and thirty-nine

one hundred and forty-four

one hundred and eighty-eight

two hundred and eight

two hundred and eight

two hundred and sixty-eight

two hundred and seventy-eight

three hundred and twenty