food vacuum box with motor control

#include <Wire.h>
#include <Adafruit_BMP085.h>
#include <AFMotor.h>

AF_DCMotor pump(1);
AF_DCMotor valve(4);
AF_DCMotor openvalve(3);


Adafruit_BMP085 bmp;
// VCC -> 3.3V
// GND -> GND
// SCL -> Analog 5
// SDA -> Analog 4

int pushButton = 9;
int pumpRelay = 10;

double vacuum = 960.0; //at this pressure we got vacuum
double safety = 20.0;  //safety range for pressure

bool openbox = false;
bool pressurereached = false;

void setup() {

  pinMode(pushButton, INPUT);
  pinMode(pumpRelay, OUTPUT);
  valve.run(RELEASE);
  valve.setSpeed(255);
  openvalve.run(RELEASE);
  openvalve.setSpeed(255);
  pump.run(RELEASE);
  pump.setSpeed(255);

  Serial.begin(9600);
  Serial.println("Reading pressure");
  if (!bmp.begin()) {
    Serial.println("Could not find a valid BMP085 sensor, check wiring!");
  delay(1000);
    while (1) {}
  }
}

void loop() {
    Serial.print("Temperature = ");
    Serial.print(bmp.readTemperature());
    Serial.println(" *C");

    double pressure = (bmp.readPressure()/100); //hPa
    Serial.print("Pressure = ");
    Serial.print(pressure);
    Serial.println(" Pa");

    delay(500);

    if (digitalRead(pushButton) == HIGH) {
      openbox = false;
      if (pressure > vacuum) pressurereached = false;
      if (!pressurereached){
      openvalve.run(RELEASE);
      valve.run(FORWARD);
      pump.run(FORWARD);
      delay(500);
      digitalWrite(pumpRelay, HIGH);

      while (pressure > vacuum && digitalRead(pushButton) == HIGH) {
        pressure = (bmp.readPressure()/100)+safety; //we will actually get to (960-20)=940 hPa before stopping
        Serial.print("Pressure = ");
        Serial.print(pressure);
        Serial.println(" Pa");
        delay(1000);
      }
      Serial.println("Stop");
      pump.run(RELEASE);
      digitalWrite(pumpRelay, LOW);
      valve.run(RELEASE);
      pressurereached = true;
      }
      delay(5000);
    } else {
      digitalWrite(pumpRelay, LOW);
      pump.run(RELEASE);
      valve.run(RELEASE);
      if (!openbox) openvalve.run(FORWARD);
      int i = 0;
      while (i < 20 && digitalRead(pushButton) == LOW) {
      delay(1000);
      i++;
      }
      openvalve.run(RELEASE);
      openbox = true;
    }

}